Development of On-Bridge Stormwater Treatment Practices

Stormwater treatment of bridge deck runoff continues to be a design challenge. Traditional methods of treating this runoff suggest treating an equivalent area of roadway offsite that discharges to the same receiving water body or piping the bridge deck stormwater to an offsite treatment location. NCHRP_Report_778: Bridge Stormwater Runoff Analysis and Treatment Options concludes that treatment of runoff from a comparable section of highway on land is preferable to treatment of runoff from the bridge deck. Where offsite mitigation is unacceptable due to (1) water quality restrictions placed on the receiving water body or (2) site-specific conditions making the piping of bridge runoff to bridge ends for offsite treatment infeasible or undesirable, stormwater designers have few options for effective on-bridge treatment of stormwater. There is a growing need to develop more options for on-bridge treatment of stormwater. Research is needed to address on-bridge stormwater treatment challenges, including, but not limited to level of service; structural integrity; hydraulic function (including spread width); litter and sediment loads; freeze-thaw cycles; maintenance operations; and work zone safety. The objectives of this research are to develop the following: (1) On-bridge stormwater treatment applications with a focus on retrofitting existing bridges utilizing proven stormwater treatment practices; and (2) Guidelines for selection (e.g., by media and materials), design, placement, and maintenance of the developed on-bridge stormwater treatment applications. The primary users of these guidelines will be bridge and hydraulic designers.


  • English


  • Status: Completed
  • Funding: $500000
  • Contract Numbers:

    Project 25-61

  • Sponsor Organizations:

    National Cooperative Highway Research Program

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC  United States  20001

    American Association of State Highway and Transportation Officials (AASHTO)

    444 North Capitol Street, NW
    Washington, DC  United States  20001

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Project Managers:

    Jared, David

  • Performing Organizations:

    GeoSyntec Consultants

    838 SW First Avenue, Suite 430
    Portland, OR  United States  97204
  • Principal Investigators:

    Poresky, Aaron

  • Start Date: 20200914
  • Expected Completion Date: 20240314
  • Actual Completion Date: 20240314

Subject/Index Terms

Filing Info

  • Accession Number: 01707488
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 25-61
  • Files: TRB, RIP
  • Created Date: Jun 4 2019 1:21PM