Larson's Reach Floodplain Restoration
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The goal of the project is to restore salmonid spawning, rearing and holding habitat in order to recover self-sustaining salmonid runs to harvestable levels, by addressing limiting factors in the reach. To achieve this goal, this project will seek to improve connectivity with off channel habitat, increase available thermal refuge for salmonids during summer months, and increase key habitat quantity by creating pools associated with logjams as areas of refuge for salmonids. The risk of inaction to the South Fork Early Chinook population is great; the total population has been estimated to be as few as 19 fish. Ensuring that high quality, stable habitat is created as quickly as possible is critical to preserving the South Fork stock. The Larson's Reach Phase 2 In-stream Restoration Project is listed
Notes
- Three PRISM contracts describe work to date:
- Larson Reach Phase 2 In-Stream Restoration 2013 (Lummi Nation) which includes design sheets and the Basis of design report. Feasibility describes 8 feet of channel incision over the last 60 years due to lack of roughness, and proposes a series of ELJ structures to create backwater effects, reconnect side channels, increase channel complexity, and increase river bed aggradation.
- Larson's Bridge Reach Phase 2 Preliminary Design 2012 (Lummi Nation)
- Larson's Bridge Historic Scale Log Jams 2000 (Lummi Nation)
- 2014 construction was focussed on downstream jams including two of type four jams, which are designed to trap bedload resulting in aggredation and an increase in backwater effects. An additional jam was designed to split flow.
- Drone video of project site
