Road Creek Passage Barrier Removal and Bridge Installation

Salmonid Habitat Restoration and Acquisition

Fish Passage Improvement Riparian Habitat
Project ID020 19 SA
Recovery DomainsInterior Columbia
Start Date12/09/2021
End Date10/31/2023
Last Edited03/22/2022
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The Road Creek culvert replacement project, sponsored by the Custer Soil and Water Conservation District, is a collaborative effort with the Idaho Department of Fish and Game, Custer County Road and Bridge and Custer County Commissioners. The design work is being completed by Idaho Department of Fish and Game as a part of their fish recovery efforts.

East Fork is a key spawning area for Salmon and Steelhead. Road Creek is a small tributary to the East Fork. The project will address the removal of an existing barrier and installation of a new structure in the historic channel of Road Creek. The current culvert is undersized and a fish barrier at all flows. This project would install a new structure/bridge in place of the undersized culvert, shape the streambed to meet fish passage and rehabilitate the stream in the vicinity of the work.

Project Benefit    

This project will remove a passage barrier on Road Creek to improve fish passage and/or flow. By removing the 4-ft diameter straight (not squash) culvert and installing a bridge to provide access over the county road at Road Creek, the project will essentially reconnect the lower reach of Road Creek to the main stem of the East Fork. The project also entails creating fish passage within the channel to improve upstream and downstream movement for all life stages. In the past five years, this culvert has been over-topped and washed sediment from the Road Creek into the East Fork of the Salmon River. As flows rise in spring runoff, the culvert plugs and washes out around the culvert, adding sediment to the stream. This has happened multiple times with a significant event in 2017. In August of 2021 a flash flood took out a large section of the road and cut a new channel of Road Creek through soft soil. This washed bedload and sediment into the East Fork in advance of spawning season. It is anticipated that this will continue unless the culvert is replaced with a structure large enough to carry high flows and provide passage for fish.
The goal of this project is to re-establish fish passage for Chinook salmon and Steelhead trout in Road Creek, a tributary to the East Fork, and to reduce sediment. The objective is to provide access to 1.18 miles of habitat as well as increase spawning habitat for adult salmonids and rearing habitat for juvenile salmonids in the lower reach of Road Creek near the confluence of East Fork. This will improve the limiting factors of fish passage, sedimentation and riparian condition.


Metric Completed Originally
Riparian Habitat
  Stream Miles Treated .17
  Acres Treated 1.0
Fish Passage
  Barriers Removed
  Miles Opened 1.18

Funding Details

In-Kind Other$25,410
Report Total:$378,740

Project Map


Culvert to Bridge site    

  • Worksite Identifier: Culvert to Bridge site
  • Start Date: 07/01/2022
  • End Date: 09/30/2023
Area Description

No Area Description data was found for this worksite.

Location Information

  • Basin: Salmon
  • Subbasin:
  • Watershed:
  • Subwatershed:
  • State: Idaho
  • Recovery Domain: Interior Columbia
  • Latitude: 44.186987
  • Longitude: -114.287044


  • Snake River Basin Steelhead DPS
  • Snake River Spring/Summer-run Chinook Salmon ESU
  • Snake River Fall Chinook Salmon ESU




  • C.0 Salmonid Habitat Restoration and AcquisitionY (Y/N)
    •      . . C.0.a Habitat restoration and acquisition funding .00
    •      . . C.0.b Length of stream treated/protected
    •      . . C.0.c
      Project identified in a Plan or Watershed Assessment
    •      . . C.0.d.1 Project Monitoring (LOV)
    •      . . C.0.d.2 Monitoring Location (LOV)
    •      . . C.2 Fish Passage ImprovementY (Y/N)
      •      . . . . C.2.a Fish Passage Funding
      •      . . . . C.2.b.1 Length of stream made accessible
      •      . . . . C.2.b.3 Type of blockage/barrier (LOV)
      •      . . . . C.2.b.4 Number of blockages/impediments/barriers impeding passage
      •      . . . . C.2.g.1 Bridge installed or improved at road stream crossingY (Y/N)
        •      . . . . . . C.2.g.2 Number of bridges installed or improved/upgraded
        •      . . . . . . C.2.g.3 Miles of stream made accessible by bridge installation or improvement/upgrade
      •      . . C.5 Riparian Habitat ProjectY (Y/N)
        •      . . . . C.5.a Riparian Habitat Funding
        •      . . . . C.5.b.1 Total riparian miles streambank treated
        •      . . . . C.5.b.2 Total Riparian Acres Treated
        •      . . . . C.5.c.1 Riparian plantingY (Y/N)
          •      . . . . . . C.5.c.2
            Species of plants planted in riparian
          •      . . . . . . C.5.c.3 Acres planted in riparian
          •      . . . . . . C.5.c.4 Miles of streambank treated with riparian planting