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Funding and Managing the U.S. Inland Waterways System: What Policy Makers Need to Know (2015)

Chapter: Appendix F: Summary of Correlations Between Lock Performance and Lock Age (in 2014) Calculated from the Date of Known Major Rehabilitation Construction

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Page 194
Suggested Citation:"Appendix F: Summary of Correlations Between Lock Performance and Lock Age (in 2014) Calculated from the Date of Known Major Rehabilitation Construction." National Academies of Sciences, Engineering, and Medicine. 2015. Funding and Managing the U.S. Inland Waterways System: What Policy Makers Need to Know. Washington, DC: The National Academies Press. doi: 10.17226/21763.
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APPENDIX F

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Summary of Correlations Between Lock Performance and Lock Age (in 2014) Calculated from the Date of Known Major Rehabilitation Construction

River System Average Age of Lock Installations (years) Correlation with Effective Age of Locks on a River System
Lockages Vessels Delayed (%) Tows Delayed (%) Average Vessel Delay Average Tow Delay Average Closure Duration Closure Frequency
All installations 61.04 0.2184 0.1404 -0.0750 0.1321 -0.1226 0.1691 0.2254
Ohio River 35.45 -0.0076 -0.0957 -0.0959 0.1081 0.0400 0.2407 -0.0477
Mississippi River 24.86 -0.3019 0.1758 -0.0103 -0.2738 -0.0463 0.6458 0.1295
Illinois River 22.28 -0.5754 0.0357 -0.2425 -0.3880 -0.2560 -0.6243 -0.5700
Columbia–Snake Rivers 44.88 -0.1953 0.1088 0.1566 0.0851 0.0677 0.8220 0.4676
Gulf Intracoastal Waterway 71.80 0.1603 0.1273 0.1050 -0.1422 -0.1403 0.2972 -0.1875
Arkansas River 45.33 0.4568 -0.7410 -0.7359 -0.7123 0.4552 -0.2562 -0.1563
Page 195
Suggested Citation:"Appendix F: Summary of Correlations Between Lock Performance and Lock Age (in 2014) Calculated from the Date of Known Major Rehabilitation Construction." National Academies of Sciences, Engineering, and Medicine. 2015. Funding and Managing the U.S. Inland Waterways System: What Policy Makers Need to Know. Washington, DC: The National Academies Press. doi: 10.17226/21763.
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Black Warrior, Tennessee, Tennessee–Tombigbee, Tombigbee 61.04 0.3474 0.5655 0.7040 0.3585 -0.1630 -0.1735 0.7485
Monongahela River 56.67 0.5545 0.7521 0.8632 0.5526 0.3800 Gaps in data 0.6358
Allegheny River 61.75 -0.0454 0.3048 -0.0426 0.1435 -0.1276 Gaps in data 0.0612

NOTE: High positive correlation (dark blue shading), greater than 75 percent correlation; high negative correlation (dark pink shading), less than -75 percent correlation; medium positive correlation (light blue shading), between 50 and 75 percent correlation; low correlation (white), within ±50 percent correlation. Some rivers indicate negative correlations with lock age because the correlations are affected by traffic level and rehabilitation; that is, some of the older locks have less traffic and so fewer traffic-related problems, or they may be rehabilitated and so experience fewer closures and delays.

SOURCE: U.S. Army Corps of Engineers Lock Use, Performance, and Characteristics, http://www.navigationdatacenter.us/lpms/lpms.htm, Locks by Waterway, Tons Locked by Commodity Group, Calendar Years 1993–2013; Locks by Waterway, Lock Usage, Calendar Years 1993–2013; and Locks by Waterway, Locks Unavailability, Calendar Years 1993–2013. Accessed July 2014.

Page 194
Suggested Citation:"Appendix F: Summary of Correlations Between Lock Performance and Lock Age (in 2014) Calculated from the Date of Known Major Rehabilitation Construction." National Academies of Sciences, Engineering, and Medicine. 2015. Funding and Managing the U.S. Inland Waterways System: What Policy Makers Need to Know. Washington, DC: The National Academies Press. doi: 10.17226/21763.
×
Page 194
Page 195
Suggested Citation:"Appendix F: Summary of Correlations Between Lock Performance and Lock Age (in 2014) Calculated from the Date of Known Major Rehabilitation Construction." National Academies of Sciences, Engineering, and Medicine. 2015. Funding and Managing the U.S. Inland Waterways System: What Policy Makers Need to Know. Washington, DC: The National Academies Press. doi: 10.17226/21763.
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Page 195
Next: Appendix G: Energy Intensity Comparisons for Water, Rail, and Highway »
Funding and Managing the U.S. Inland Waterways System: What Policy Makers Need to Know Get This Book
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TRB Special Report 315: Funding and Managing the U.S. Inland Waterways System: What Policy Makers Need to Know explores the role and importance of the federally funded inland waterways system, priorities for future investment, its beneficiaries, and sources of funding.

In recent years, the inland waterways system has transported six to seven percent of all domestic ton-miles of cargo. The system is a small but important component of the national freight system, particularly for bulk commodities. The study committee finds that, in order to ensure efficient use of limited navigation resources, the most critical need for the inland waterways system is a sustainable and well-executed plan for maintaining system reliability and performance. Reliability and performance will depend on placing higher priority on investments in operations and maintenance (O&M). Without a funding strategy that prioritizes system preservation, maintenance may continue to be deferred, which would result in further deterioration and in a less cost effective and less reliable system.

The committee finds that more reliance on a “user-pays” funding strategy for the commercial navigation system is feasible, would generate new revenues for maintenance, and would promote economic efficiency.

The committee suggests that an asset management program focused on economic efficiency, fully implemented and linked to the budgeting process, would help prioritize maintenance spending and ascertain the funding levels required for reliable freight service.

View the TRB Special Report 315 webcast.

View the press release.

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