Category: 2018

Neefus Gulch Wood and Fish Passage at Appian Way

This project developed engineering plans for replacing a failing road crossing on Neefus Gulch — a tributary to the North Fork Navarro River in Mendocino County — with a stream simulation arch culvert, and for installing 14 large wood structures to arrest an active knickpoint in a severely incised 1,600-foot channel reach. The designs were part of a broader restoration effort that also removed an upstream earthen dam. Subsequent monitoring documented 10 coho salmon redds and two steelhead redds, including in reaches where salmon had not spawned for over 70 years.
Mid Klamath Fish Passage Improvement Project

This ongoing annual project deploys trained crews each summer to assess and manually treat fish passage barriers at the mouths of up to 72 priority tributaries to the Klamath, Salmon, and Lower Scott Rivers across Humboldt and Siskiyou Counties. Barriers including debris jams, boulder cascades, and perched alluvial deltas are modified using hand tools to create step-pool fishways, and brush bundles installed to enhance thermal refugia. The project benefits coho salmon, Chinook salmon, and steelhead, with over 80% of treated sites showing documented increases in salmonid presence post-treatment by 2022.
Davy Brown and Munch Creek Fish Passage Engineering Project

This project completed final engineering designs for the removal of three concrete low-water crossings on Davy Brown and Munch Creeks, tributaries to Manzana Creek within Los Padres National Forest in Santa Barbara County. One Munch Creek crossing will be removed and channel restored; two Davy Brown crossings will be replaced with stream-spanning bridges. The work will open approximately 3.1 miles of additional habitat in the Sisquoc River watershed — a Core 1 recovery priority — for federally endangered Southern California steelhead.