Hayden Creek Hermits Habitat Improvement

Salmonid Habitat Restoration and Acquisition

Instream Habitat
Project ID016 19 SA
Recovery DomainsInterior Columbia
Start Date01/01/2019
End Date03/31/2022
Last Edited10/21/2021
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Hayden Creek is the largest tributary to the Lemhi River, and contributes a significant portion (average of 30-40%) of the Lemhi Rivers total annual streamflow. It remains a productive spawning stream for wild steelhead and Chinook Salmon with as much as half of all Lemhi basin redds occurring between the mouth and the East Fork of Hayden Creek. Although spawning does not appear to be limiting, juvenile migration data suggests poor rearing habitat for early life stages in Hayden Creek. Lower Hayden Creek primarily flows through agricultural land where the channel has been modified and removal of woody debris has altered natural stream processes. The Hayden Creek Hermits Habitat Improvement Project will address limited juvenile rearing habitat through installation of 52 channel structures consisting of anchored and unanchored individual logs, log jams, stumps with rootwads, unanchored boulders, and willow weaves to mimic what would exist with natural conditions. The placement of structures throughout a 1.2 mile reach is expected to create 22 pools in a reach that currently has 3 or 4 slow-velocity pools.

Project Benefit    

Restoration treatments will focus mainly on increasing the amount of instream rearing habitat for juvenile fish species by encouraging overbank flow, accumulation of woody debris for cover, erosion/deposition, and formation of new, low-velocity channel units. Along with this juvenile habitat, restoration treatments will create low velocity pools with overhead cover for adult fish to hold, and recruitment of spawning gravels.

Project objectives identified to reach this goal:

1) Increase the spatial variability of channel depths and velocities preferred by juvenile fish by mimicking natural processes via log structures, loose woody debris, and gravel bar construction (contingent upon accumulation rates).
2) Increase the amount and variety of shelter/cover by adding cover to banks where needed, incorporate small woody material in log structures, and place structures to reduce distance between various cover types (whether existing or constructed).
3) Promote deposition of finer gravel substrate suitable for redd construction by increasing the variety of hydraulic zones (areas of similar depth, flow field, and bed shear stress).


Metric Completed Originally
Instream Habitat
  Stream Miles Treated 1.20

Funding Details

Report Total:$185,459

Project Map


WS 1    

  • Worksite Identifier: WS 1
  • Start Date: 07/01/2020
  • End Date: 08/15/2021
Area Description
Hermits of Mt. Carmel

Location Information

  • Basin: Salmon
  • Subbasin:
  • Watershed:
  • Subwatershed:
  • State: Idaho
  • Recovery Domain: Interior Columbia
  • Latitude: 44.793077
  • Longitude: -113.69923


  • Snake River Basin Steelhead DPS
  • Snake River Spring/Summer-run 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.4 Instream Habitat ProjectY (Y/N)
      •      . . . . C.4.a Instream Habitat Funding
      •      . . . . C.4.b Total length of instream habitat treated
      •      . . . . 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.4 Acres of streambed treated through channel structure placement
        •      . . . . . . C.4.d.5 Pools expected to be created through channel structure placement
        •      . . . . . . C.4.d.6 Yards of average stream-width at mid-point of channel structure placement project (Yards)
        •      . . . . . . C.4.d.7 Number of structures placed in channel