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Scroll below to view representative examples of our work |
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Humboldt Bay National Wildlife Refuge, Salmon Creek Fish Habitat Restoration |
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A connection between Hookton Slough (right side of top image) and Salmon Creek (left) was restored with the construction of a new tide gate in an existing levee. The process of levee excavation and tide gate construction is depicted by images on this page. The replacement of the existing structure with a “fish friendly” structure increased tidal circulation in lower Salmon creek, thereby improving fish passage for adults and juveniles into and out of the lower creek, while improving water quality conditions upstream of the tide gates. These adjustable new gates allow greater quantities of tidewater to enter the estuary during each flooding tide. This muted tide cycle, by virtue of tidal scouring and water conveyance, enlarges the size of the estuary and substantially improves sediment routing and water quality. These adjustable new gates also allow increased overall outflow capacity of Salmon Creek, thereby reducing velocities at the tide-gates and restoring hydraulic scour by routing larger flows. Construction and installation of the new tide gates was performed by Nehalem Marine. Funding for this project was provided by the CDFG California Coastal Salmon Recovery Program, US Fish and Wildlife Service Coastal Program, and the California Coastal Conservancy.
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Building the concrete structure of the new tide gate. |
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Three views of the completed Nehalem Marine tide gate. |
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Projects: Estuarine Restoration |
