Sweetwater Bridge and Stream Design

Salmonid Restoration Planning and Assessments

Restoration Planning And Coordination
Project ID007 23 CW
Recovery DomainsSnake River
Start Date11/29/2023
End Date04/30/2026
Last Edited05/13/2024
1 - 1


The Nez Perce Tribe will design a channel realignment and bridge replacement on a 0.20 mile segment of Sweetwater Creek near the confluence of Sweetwater Creek and Lapwai Creek in Idaho. Current habitat conditions include a straightened stream segment which contains little Large Woody Debris, is confined by Webb Road and agricultural fields, no side channels or other lateral habitat, a floodplain that has been converted to agricultural or cut off by the county road, and limited riparian vegetation. The stream is confined by a concrete wall forcing it into an undersized and aging bridge. The current bridge has a 100-year backwater level of two feet and an overtopping flood at the 2-year interval. This leads to frequent juvenile salmonid stranding in the adjacent agricultural fields.

Project actions include: 100% designs for 1) A bridge that will pass flows of a 100-year event, meet county bridge requirements, allow full aquatic organism passage at all flows, and 2) a properly aligned stream channel that will increase length and complexity (including large wood, side channels, pools, and cover), increased access to floodplain and adjacent riparian habitat, and properly intersect with the county road and bridge. Completed designs will be used for projected implementation in 2026.

Project Benefit    

Designs for a properly sized bridge and more complex stream segment (including large wood, pools, and stream length) would greatly reduce juvenile salmonid stranding, directly increase Essential Fish Habitat for ESA listed Steelhead and reintroduced Spring Chinook and Coho Salmon, expand floodplain access, and increase native riparian vegetation including large woody species.


Metric Completed Originally

Funding Details

Report Total:$125,000

Project Map


WS 1    

  • Worksite Identifier: WS 1
  • Start Date: 05/01/2024
  • End Date: 04/30/2026
Area Description

No Area Description data was found for this worksite.

Location Information

  • Basin: Clearwater (170603)
  • Subbasin:
  • Watershed:
  • Subwatershed:
  • State: Idaho
  • Recovery Domain: Snake River
  • Latitude: 46.3462532
  • Longitude: -116.8283148


  • Snake River Basin Steelhead DPS




  • B.0 Salmonid Restoration Planning and AssessmentsY (Y/N)
    •      . . B.0.a Planning And Assessment Funding .00
    •      . . B.0.b.1 Area Encompassed
    •      . . B.0.b.2 Stream Miles Affected
    •      . . B.1 Restoration Planning And CoordinationY (Y/N)
      •      . . . . B.1.a Planning and Coordination funding
      •      . . . . B.1.b.11 Engineering/design work for restoration projectsY (Y/N)
        •      . . . . . . B.1.b.11.a
          Name of plan implemented
        •      . . . . . . B.1.b.11.b
          Description and scope of the plan implemented