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1 NCHRP Project 14-36, âProposed AASHTO Guides for Bridge Preservation Actions,â produced two guides for the preservation of highway bridges. One is a general guide to preser- vation of highway bridges, referred to as the Bridge Guide in this report. The other is a guide to preservation of highway bridge decks, referred to as the Deck Guide in this report. The Bridge Guide was approved for publication by AASHTOâs Committee on Bridges and Structures (COBS) in June 2019. The Deck Guide was submitted to AASHTOâs COBS for review and possible publication in 2020. The Guides provide information on highway bridges that are candidates for preservation, actions to preserve bridges, costs and benefits of bridge preservation, and the organization of programs for bridge preservation. The NCHRP Project 14-36 research team prepared the Guides. The team collected informa- tion on current U.S. DOT practice in bridge preservation and collected data from state depart- ments of transportation (DOTs) on the effects, service duration, and costs of actions for bridge preservation. NCHRP Research Report 950 is the final report for NCHRP Project 14-36. It is a companion to the two Guides. Information on bridge preservation candidates, actions, costs, and benefits is presented in the Guides. Information on the literature search and data collected from state DOTs is presented in this report. This report summarizes the concept of bridge preservation, including bridge candidates and preservation actions; outlines the current practice of bridge owners in bridge preservation; provides state summaries of current practice in bridge preservation; presents data on preser- vation actions, context, and performance collected from state DOTs; and provides extended outlines of the Bridge Guide and the Deck Guide. The report is presented in five chapters and five appendices: Chapter 1: Overview Chapter 2: Bridge Preservation Chapter 3: Current Practice in Bridge Preservation Chapter 4: Context, Performance, and Cost of Bridge Preservation Actions Chapter 5: Guides to Preservation Appendix A: Detailed Information on the Current Practice in Bridge Preservation Appendix B: Summaries of Information from State DOTs Appendix C: Detailed Information on the Context, Performance, and Cost of Bridge Preservation Actions Appendix D: Bridge Guide Appendix E: Deck Guide C H A P T E R 1 Overview