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Bridge Inspection Practices (2007)

Chapter: Appendix F - Details for Inspection Types and Intervals

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Suggested Citation:"Appendix F - Details for Inspection Types and Intervals." National Academies of Sciences, Engineering, and Medicine. 2007. Bridge Inspection Practices. Washington, DC: The National Academies Press. doi: 10.17226/14127.
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Suggested Citation:"Appendix F - Details for Inspection Types and Intervals." National Academies of Sciences, Engineering, and Medicine. 2007. Bridge Inspection Practices. Washington, DC: The National Academies Press. doi: 10.17226/14127.
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Suggested Citation:"Appendix F - Details for Inspection Types and Intervals." National Academies of Sciences, Engineering, and Medicine. 2007. Bridge Inspection Practices. Washington, DC: The National Academies Press. doi: 10.17226/14127.
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Suggested Citation:"Appendix F - Details for Inspection Types and Intervals." National Academies of Sciences, Engineering, and Medicine. 2007. Bridge Inspection Practices. Washington, DC: The National Academies Press. doi: 10.17226/14127.
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Suggested Citation:"Appendix F - Details for Inspection Types and Intervals." National Academies of Sciences, Engineering, and Medicine. 2007. Bridge Inspection Practices. Washington, DC: The National Academies Press. doi: 10.17226/14127.
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Suggested Citation:"Appendix F - Details for Inspection Types and Intervals." National Academies of Sciences, Engineering, and Medicine. 2007. Bridge Inspection Practices. Washington, DC: The National Academies Press. doi: 10.17226/14127.
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Suggested Citation:"Appendix F - Details for Inspection Types and Intervals." National Academies of Sciences, Engineering, and Medicine. 2007. Bridge Inspection Practices. Washington, DC: The National Academies Press. doi: 10.17226/14127.
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Suggested Citation:"Appendix F - Details for Inspection Types and Intervals." National Academies of Sciences, Engineering, and Medicine. 2007. Bridge Inspection Practices. Washington, DC: The National Academies Press. doi: 10.17226/14127.
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Suggested Citation:"Appendix F - Details for Inspection Types and Intervals." National Academies of Sciences, Engineering, and Medicine. 2007. Bridge Inspection Practices. Washington, DC: The National Academies Press. doi: 10.17226/14127.
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Suggested Citation:"Appendix F - Details for Inspection Types and Intervals." National Academies of Sciences, Engineering, and Medicine. 2007. Bridge Inspection Practices. Washington, DC: The National Academies Press. doi: 10.17226/14127.
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Suggested Citation:"Appendix F - Details for Inspection Types and Intervals." National Academies of Sciences, Engineering, and Medicine. 2007. Bridge Inspection Practices. Washington, DC: The National Academies Press. doi: 10.17226/14127.
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Suggested Citation:"Appendix F - Details for Inspection Types and Intervals." National Academies of Sciences, Engineering, and Medicine. 2007. Bridge Inspection Practices. Washington, DC: The National Academies Press. doi: 10.17226/14127.
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Suggested Citation:"Appendix F - Details for Inspection Types and Intervals." National Academies of Sciences, Engineering, and Medicine. 2007. Bridge Inspection Practices. Washington, DC: The National Academies Press. doi: 10.17226/14127.
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Suggested Citation:"Appendix F - Details for Inspection Types and Intervals." National Academies of Sciences, Engineering, and Medicine. 2007. Bridge Inspection Practices. Washington, DC: The National Academies Press. doi: 10.17226/14127.
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Suggested Citation:"Appendix F - Details for Inspection Types and Intervals." National Academies of Sciences, Engineering, and Medicine. 2007. Bridge Inspection Practices. Washington, DC: The National Academies Press. doi: 10.17226/14127.
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Suggested Citation:"Appendix F - Details for Inspection Types and Intervals." National Academies of Sciences, Engineering, and Medicine. 2007. Bridge Inspection Practices. Washington, DC: The National Academies Press. doi: 10.17226/14127.
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Suggested Citation:"Appendix F - Details for Inspection Types and Intervals." National Academies of Sciences, Engineering, and Medicine. 2007. Bridge Inspection Practices. Washington, DC: The National Academies Press. doi: 10.17226/14127.
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Suggested Citation:"Appendix F - Details for Inspection Types and Intervals." National Academies of Sciences, Engineering, and Medicine. 2007. Bridge Inspection Practices. Washington, DC: The National Academies Press. doi: 10.17226/14127.
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Suggested Citation:"Appendix F - Details for Inspection Types and Intervals." National Academies of Sciences, Engineering, and Medicine. 2007. Bridge Inspection Practices. Washington, DC: The National Academies Press. doi: 10.17226/14127.
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Suggested Citation:"Appendix F - Details for Inspection Types and Intervals." National Academies of Sciences, Engineering, and Medicine. 2007. Bridge Inspection Practices. Washington, DC: The National Academies Press. doi: 10.17226/14127.
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Suggested Citation:"Appendix F - Details for Inspection Types and Intervals." National Academies of Sciences, Engineering, and Medicine. 2007. Bridge Inspection Practices. Washington, DC: The National Academies Press. doi: 10.17226/14127.
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Suggested Citation:"Appendix F - Details for Inspection Types and Intervals." National Academies of Sciences, Engineering, and Medicine. 2007. Bridge Inspection Practices. Washington, DC: The National Academies Press. doi: 10.17226/14127.
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Suggested Citation:"Appendix F - Details for Inspection Types and Intervals." National Academies of Sciences, Engineering, and Medicine. 2007. Bridge Inspection Practices. Washington, DC: The National Academies Press. doi: 10.17226/14127.
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Suggested Citation:"Appendix F - Details for Inspection Types and Intervals." National Academies of Sciences, Engineering, and Medicine. 2007. Bridge Inspection Practices. Washington, DC: The National Academies Press. doi: 10.17226/14127.
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145 APPENDIX F Details for Inspection Types and Intervals Bridges and Culverts Routine Inspection Interval, Months DOT <12 12 24 36 48 Alabama 242 2,532 12,913 0 16 Alaska 0 1 1,177 0 0 Arizona 0 37 3,963 0 3,206 Arkansas 6 1,942 9,928 0 606 California 47 52 23,907 0 17 Colorado 10 71 7,012 0 1,185 Connecticut 16 19 3,897 0 236 Delaware 2 15 834 1 0 Dist. of Columbia 0 0 244 0 0 Florida 60 383 11,091 0 0 Georgia 7 20 14,492 0 1 Hawaii 1 15 1,090 0 0 Idaho 0 614 3,448 0 10 Illinois 2 529 14,392 0 10,883 Indiana 2 3 18,269 0 0 Iowa 16 1,251 23,586 0 0 Kansas 25 2,105 23,183 0 3 Kentucky 49 1,374 9,808 0 2,291 Louisiana 62 1,129 12,160 0 0 Maine 0 43 2,322 0 5 Maryland 10 376 4,685 0 12 Massachusetts 139 377 4,402 0 0 Michigan 145 240 10,233 0 1 Minnesota 4 3,721 9,294 15 0 Mississippi 56 1,822 14,933 0 93 Missouri 0 1,409 22,468 0 2 Montana 2 7 4,074 0 846 Nebraska 0 173 15,281 0 0 Nevada 5 30 1,598 0 1 New Hampshire 148 222 2,001 0 0 New Jersey 1 3 6,437 0 3 New Mexico 4 217 2,276 0 1,322 New York 3 1,361 15,978 0 0 North Carolina 2 3 17,497 0 0 North Dakota 2 44 3,980 0 452 Ohio 41 28,019 5 0 0 Oklahoma 33 1,085 21,934 0 335 Oregon 14 300 6,924 0 13 Pennsylvania 190 1,652 20,361 0 4 Puerto Rico 8 42 1,978 0 0 Rhode Island 2 118 629 0 0 South Carolina 2 2,793 6,408 0 0 South Dakota 2 44 5,473 0 441 Tennessee 0 5 19,724 0 31 Texas 98 225 44,297 0 4,598 Utah 1 5 2,822 0 0 Vermont 0 52 2,651 0 0 Virginia 37 2,169 11,032 0 8 Washington 14 506 6,706 2 414 West Virginia 70 951 4,205 0 1,688 Wisconsin 48 54 13,589 0 0 Wyoming 1 203 2,822 1 2 Total 1,629 60,363 504,413 19 28,275 Source: 2005 NBI data (2). Note: Not all inspection intervals are shown. TABLE F1 INSPECTION INTERVALS—ROUTINE INSPECTION

146 Bridges and Culverts Total Underwater Inspection Interval, Months DOT Inspections <12 12 24 36 48 60 72 >72 Alabama 945 0 19 613 0 297 16 0 0 Alaska 175 0 0 9 0 0 166 0 0 Arizona 12 1 4 1 0 0 3 3 0 Arkansas 7,536 3 260 1,064 28 5,227 954 0 0 California 638 0 1 6 1 26 603 0 0 Colorado 75 5 1 6 1 0 62 0 0 Connecticut 309 4 5 294 0 6 0 0 0 Delaware 77 0 1 1 0 4 71 0 0 Dist. of Columbia 13 1 0 6 0 0 6 0 0 Florida 3,950 37 165 3,735 0 1 1 0 0 Georgia 2,170 0 0 2 0 38 2,130 0 0 Hawaii 102 3 0 2 0 0 97 0 0 Idaho 306 0 5 1 0 1 299 0 0 Illinois 1,293 0 340 401 5 46 501 0 0 Indiana 710 1 9 36 14 180 470 0 0 Iowa 144 19 3 18 0 5 97 0 0 Kansas 201 1 2 14 1 41 142 0 0 Kentucky 2,147 2,015 1 2 0 21 107 0 0 Louisiana 1,198 27 54 260 0 0 856 0 0 Maine 371 0 4 28 0 1 338 0 0 Maryland 421 0 1 2 0 357 61 0 0 Massachusetts 756 0 46 40 556 56 44 0 0 Michigan 353 43 2 79 1 17 208 0 0 Minnesota 338 0 0 0 0 1 337 0 0 Mississippi 304 0 0 2 0 0 302 0 0 Missouri 174 0 0 9 2 4 159 0 0 Montana 499 4 0 1 0 364 130 0 0 Nebraska 95 0 0 0 0 0 95 0 0 Nevada 122 0 0 54 0 67 1 0 0 New Hampshire 137 2 1 5 0 2 120 0 0 New Jersey 708 0 1 150 0 516 41 0 0 New Mexico 7 0 0 0 0 0 7 0 0 New York 804 0 0 1 0 0 803 0 0 North Carolina 2,142 0 4 351 0 1,784 3 0 0 North Dakota 38 0 0 0 0 0 37 1 0 Ohio 290 8 5 8 9 1 257 0 2 Oklahoma 71 0 0 1 0 0 70 0 0 Oregon 676 16 72 128 0 392 68 0 0 Pennsylvania 3,881 9 81 3,697 5 79 8 0 0 Puerto Rico 30 1 4 14 5 6 0 0 0 Rhode Island 89 0 0 0 0 2 87 0 0 South Carolina 241 0 0 1 0 218 22 0 0 South Dakota 112 0 0 0 0 0 112 0 0 Tennessee 543 0 0 1 0 17 525 0 0 Texas 796 4 11 24 2 2 753 0 0 Utah 78 0 0 3 0 0 75 0 0 Vermont 53 0 1 4 2 44 2 0 0 Virginia 697 0 2 5 0 4 686 0 0 Washington 315 5 3 12 4 6 280 0 0 West Virginia 256 0 6 1 0 1 248 0 0 Wisconsin 276 0 0 0 0 1 275 0 0 Wyoming 61 0 0 0 0 0 61 0 0 Total 37,735 2,209 1,114 11,092 636 9,835 12,796 4 0 Source: 2005 NBI data (2). Note: Not all inspection intervals are shown. TABLE F2 INSPECTION INTERVALS—UNDERWATER INSPECTION

147 Bridges and Culverts Total Fracture Inspection Interval, Months DOT Critical <12 12 24 36 48 >48 Alabama 260 21 94 145 0 0 0 Alaska 103 9 2 53 0 39 0 Arizona 65 10 12 28 0 2 13 Arkansas 347 4 320 23 0 0 0 California 1,007 6 15 978 0 0 8 Colorado 207 32 8 166 0 0 1 Connecticut 169 0 5 164 0 0 0 Delaware 29 1 4 24 0 0 0 Dist. of Columbia 13 1 0 11 0 0 0 Florida 339 2 119 217 0 1 0 Georgia 82 0 81 1 0 0 0 Hawaii 10 2 0 8 0 0 0 Idaho 173 3 91 77 0 1 1 Illinois 550 0 17 453 0 9 71 Indiana 523 12 45 464 0 0 2 Iowa 1,660 16 502 1,140 0 0 2 Kansas 1,109 6 586 383 2 48 78 Kentucky 349 60 3 280 0 0 6 Louisiana 142 3 53 86 0 0 0 Maine 45 0 3 42 0 0 0 Maryland 285 3 52 196 0 0 34 Massachusetts 329 6 2 320 0 0 0 Michigan 105 22 11 31 12 0 0 Minnesota 248 0 0 1 0 84 163 Mississippi 244 0 111 133 0 0 0 Missouri 1,589 0 12 1,576 0 0 0 Montana 310 0 1 309 0 0 0 Nebraska 1,289 1 130 1,158 0 0 0 Nevada 34 7 7 20 0 0 0 New Hampshire 144 25 43 74 0 0 2 New Jersey 652 2 5 639 0 4 1 New Mexico 53 3 47 3 0 0 0 New York 1,777 0 436 1,341 0 0 0 North Carolina 140 0 1 139 0 0 0 North Dakota 239 0 0 5 0 9 225 Ohio 1,099 23 1,026 32 2 0 16 Oklahoma 754 21 348 385 0 0 0 Oregon 347 4 9 322 0 0 12 Pennsylvania 1,896 44 455 1,375 0 12 7 Puerto Rico 22 1 12 6 0 0 0 Rhode Island 35 1 34 0 0 0 0 South Carolina 65 0 37 28 0 0 0 South Dakota 228 0 29 199 0 0 0 Tennessee 271 0 5 263 0 0 0 Texas 624 2 21 232 0 0 369 Utah 62 0 0 62 0 0 0 Vermont 161 0 8 153 0 0 0 Virginia 344 11 287 37 0 6 2 Washington 364 11 4 342 0 0 7 West Virginia 563 6 186 368 0 0 3 Wisconsin 116 1 1 114 0 0 0 Wyoming 97 2 12 10 0 73 0 Total 21,668 384 5,292 14,616 16 288 1,023 Source: 2005 NBI data (2). Note: Not all inspection intervals are shown. TABLE F3 INSPECTION INTERVALS—FRACTURE-CRITICAL INSPECTION

148 DOT Inspection Scope Interval Notes Cross-channel profile Component 24 months Along substructures Vertical clearance Component 24 months Clearance <16 ft Vertical clearance Component 72 months Clearance >16 ft Eastern Federal Lands Vertical clearance Component 72 months Clearance <16 ft, agricultural crossing Missouri Wading Component 24–60 months During routine inspection New Jersey Underwater Type 1 24 months Channel cross section and scour evaluation; no diver New York Fathometer readings along fascias + profiles along substructures Component 24 months Scour documentation for bridges over water Cross-channel profile Component As work load permits Bridge is not scour critical Cross-channel profile Component At next regular inspection Scour critical Cross-channel profile Component 24 months Channel condition (61) 5 or less Cross-channel profile Component 24 months Scour SmartFlag in state 2 or 3 Cross-channel profile Component 48 months Scour code (113) is 3 or U Cross-channel profile Component 48 months Channel condition (61) > 6 Cross-channel profile Component 48 months Scour SmartFlag in state 1 Cross-channel profile Component 120 months Scour code (113) is 4 or greater Cross-channel profile Component 120 months Channel condition (61) > 7 Cross-channel profile Component 120 months Scour SmartFlag not on Timber member boring report Component Immediate Hollow sound, borer or beetle activity, bulging, splits, cracks noted during routine inspection Timber member boring report Component 96 months Structure located west of the Coast Range and in service longer than 20 years Timber member boring report Component 120 months Structure located in western Oregon and in service longer than 25 years Oregon Timber member boring report Component 144 months Structure located east of the Cascades and in service longer than 30 years Pennsylvania Routine, close-up, hands-on Component 72 months Areas without hands-on in other routine inspections, as noted in inspection report Tennessee Cursory—substructure Component 24 months Substructure in shallow water TABLE F4 PERIODIC TASKS IN ROUTINE INSPECTION

149 Connecticut Box beams—Bridges with three or more box beams Component Interior inspection full length for every cycle Interior of box girders Component Enter every inspection UBIV Component 120 months High bridge (>40 ft) Eastern Federal Lands UBIV—Bearings Component 120 months Bearings not fully visible Confined space inspection Component Idaho Reach-all inspection Component 48 months Limited—Not close up Entire 24 months Bridges in good condition and not fracture critical Can replace 1 or 2 cycles of routine inspection; by NBIS team leader Regular—Close-up as needed Entire 48 months For bridges getting limited inspections, but subject to scour Iowa Regular—Close-up as needed Entire 72 months For bridges getting limited inspections Maryland Confined spaces inspection Component New Jersey UBIV Component Snooper inspections New York Access equipment Component Bridge files show need for special equipment during inspection Ohio Access equipment Component Require riggers, divers, or other personnel with special skills Oklahoma Long and tall bridges Component Snooper inspection of “Long and Tall” bridges that are not fracture critical Interior of box girders Component Every cycle Elements visible only from inside Interior of box girders Component Every cycle If signs of active corrosion Interior of box girders Component Every cycle If fatigue cracking is noted Interior of box girders Component 48 months Areas where water is known to puddle Interior of box girders Component 72 months Curve girders subject to out-of- plane distortion Interior of box girders Component 120 months All box girder sections Major bridge inspection Entire Requires climbing or special skills Oregon UBIV Tall bridge requiring UBIV Pennsylvania Access equipment only—A Component Areas needing special access by cranes, lifts, rigging, etc. UBIV = under bridge inspection vehicle; NBIS = National Bridge Inspection Standards. DOT Inspection Scope Interval Notes TABLE F5 ACCESS FOR ROUTINE INSPECTION

150 DOT Inspection Scope Interval Note Special A—Segmental concrete Special B—Cable stayed Special C—Suspension and movable bridges Alabama Special J—Long-span metal culverts and structural plate culverts Alaska Cathodic protection system inspections Component California Special feature—Close up Component Fatigue-prone details that are not fracture critical Florida Cantilever superstructure Component Inspect pin and hanger Fatigue prone Component Fatigue-prone detailsIllinois Pin and hanger Component Pins and hangers in the main load-carrying elements Intermediate fatigue, close-up Component 12, 24, or 36 months Mid-interval inspection for fatigue-vulnerable bridge Pin, hanger Component 60 months Using NDT Iowa Fatigue, close-up Component 72 months Fatigue-vulnerable bridges; not fracture critical; no cracks Segmental, post-tensioned Segmental post-tensioned bridges Michigan Hydraulic engineering Inspections related to hydraulic engineering Montana Pin and hanger Component 48 months Pin and hangar for redundant structure New Jersey Pin and hanger Component Pin and hanger assemblies North Dakota Segmental box bridges Segmental box bridges Ohio Accessories Lighting, fencing, glare screen, splash guard, catwalks, other Oklahoma Electronic distance meter Component Monitor pier movement Major bridge inspection Unusual or complex features Major bridge inspection Inordinate amount of time required Suspension span Suspension bridge Oregon Cable-stayed span Cable-stayed bridge Critical elements Component Critical elements of complex structures may be inspected separately using special equipment or personnel Pennsylvania Prestressed concrete segmental Prestressed concrete segmental bridges Concrete segmental bridge Concrete segmental bridge Rhode Island Tied-arch bridge Tied-arch bridge Suspension bridge Suspension bridge Tennessee Cable-stayed bridge Cable-stayed bridge Texas External post-tensioned tendons External post-tensioned tendons (continued ) TABLE F6 ROUTINE INSPECTION OF STRUCTURE TYPES AND DETAILS

151 DOT Inspection Scope Interval Note Routine 12 months Concrete structure with unknown reinforcing details Pin and hanger Component Pin and hangers Pin and hanger—UT Component During scheduled inspection Redundant structures with new or newly replaced pins Virginia Fatigue prone Component Fatigue-prone details Special feature— High-strength steel High-strength steel Special feature— Pins/hangers, redundant structures Pins/hangers; redundant structure Special feature—Floating bridge 12 months Floating bridge; inspect for water tightness of pontoons Special feature— Segmental bridge 12 months Segmental bridge Special feature— Suspension bridge 12 months Suspension bridge Special feature— Cable-stayed bridge 12 months Cable-stayed bridge Washington Floating bridge— Equipment Component 24 months Electrical and mechanical systems UT = ultrasonic testing. TABLE F6 (Continued) ROUTINE INSPECTION OF STRUCTURE TYPES AND DETAILS

152 DOT Name Location on Component Notes Routine Most routine inspections are hands-on Alabama Special D—Pin and hanger details Close-up inspection of pin and hanger Alaska Routine Extent of hands-on varies as needed Arizona Hands-on Locations identified in report Extent of hands-on varies as needed Arkansas Hands-on Locations identified in report and in database Extent of hands-on varies as needed California Hands-on Electronic notes; not searchable Extent of hands-on varies as needed Hands-on Locations identified in report; excluded areas also noted Extent of hands-on varies as needed Box beams—Curved Box beams—Bridges with one or two box beams Tension members of trusses Welded connections for lateral bracing All nonredundant members Rusted areas of members All bearings Metal deck connections Welds in tension Repaired welds Connecticut 100% hands-on 100% hands-on 100% hands-on 100% hands-on 100% hands-on 100% hands-on 100% hands-on 100% hands-on 100% hands-on 100% hands-on 100% hands-on Fatigue-prone welds Delaware Hands-on Locations identified in report Extent of hands-on varies as needed Hands-on Some post-tensioned structures; every cycle Hands-on Bearings, if accessible Post-tensioned box girders Every square foot must be viewed; use UBIV as required. Hands-on At least some sounding of concrete At least some probing of timber Hands-on Eastern Federal Lands Hands-on Clean and inspect representative area of bearings Florida Locations identified in report Extent of hands-on varies as needed Idaho Hands-on Locations identified in report and in database Extent of hands-on varies as needed Iowa Hands-on Locations identified in report and in database Extent of hands-on varies as needed Kentucky Hands-on Locations identified in report and in database Extent of hands-on varies as needed Maine Hands-on Locations identified in electronic report, not database Extent of hands-on varies as needed Maryland Hands-on Locations identified in report and in database Extent of hands-on varies as needed Michigan Hands-on Locations identified in web-based report Extent of hands-on varies as needed Missouri Hands-on Locations identified in report and in database Extent of hands-on varies as needed (continued ) TABLE F7 ROUTINE, HANDS-ON INSPECTION

153 DOT Name Location on Component Notes Nevada Hands-on Locations identified in report and in database Extent of hands-on varies as needed Tension areas of steel boxes Steel pier caps New Jersey Hands-on Steel two-girder bridges Nonredundant metal superstructure Fracture-critical metal superstructure Stringers within 1 m of connection to floorbeam Pin/hanger + main member within 1 m New York Special emphasis hands-on, 0.5 m Special emphasis hands-on, 0.5 m Special emphasis hands-on, 0.5 m Special emphasis hands-on, 0.5 m Locations identified in report Locations identified in report Locations identified in report Locations identified in report Locations identified in report Locations identified in report Locations identified in report Locations identified in report Locations identified in report Locations identified in report Locations identified in report Locations identified in report Fatigue-vulnerable elements (continued ) Welded backup bars Welded tension areas and stress reversal areas Welded repairs to main members Bearing stools fabricated from welded shapes Splices in multispan through girders Details subject to out-of-plane distortion Concrete deck haunches Steel staggered diaphragms notes Locations identified in report and in database Special emphasis hands-on, 0.5 m Special emphasis hands-on, 0.5 m Special emphasis hands-on, 0.5 m Special emphasis hands-on, 0.5 m Special emphasis hands-on, 0.5 m Special emphasis hands-on, 0.5 m Special emphasis hands-on, 0.5 m Special emphasis hands-on, 0.5 m Locations identified in report Special emphasis hands-on, 0.5 m North Carolina Hands-on Locations identified in report Extent of hands-on varies as needed North Dakota Hands-on Locations identified in electronic report Extent of hands-on varies as needed Ohio Hands-on Locations identified in report and in database Extent of hands-on varies as needed Oregon Hands-on Locations identified in report and electronic Extent of hands-on varies as needed Pennsylvania Hands-on Hands-on Hands-on Hands-on Hands-on Hands-on Hands-on Hands-on Hands-on Hands-on Locations identified in report and in database Locations identified in report and in database Locations identified in report and in database Locations identified in report and in database Locations identified in report and in database Locations identified in report and in database Locations identified in report and in database Locations identified in report and in database Locations identified in report and in database Vulnerable areas, poor condition areas Any component without hands-on inspection in 72 months Load-carrying members in poor condition Fracture-critical member with less than 10 years remaining life Fracture-critical member where displacement-induced fatigue is critical Redundancy retrofit systems (e.g., catcher beams) for fracture-critical details (pin and hangers, etc.) Critical sections of controlling members on posted bridges Scour-critical substructure units End regions of steel girders or beams under deck joint Cantilever portions of concrete piers or bents in fair or lesser condition TABLE F7 (Continued) ROUTINE, HANDS-ON INSPECTION

154 DOT Name Location on Component Notes Routine inspections are hands-on notes UBIV = under bridge inspection vehicle; ADTT = average daily truck traffic. Rhode Island Hands-on All routine inspections are hands-on Tennessee Hands-on Texas Hands-on Locations identified in report Extent of hands-on varies as needed Vermont Hands-on Locations identified in report Extent of hands-on varies as needed Hands-on Locations identified in report Extent of hands-on varies as needed AASHTO fatigue categories D or worse and ADTT 500 or more Virginia Fatigue prone AASHTO fatigue categories D or worse and Interstate route Washington Hands-on Locations identified in report and in electronic notes Most routine inspection is hands-on; extent of hands-on varies as needed West Virginia Hands-on Locations identified in report and in electronic Extent of hands-on varies as needed Locations identified in report and in database Hands-on Hands-on Locations identified in report and in database Ends of prestressed concrete beams at continuity diaphragms Precast concrete bridge parapets TABLE F7 (Continued) ROUTINE, HANDS-ON INSPECTION

155 DOT Name Scope Interval Notes Class I in-depth Entire 120 months max. Team is Lead Inspector and Bridge Inspector; hands-on entire deck soffit In place of hands-on inspection that cycle Senior engineer must be present. Includes stream cross sections; new clearance diagram Class II in-depth Entire 120 months max. Team is Lead Inspector and Bridge Inspector with 25% time of Engineer III for critical parts. Hands-on entire deck soffit In place of hands-on inspection that cycle Senior engineer must be present. Includes stream cross sections; new clearance diagram Class II in-depth Entire 120 months max. Team is Lead Inspector and Bridge Inspector with Engineer III leading the inspection. Hands-on entire deck soffit In place of hands-on inspection that cycle Senior engineer must be present. Includes stream cross sections; new clearance diagram In-depth (all bridge classes) Entire Deck survey. Half-cell potentials for exposed concrete surface. Hammer tapping of all cracked areas. Chain drag all surfaces Hands-on access to entire superstructures; maps of damage/loss. Ultrasonic testing of all nonredundant pins and hangers. 3 ft distance is OK. Ultrasonic testing on welds in fracture- critical members. 10 ft x 10 ft sounding grid for channel Measure all expansion bearings. Tap all anchor bolts. Probing of 50% of timber members. Arch profile against springline Plumb bob check for all substructure units Connecticut In-depth (all culvert classes) Entire Culverts measure water velocity upstream, downstream, and hydraulic opening In-depth pin/hanger Component 24 months Ultrasonic inspection of pins and hangers for suspended spans Florida Storm event—Level 3 In-depth inspection based on findings of Level 1 or 2 inspection 25-year-old bridge Entire Do “Detail” inspection Michigan Fatigue-prone details Component 36 months Redundant bridges having fatigue-prone details New Jersey Fracture critical Entire 48 months Alternate inspection cycles (continued ) TABLE F8 IN-DEPTH INSPECTIONS

156 In-depth— Cable-suspended span Component 120 months Cable-suspended spans Inspection of cables. Measure/record broken wires and amount/extent of corrosion In-depth—Concrete in corrosive environment Entire 120 months Large concrete structures located in a highly corrosive environment. Collect electrical potentials, chloride contents, amount of section loss in steel reinforcement In-depth—Concrete segmental bridge Component 120 months Concrete segmental bridge Inspection for corrosion of post- tensioning system and for longitudinal cracking In-depth—Electroslag welds Component 120 months Bridge has electroslag welds Nondestructive testing for fatigue cracks in the welds In-depth—Other special details Component 120 months Other details that warrant special inspection In-depth—Pin and hanger Component 120 months Redundant pin and hanger assemblies In-depth— stringer/floorbeam connections Component 120 months Stringer/floorbeam connections Oregon Movable bridge Component 72 months In-depth inspection of operational mechanism In-depth—Fracture critical Entire 120 months Fracture-critical member in fair or lesser condition Span 150 ft In-depth—Fracture critical 180 months Fracture-critical member in good condition In-depth—Redundant, not fracture critical 180 months Span >500 ft Pennsylvania In-depth—Redundant, not fracture critical 120 months Redundant, non-fracture-critical bridges Span >500 ft and superstructure in poor or lesser condition Ferry—Vehicle transfer spans Component 24 months Ferry terminal—Other structures/areas Component 24 months Movable bridge equipment Component 72 months In-depth for electrical and mechanical equipment Washington Underwater—In-depth Component (specific) As needed Detailed inspection of specific portions; may include nondestructive testing Wisconsin In-depth Entire 72 months DOT Name Scope Interval Notes TABLE F8 (Continued) IN-DEPTH INSPECTIONS

157 DOT Name Interval Notes 24 months State-owned bridges Alabama Underwater inspection 48 months Locally owned bridges Interim underwater <24 months Submerged components/areas of known or suspected problems 24 months Water >30 in. deep and having poor visibility, swift current, soft bottom, low headroom, debris, or other conditions that make wading/raft impractical Dive inspections 48 months max. Water >30 in. deep and having poor visibility, swift current, soft bottom, low headroom, debris, or other conditions that make wading/raft impractical Connecticut Special underwater Submerged components/areas. To monitor known or suspected deficiency Eastern Federal Lands Channel profile 24 months Along substructures Florida Underwater Water depth >1 m Underwater investigation 60 months Dive inspection by consultants for water >6 ft deep Iowa Underwater investigation 72 months Dive inspection by consultants for water >6 ft deep FHWA approval of 72-month interval Missouri Dive 60 months Underwater— Category I 48 months Components not visible during regular inspections. Inspection by wading, probing or from boats Montana Underwater— Category II 60 months Dive inspection by consultants Underwater Type 1 24 months Hands-on inspection. No diver. Channel cross section and scour evaluation Underwater Type 2 Dive inspection where wading/probing not possible and water at least 4 ft deep Cleaning: 100% Level I, 10% Level II Underwater Type 3 Dive inspection, in-depth for prior evidence of distress or scour Cleaning: 100% Level I, >10% Level II New Jersey Underwater Type 4 Dive inspection to prepare for replacement, rehabilitation, or priority repairs Cleaning: Level II Dive Water depth >0.9 m, water current >0.6 m/s, and chest waders not adequate 60 months Scour rating 4 or higher. Channel cross section 12 months Scour rating 1 or 2. Active structural flag for scour. Channel cross section Fathometer survey 24 months Scour rating 3. Channel cross section Scour documentation 24 months Fathometer readings along fascias and profiles along substructures 60 months General recommendation is 4 or greater 12 months Active flag due to structural condition General recommendation 1 or 2 New York Underwater 24 months General recommendation is 3 North Carolina Oklahoma Underwater Dive inspections for water > 5 ft (continued ) TABLE F9 UNDERWATER INSPECTIONS

158 12 months NBI Scour Code = 2 Scour SmartFlag in condition state 2 or 3 NBI Substructure Condition < 5 NBI Channel and Channel Protection < 5 Element 223 Submerged Seal Footing is exposed Combination of age, environment, history, importance, etc. 24 months NBI Scour Code 3 or “U” Scour SmartFlag in condition state 1 NBI Substructure Condition = 5 or 6 NBI Channel and Channel Protection = 6 Element 223 Submerged Seal Footing is exposed 48 months NBI Scour Code = 4 Scour Smartflag is not turned on NBI Substructure Condition = 6 or 7 NBI Channel and Channel Protection = 7 Oregon Underwater w/cross-channel profile 60 months NBI Scour Code 5 Scour SmartFlag is not turned on NBI Substructure Condition > 8 NBI Channel and Channel Protection > 8 12 months Scour critical; bridge closed 12 months Scour critical; substructure unit is unstable 24 months Substructure may be unstable 24 months Protection needed; substructure is stable 24 months Scour critical; substructure is stable 24 months Substructure integrity not known 60 months Previous scour problem; countermeasures in place Underwater 60 months No scour problems Pennsylvania Underwater only—U Inspection of underwater components only Dive—Level I Swim-by, minimal cleaning Dive—Level II Cleaning and detailed inspection of critical areas Dive—Level III Highly detailed inspection seeking hidden/internal deterioration Underwater, dive 60 months Water > 3.5 ft deep Tennessee Underwater, camera 60 months Can use dive or camera in alternate cycles Texas Underwater 60 months “Wet” year round and water depth > 4 ft Underwater, in-depth As needed Detailed inspection of specific portions; may include nondestructive testing Washington Underwater— Hands-on 60 months Swim-by. Clean 10% of submerged surface. Probe around submerged components. May identify portions and recommend in-depth inspection UW probe/visual 24 months Inspection from surface of water UW survey 24 months Streambed profile in vicinity of bridge Wisconsin UW dive 60 months Dive inspection DOT Name Interval Notes TABLE F9 (Continued) UNDERWATER INSPECTIONS

159 DOT Name Scope Interval Notes Alabama Fracture-critical details Component 24 months Connecticut Fracture critical— secondary roads Rotating 25% of details receive hands-on Bridges not on Interstate or other limited- access highway Fracture critical Component 24 months Fracture-susceptible bridges Fracture critical w/NDE Component 120 months Includes use of nondestructive testing Eastern Federal Lands UBIV fracture critical Component Iowa Fatigue Component 24 months Fracture-critical bridges, bridges with arrested cracks Minnesota Fracture critical 12 months Comprehensive inspection fracture-critical Missouri Most fracture-critical member Montana Fracture critical Component 24 months Fracture critical Component 24 months Hands-on for vulnerable areas and details New Jersey Fracture critical— In-depth Entire 48 month In-depth for alternate inspection cycles North Carolina Fracture critical Rhode Island Fracture critical 12 months 12 months Base metal is ASTM A7, A8, A94, A242, A440, A514, or A517 steel 24 months Age of structure > 30 years ADTT > 1000 Oregon Level 2— Fracture-critical inspection Level 2— Fracture-critical inspection Level 2— Fracture-critical inspection Level 2— Fracture-critical inspection Level 2— Fracture-critical inspection Level 2— Fracture-critical inspection Level 2— Fracture-critical inspection Level 2— Fracture-critical inspection Level 2— Fracture-critical inspection Level 2— Fracture-critical inspection Level 2— Fracture-critical inspection Level 2— Fracture-critical inspection Level 2— Fracture-critical inspection Component Component Component Component Component Component Component Component Component Component Component Component Component Age of structure < 30 years ADTT < 1000 Base metal has low values of toughness in field situations; similar to A514 or A517 Nonredundant riveted or bolted members in tension Bending with no welding present 48 months Detail vulnerable to fatigue or collision damage Nonredundant riveted or bolted members with tack welding present Nonredundant welded members in bending Nonredundant welded members in direct tension Pin and hanger assembly—Perform an initial UT of the pin and hangers and follow-up at least every 4 years E or E' detail—Perform an initial UT of the detail and follow up at least every 4 years Age of structure > 30 years Rolled members with no welds present 72 months (continued ) TABLE F10 FRACTURE-CRITICAL INSPECTIONS

160 DOT Name Scope Interval Notes Level 2— Fracture-critical inspection Level 2— Fracture-critical inspection Component Component ADTT > 1,000 Rolled members with no welds present Age of structure < 30 years Rolled members with no welds present 120 m onths ADTT < 1,000 Rolled members with no welds present 120 m onths Fracture-critical memb er in fair or lesser condition Span 150 ft Pennsylvania In-depth—Fracture critical Entire 180 m onths Fracture-critical memb er in good condition Virginia Fracture critical Component 12 m onths Washington Fracture critical Component 24 m onths Wisconsin Fracture critical Component 72 months UBIV = under bridge inspection vehicle; UT = ultrasonic testing ; NDE = nondestructive evaluation; ADTT = average daily truck traffic. TABLE F10 (Continued) FRACTURE-CRITICAL INSPECTIONS

161 DOT Complex Staff/Training Complex Inspections and Structures Alabama Master list of structures with unique or special features Alaska Yes Yes Arizona Arkansas California Experience, but not training No formal designations of structures or methods, but engineering oversight and judgment within districts Engineers investigate inspection practices for the “complex” bridges in their inventories and apply them to their inspections. Connecticut Yes Formal definition of three levels of structural complexity with defined team size and technical grade Delaware Yes Dye-Penetrant Test Training UBIV/Snooper Training for driving and operation Florida Yes Managers/supervisors provide technical guidance to inspection team training: Complex Bridge Inspection Course Movable Bridge Inspection Course Inspection Procedures for Trunnion Shafts of Vertical Lift Bridges Hanger and Pin Assemblies of Cantilever Superstructure Systems Iowa Yes Kentucky Yes Specific training or experience for some inspections Maine Yes Maryland Yes Drawbridge inspections require electrical and mechanical engineers for equipment Michigan Yes Segmental post-tensioned bridges Some inspections related to hydraulic engineering Montana Yes Master list of bridges with special features. These must receive special inspections Inspection team will include specialists, as needed Nevada New Jersey Yes Open-deck railroad bridges—Special attention to condition of ties Ultrasonic inspections Movable bridges New Mexico New York No Require all inspectors to handle any bridge Inventory indicates need for special equipment during inspection North Carolina No Require all inspectors to handle any bridge North Dakota Yes Training for segmental box bridges Ohio Yes Major bridges identified by span length and structure type Inspectors must demonstrate adequate experience In-depth inspection may require riggers, divers, or other personnel with special skills Oklahoma Yes Snooper inspection of “Long and Tall” bridges that are not fracture critical Monitoring pier movement with an electronic distance measuring device Oregon Yes Special expertise or equipment may be needed for: Movable bridge Suspension or cable-stayed bridge Tall bridge (continued ) TABLE F11 COMPLEX BRIDGES, INSPECTIONS, AND TEAMS

162 Texas Yes Unusual features such as external post-tensioned tendons For complex bridge inspections, consultants must have as project manager a PE with 7 years bridge inspection experience and BIRM training. At least one year of experience must be with complex bridges. The team leader for complex inspections must have 6 years bridge inspection experience and BIRM training. Utah Yes Yes Vermont Virginia Yes Movable bridge team is an electrical engineer, a bridge safety engineer, and a mechanical engineer. Washington Yes DOT keeps master list of bridges with special features or needing special equipment. Bridge Preservation Office has Special Structures Unit for complex types including: Movable bridges Floating bridges Suspension bridges Cable-stayed bridges Precast segmental bridges Ferry terminals West Virginia No No DOT Complex Staff/Training Complex Inspections and Structures UBIV = under bridge inspection vehicles; BIRM = Bridge Inspector’s Reference Manual. Pennsylvania Yes Prestressed concrete segmental bridges More experienced team leaders are used for more complex inspections Critical elements of complex structures may be inspected separately for use of special equipment or personnel Consultants hired for complex inspection by central office Rhode Island Yes One concrete segmental bridge One tied-arch bridge South Dakota No No complex bridges identified Tennessee No Movable, suspension, or cable-stayed bridges Other bridges with unusual characteristics No special qualifications for personnel TABLE F11 (Continued) COMPLEX BRIDGES, INSPECTIONS, AND TEAMS

163 DOT Name Scope Interval Note Alabama Special C— Suspension and movable bridges Entire Movable bridge 12 months Poor condition Florida Movable portion Operation 12 months Maryland Drawbridge Equipment Team has electrical engineer and mechanical engineer Michigan Movable equipment, routine Equipment 72 months Movable bridge equipment Movable Bridge— Type I Equipment In-depth electrical, mechanical equipment inspection Movable Bridge— Type II Equipment Medium-depth electrical, mechanical equipment inspection New Jersey Movable Bridge— Type III Equipment Visually monitor operation of electrical, mechanical equipment North Carolina Movable span inspections Oregon Movable bridge Entire 12 months Cursory inspection for operation Virginia Movable bridge Special team having an electrical engineer, a bridge safety engineer, and a mechanical engineer Movable bridge operation Operation 1 month Trial opening of span Special feature— Movable 12 months Inspector has special training or experience Washington Movable bridge equipment Equipment 72 months In-depth for electrical and mechanical equipment Wisconsin Movable bridge 12 months TABLE F12 ROUTINE INSPECTIONS OF MOVABLE BRIDGES

164 DOT Inspection Scope Interval Notes Special K— Interim inspection Posted bridge Alabama Special L— Interim inspection Bridges with condition codes of 4 or less Interim—Load posted Component Posted bridge Connecticut Interim—Pin and hanger Component Monitor pin and hanger Priority A—zero remaining life Eastern Federal Lands Interim— Structurally deficient Priority B—2 to 5 years remaining life Interim Component Condition rating <5 6 months Condition rating 3, for deck, superstructure, substructure, channel, culvert, or approach roadway Florida Regular Entire Regular Entire 12 months Condition rating = 4, for deck, superstructure, substructure, channel, culvert, or approach roadway Maryland Out-of-cycle inspection Component Bridge deck Component 9 to 15 months Deck condition rating = 3 9 months max. Substructure condition rating = 3 Concrete substructure Component 15 months max. Substructure condition rating = 4 9 months max. High-load hit—Rebar exposed Concrete tee beam Component 15 months max. Main rebar exposed Posted— Deterioration 9 months max. Weakened by deterioration Posted—Design 9 to 15 months Designed to lower standard Shear cracks Prestressed box beam Component 15 months max. Beam exhibits lateral movement 9 months max. Loss of bearing at two adjacent beamsPrestressed I beam Component 15 months max. Loss of bearing/spall Scour critical 15 months max. On scour critical list Steel section loss 25% <6 months Fatigue cracks High-load hit Michigan Steel superstructure Component 9 months max. Temporary supports for beams Load posted for operating rating Superstructure condition rating 3 or less New Jersey Interim inspection Component 12 months Substructure condition rating 3 or less 12 months Scour rating 1 or 2. Active structural flag for scour Fathometer survey, channel cross section Component 24 months Scour rating 3 General recommendation 3, assigned by inspector Condition rating weighted average 3, computed by NYSDOT data system Inactive red flag or active yellow flag Posted bridge Poor condition New York Interim (Type 2) Interim (Type 2) Interim (Type 2) Interim (Type 2) Interim (Type 2) Entire Entire Entire Entire Entire 12 months (continued ) TABLE F13 ROUTINE INTERIM INSPECTION

165 Load capacity issue Local failures possible Concrete shear cracks continue to grow <12 months Serious traffic hazard Primary structural element condition rating < 3 Primary structural element deteriorated and affecting load capacity of bridge General condition of bridge is poor Temporary repair of primary structural element is in poor condition Interim 12 months Operating rating factor <1 for any of three permit truck configurations 6 months Signs of culvert failure exists; bottom buckling in CMP, etc. Oregon Routine— Culvert Entire 12 months Culvert (62) condition 3 or 4. Any culvert element quantity in state 4 Interim (special)—I Component 24 months Between routine inspections, to provide reduced interval for component 6 months Condition rating 3 or less for fracture-critical superstructure Condition rating 3 or less for superstructure, substructure, or culvert; not fracture-critical 12 months Condition rating 4 or less for fracture-critical superstructure Temporary bridge6 months Bridge with temporary support Routine Entire Routine Entire Routine Entire 12 months Posted bridges Pennsylvania Special Component <24 months Examine known or expected deficiencies 6 months Frozen pins/hangers, non-redundant structures Frozen pins/hangers, redundant structures Pin and hanger— Ultrasonic testing Component 12 months Non-redundant structures. New or newly replaced pins 12 months Restricted weight limit Virginia Routine Component 12 months General condition rating <4 Wisconsin Interim Component 12 months Suspect details. Unscheduled inspection DOT Inspection Scope Interval Notes Unrepaired critical findings Interim (Type 2) Interim (Type 2) Entire Entire Posted bridge General appraisal 2 or less (9 to 0 scale, “2” is critical) Ohio Interim <12 months Drastic load reductions (~75%) TABLE F13 (Continued) ROUTINE INTERIM INSPECTION

166 DOT Name Notes Deck surveys Damage mapping for deck. Visual inspection, hammer tapping, additional testing as necessary Joint measurements Measurement for monitoring Settlement Measurement for monitoring Interim A Pin and hanger or hinge measurements Interim B Shiplap measurements Interim C Tipping/settlement of substructure Interim D Lateral movement of beams and bearings Interim E Temporary bents and supports Interim F Crack growth Connecticut Interim G Check for scour or undermining Live, remote monitoring of scour vulnerable bridges during high flow periods Delaware Storm inspection Live, remote monitoring of flow in selected waterways Concrete deck studies Component investigation Eastern Federal Lands Vertical clearance After new overlay or rehabilitation Storm event—Level 1 Site visit to verify that approaches are intact with no obvious problem Storm event—Level 2 Measure channel profile Florida Storm event—Level 3 In-depth inspection based on findings of Level 1 or 2 inspection Iowa Local surveillance To monitor specific elements; NBIS team leader preferred but not required Maryland Ultrasonic inspection of pins Michigan Scoping Selection for bridge program. Development of repair project. More precise evaluations such as deck sounding and beam thickness measurements after cleaning. Information is given to the previous bridge inspector to adjust their ratings. New York Special—Type 5 Address maintenance or inspection concerns unique to bridge. Results not entered in database. North Carolina Ultrasonic inspections Oregon Concrete corrosion survey Interim (special) Limited to critical areasPennsylvania Special (problem area)—P Special areas as directed by management Tennessee Repair Verify repairs done to bridge NBIS = National Bridge Inspection Standards. TABLE F15 SPECIAL INSPECTIONS DOT Inspection Interval Notes Connecticut Routine—Bridges 48 months In service four years Had in-depth inspection Condition ratings 6 or better HS 30 inventory Single span <100 ft span Less than 75 years old 14 ft vertical clearance ADT < 125,000 ADTT < 10% Eastern Federal Lands Bridges 48 months Main elements condition rating >5 Montana NBI/element level inspection 48 months Prestressed structures MDT design standards Length < 100 ft Known good condition Oregon Routine—Culvert 48 months Culvert (62) condition 6 or better Element state 100% 1 or 2 ADT = average daily traffic; ADTT = average daily truck traffic; MDT = Montana Department of Transportation. TABLE F14 FORTY-EIGHT-MONTH INTERVAL FOR ROUTINE INSPECTION

167 DOT Inspection Interval Note Connecticut Sign structure 48 months Overhead sign support Ferry slip Ferry slip Sign structure 24 months Overhead sign Florida Tunnel Tunnel Pedestrian bridge 48 months Pedestrian bridge—Inspect for hazards to highway below. Inspect for high load hits. Inspection by NBIS team leader. Owner notified of conditions needing attention. Iowa Railroad bridge 48 months Railroad bridge—Inspect for hazards to highway below. Inspect for high-load hits. Inspection by NBIS team leader. Owner notified of conditions needing attention. Maryland Electrified railroad bridge Electrified railroad bridges Minor bridge State DOT inspects spans down to 10 ft. Local agencies are only required to inspect structures 20 ft and above. Pedestrian bridge Pedestrian bridges. NBI procedures, but not reported to FHWA Michigan Railroad bridge Railroad bridge over public road. NBI procedures, but not reported to FHWA Montana Minor bridge Spans down to 8 ft on national and state highway systems, or on transporter erector routes Minor culverts Inspected as funds allow Noise wall Noise reduction walls New Jersey Railroad bridge Open deck railroad bridges. Inspect condition of ties as hazard to road below New York Sign structure Overhead sign structure; rating scale similar to bridges Adjacent structure All structures, over or adjacent to public roads, that in failure would cause immediate danger to traveling public Minor bridge Minor structures; spans down to 6 ft Oregon Tunnel Tunnels Conveyor belt Conveyor belts High-mast light High-mast lighting Highway environs—H 24 months Non-bridge over highway. Inspection limited to highway environs Minor bridge—R 24 months Bridge spans 8 to 20 ft Minor bridge—W 24 months Routine and underwater inspection. Bridge spans 8 ft to 20 ft Miscellaneous —M 24 months Other miscellaneous structure; NBIS style Noise walls— M 24 months Noise walls; NBIS style Overhead structure—O 24 months Overhead, non-highway bridge. Inspection usually performed by owner. Pipe truss Pipe trusses Retaining Wall—M 24 months Retaining walls; NBIS style Sign structure—S 24 months Sign structure; NBIS-like inspection Pennsylvania Utility structures Tennessee Minor bridge Minor structures with spans of 4 ft or more and fill/cover less than 16 ft Minor culvert 48 months Any minor structure not identified as culvert Minor culvert 48 months Minor culvert with opening greater than 36 square feet Virginia Overhead structure 24 months Overhead structures. Vertical and lateral clearances (continued ) TABLE F16 ROUTINE INSPECTION OF MINOR BRIDGES AND NON-BRIDGES

168 Ferry terminal—Vehicle transfer spans12 months Ferry terminal—Other structures/areas Ferry terminal—Vehicle transfer spans. In-depth inspection Ferry terminal 24 months Ferry terminal—Other structures/areas. In-depth inspection Ferry terminal equipment 12 months Ferry terminal equipment. Electrical systems, mechanical systems, hoists Ferry terminal soundings 12 months Soundings at vehicle transfer spans of ferry terminals Highway lid 60 months Bridge span < 20 ft, on STRAHNET highway Bridge span < 20 ft, operating rating less than HS 10 Bridge span < 20 ft, vertical clearance < 18 ft Single steel or concrete spans 6 ft to 20 ft Steel corrugated pipes, spans 8 ft to 20 ft Minor bridge 72 months Timber spans 4 ft to 20 ft Multiple pipe 72 months Multiple pipes out to 10 ft to 20 ft Multiple span 72 months Multiple spans 8 ft to 20 ft Overhead structures Safety inspection of structures crossing state-owned facilities Pedestrian bridge 60 months Pedestrian bridge Private bridge 60 months Private bridges over public highways Sign structure Sign bridges Washington Tunnel 24 months Tunnels NBIS = National Bridge Inspection Standards; STRAHNET = Strategic Highway Network. DOT Inspection Interval Note DOT Maintenance Source State Police Source Public Source Stored in Bridge File (paper) Stored in BMS/Database Alaska Yes Yes If significant Arizona No Arkansas No California Yes Yes Delaware Yes Yes Idaho No Iowa Yes No Kentucky Yes Maine Yes Inspection report Maryland Yes Yes Yes Michigan Yes Missouri Yes No Nevada Yes New Mexico No New York No North Carolina Yes (Annual ride by) No North Dakota Yes Ohio Yes No Oregon Yes Yes Inspection report Pennsylvania Yes Rhode Island Yes No South Dakota Yes No Texas Yes No Utah No Vermont Yes No Virginia No Washington Yes Yes Inspection report West Virginia Yes TABLE F16 (Continued) ROUTINE INSPECTION OF MINOR BRIDGES AND NON-BRIDGES TABLE F17 U.S. INFORMAL INSPECTIONS

169 DOT Method Notes Alabama Visual monitor Of known defect, by maintenance crew Alaska Measurement Vertical or horizontal survey Visual monitor Of known defect, by maintenance crewArizona Measurement Movement Arkansas Measurement Deflection, differential movement Visual monitor Real-time monitor during high water Measurement Crack gages, deck grades, EDM, Stringline California Instrumentation Remote scour monitoring for scour-critical bridges Delaware Measurement Deflection, elevations, movement, settlement Eastern Federal Lands Visual monitor Idaho Measurement Crack length, crack progress Visual monitor By district personnel; might not be team leader Iowa Measurement Crack opening, movement Visual monitor For scour Kentucky Measurement Crack gage Measurement Crack growth, element rotationMaine Instrumentation Acoustic emission Measurement Crack opening, deflection, movement Maryland Instrumentation Visual monitor For scour Missouri Measurement Crack opening, deflection, movement Montana Visual monitor Nevada Instrumentation As appropriate until repaired Visual monitor Tracking defect without interim inspectionNew Jersey Instrumentation For scour displacement probes, sonar probes New Mexico Measurement Crack opening, deflection New York Measurement Crack growth North Carolina Visual monitor Visual monitor For progress of defectNorth Dakota Measurement Crack growth, movement Ohio Measurement Crack monitor Oklahoma Measurement Movement Measurement Crack growth Oregon Instrumentation Acoustic emission, strain gages Visual monitor For scour, after high water by maintenance crew or county manager Measurement Movement Pennsylvania Instrumentation Inclinometers, strain gages, other detectors South Dakota Visual monitor For known defect Tennessee Visual monitor For known defect Instrumentation Acoustic emission Texas Measurement Crack growth Measurement Crack opening Utah Instrumentation Ultrasound, electrochemical crack detection Vermont Visual monitor For scour after high water, for crack growth, for movement Virginia Visual monitor For known defect Visual monitor For known defectWashington Measurement Movement, settlement, streambed profile Visual monitor For known defect Measurement Crack opening, deflection, movement West Virginia Instrumentation Acoustic emission, strain gages, EDM = electronic distance meter. TABLE F18 BRIDGE MONITORING

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TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 375: Bridge Inspection Practices examines bridge inspection practices in the United States and selected foreign countries. The report explores inspection personnel (staff titles and functions, qualifications, training and certification, inspection teams, and the assignment of teams to bridges), inspection types (focus, methods, and frequency), and inspection quality control and quality assurance. The report also reviews the uses agencies make of information gathered from bridge inspections, what triggers repairs, and plans for future development of inspection programs.

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