Knapp Creek I Diversion -Fish Passage Improvement Design
Salmonid Restoration Planning and Assessments
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| 010 23 SA | | Snake River | | 11/29/0023 | | 06/02/2025 | | 2023 | | Completed | | 07/17/2025 | | |
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Description
The Knapp Creek I diversion, located on Knapp Creek, tributary to Marsh Creek in the Middle Fork Salmon River watershed, impedes fish passage and has degraded channel conditions. Custer SWCD completed a 30% design to remove instream impediments and reconstruct a fish-friendly point of diversion and headgate installation. The 30% design has been reviewed by the landowner, US Forest Service and NOAA Fisheries. Custer SWCD will complete consultation through the Idaho Programmatic and implement the design in 2026. When implemented, the project will improve 14 miles of stream access to Knapp Creek and address the last and only irrigation diversion on Knapp Creek.
Project Benefit
When implemented, project benefits will include improving passage at all life stages for all fish and enhance and extend connectivity in the stream corridor and increase fish passage on Knapp Creek. Water management via Idaho Department of Water Resources and enhanced management under the Salmon-Challis National Forest will result in improvements in the condition of the stream and riparian vegetation and help facilitate the restoration of natural processes in the Knapp Creek watershed. Funding Details |
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| Other | $10,458 |
| Report Total: | $10,458 |
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Worksites
WS-1
- Worksite Identifier: WS-1
- Start Date: 11/29/2023
- End Date: 12/31/2024
Area Description
No Area Description data was found for this worksite.
Location Information
- Basin: Salmon (170602)
- Subbasin: Pahsimeroi (17060202)
- Watershed: Upper Pahsimeroi River (1706020201)
- Subwatershed:
- State: Idaho
- Recovery Domain: Snake River
- Latitude: 44.07641
- Longitude: -113.697004
ESU
- Snake River Basin Steelhead DPS
Map
Photos
Metrics
Metrics
- B.0
Salmonid Restoration Planning and AssessmentsY (Y/N)
- . . B.0.a
Planning And Assessment Funding 40,685.00
- . . B.0.b.1
Area Encompassed .1
- . . B.0.b.2
Stream Miles Affected 14.00
- . . B.1
Restoration Planning And CoordinationY (Y/N)
- . . . . B.1.a
Planning and Coordination funding 40,684.64
- . . . . B.1.b.11
Engineering/design work for restoration projectsY (Y/N)
- . . . . . . B.1.b.11.a
| Name of plan implemented | |
| NMFS 2017. ESA Recovery Plan for Snake River Spring/Summer Chinook Salmon (Oncorhynchus tshawytscha) & Snake River Basin Steelhead (Oncorhynchus mykiss).
United States Fish and Wildlife Service (USFWS). 2015. Upper Snake Recovery Unit Implementation Plan for Bull Trout. |
- . . . . . . B.1.b.11.b
| Description and scope of the plan implemented | |
| Restoration work on this property consists of restoring 0.5 miles of the Knapp Creek creating optimal spawning and rearing habitat for ESA-listed Chinook salmon and steelhead. The design will consist of removing a partial passage barrier from Knapp Creek. Project benefits would include improving passage at all life stages for all fish and enhance and extend connectivity in the stream corridor and increase fish passage, thus reducing entrainment. The Marsh Creek population supports spring-run Chinook and is classified as threatened under the Endangered Species Act (ESA). There are no hatchery-reared salmon released into the Middle Fork Salmon Basin. The Marsh Creek Spring Chinook population is high risk for abundance/productivity and low risk for spatial structure/diversity (NMFS 2017). Low streamflow and entrainment are identified as limiting factors due to the Knapp Creek diversions (NMFS 2017). These actions specifically address at least one limiting factors outlined in Chapter 5 of the recovery plan. |
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