Lemhi RM32 Habitat Enhancement Project, Confluence Phase

Salmonid Habitat Restoration and Acquisition

Instream Habitat Riparian Habitat
Project ID014 21 SA
Recovery DomainsInterior Columbia
Start Date01/01/2023
End Date10/31/2025
Year2021
StatusOngoing
Last Edited08/01/2023
 
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Description    


The Confluence Phase of the RM32 Habitat Enhancement Project will improve 1.19 miles of habitat on the Lemhi River and Hayden Creek. Hayden Creek is the most productive tributary of the Lemhi River, containing up to 40 percent of the spawning Chinook Salmon in the basin each year along with populations of Steelhead and Bull Trout. This section of the Lemhi River is currently a single channel system with high gradient and little to no rearing and overwintering habitat. This project includes raising riffles in the existing Lemhi River, grading inlets to relic side channels, grading new channels and floodplains along side channels, and installing instream wood structures which will improve and expand the riparian corridor and create off channel habitat and a side channel network allowing juvenile salmonids the opportunity to stay in the Lemhi basin longer before moving downriver. The project will also improve the L-40 diversion to reduce maintenance of the existing wing dam and headgate infrastructure and improve operational functionality. Fencing will protect the project from cattle after completion, and both plants and seeds will be installed. The site will be treated for noxious weeds. Trout Unlimited is the project sponsor and is working in partnership with the U.S. Bureau of Reclamation, Lemhi Soil and Water Conservation District, The Nature Conservancy, and the Upper Salmon Basin Watershed Program.

Project Benefit    


Expanding and enhancing side channel habitat will improve habitat capacity for juvenile Chinook Salmon and steelhead. Reactivating relic side channels and grading new channels will widen the riparian corridor and provide more habitat for fish, while wood structures will add habitat complexity. Constructing riffles in the existing Lemhi River channel will lead to more floodplain activation which will increase the amount of fish habitat and improve the current riparian vegetation. The project’s location downstream of spawning grounds on the Lemhi River and Hayden Creek provides an opportunity to provide habitat for rearing parr and overwintering pre-smolts, keeping them in the Lemhi River longer.

Accomplishments

Metric Completed Originally
Proposed
Instream Habitat
  Stream Miles Treated 1.19
Riparian Habitat
  Stream Miles Treated .25
  Acres Treated 1.3

Funding Details

SourceFunds
PCSRF$388,436
Other$128,185
Report Total:$516,621


Project Map



Worksites

Confluence Phase    


  • Worksite Identifier: Confluence Phase
  • Start Date: 08/01/2023
  • End Date: 05/31/2025
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: 44.871333
  • Longitude: -113.626521

ESU

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

Map

Photos

Metrics

Metrics
  • 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.4 Instream Habitat ProjectY (Y/N)
      •      . . . . C.4.a Instream Habitat Funding
      •      . . . . C.4.b Total length of instream habitat treated
      •      . . . . C.4.c.1 Channel reconfiguration and connectivityY (Y/N)
        •      . . . . . . C.4.c.2 Type of change to channel configuration and connectivity (LOV)
        •      . . . . . . C.4.c.3 Miles of stream treated for channel reconfiguration and connectivity
        •      . . . . . . C.4.c.4 Miles of off-channel stream created through channel reconfiguration and connectivity
        •      . . . . . . C.4.c.6 Instream pools created/added through channel reconfiguration and connectivity
      •      . . . . C.4.d.1 Channel structure placementY (Y/N)
        •      . . . . . . C.4.d.2 Material used for channel structure (LOV)
        •      . . . . . . C.4.d.3 Miles of stream treated through channel structure placement
        •      . . . . . . C.4.d.5 Pools expected to be created through channel structure placement
        •      . . . . . . C.4.d.7 Number of structures placed in channel
      •      . . . . C.4.e.1 Streambank stabilization Y (Y/N)
        •      . . . . . . C.4.e.2 Material Used For Streambank Stabilization (LOV)
      •      . . 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
        •      . . . . C.5.d.1 FencingY (Y/N)
          •      . . . . . . C.5.d.2 Miles of fence along stream
          •      . . . . . . C.5.d.3 Acres of riparian area protected by fencing
        •      . . . . C.5.h.1 Riparian plant removal/controlY (Y/N)
          •      . . . . . . C.5.h.2
            Species of plants treated/removed in riparian
          •      . . . . . . C.5.h.3 Acres of riparian treated for plant removal/control
          •      . . . . . . C.5.h.4 Miles of streambank treated for riparian plant removal/control