Effects of River Delta Restoration on Salmon Populations
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This page summarizes evidence about the effects of Restoration efforts at River Deltas on Salmon populations. It describes Monitoring and Research associated with a large body of River Delta Restoration. Work in the Skagit River Delta by SRSC and NOAA has resulted in long-term datasets supported in part by the Intensively Monitored Watersheds program. Additional effort in the Snohomish Estuary, work surrounding the Nisqually Refuge Restoration, and work in the Stillaguamish River Delta have added additional data points. Monitoring in the Nooksack River Delta] has also allowed for additional comparisons. These sections can be built out, and at some point could be moved to new pages.
Habitat Use
- Greene & Beamer 2005 skagit delta recovery plan analysis is an early analysis that set the trajectory for IMW work in the Skagit.
- Beamer et al 2024 landscape determinants of estuary habitat use chinook salmon - presents a synthesis of habitat use among multiple estuaries in Puget Sound, comparing results from the Nooksack, Skagit, Stillaguamish, Snohomish and Nisqually.
Post Restoration Habitat Use
A wide variety of resources point to rapid use of newly inundated habitats by juvenile salmonids... See River Delta Restoration Monitoring
Habitat Connectivity
- Automating Landscape Connectivity for Puget Sound River Deltas and Pocket Estuaries - develops a standard measure of landscape connectivity for all River Deltas.
- Juvenile salmon response to landscape connectivity change within two Puget Sound river estuaries - tests connectivity hypothesis by monitoring change in density following change in connectivity in the Skagit and Stillaguamish.
Density Dependence
- Puget Sound Large River Delta Tidal Restriction and Wetland Mapping
- Snohomish Delta Ecosystem Monitoring and Evaluation
- Tide gate effects analysis
Juvenile To Adult Ratio
Tidal Fish Passage
- Tidal Fish Passage & Connectivity is an effort by WDFW to evaluate fish movement in estuary habitats with deliverables anticipated in 2024.
Tide Gate Effects on Salmonid Passage and Utilization describes information on the effects of tide gates.
Efforts and Products in Salmon, River Delta, and Restoration
Efforts
- Automating Landscape Connectivity for Puget Sound River Deltas and Pocket Estuaries
- Effects of Exposed Tidal Flats on Water Temperature in the Snohomish Estuary
- Evaluating Salmon Rearing Limitations in River Deltas
- Snohomish Delta Ecosystem Monitoring and Evaluation
- Snohomish Estuary Restoration Effects on Temperature, Salinity, and Tides
- Tide gate effects analysis
Products
8 documents in Salmon,River Delta and Restoration- Beamer 2016 fisher slough restoration effectiveness
- Beamer et al 2006 deepwater slough effectiveness
- Beamer et al 2013 fisher slough fish monitoring 2011
- Beamer et al 2013 fisher slough fish monitoring 2012
- Cornu et al 2008 large wood placement in tidal wetlands
- David et al 2014 chinook salmon foraging nisqually after restoration
- Hall et al 2019 DRAFT snohomish monitoring plan
- Snohomish County 2020 smith and mid-spencer monitoring year 0-1
