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Category: 2020

  • West Tule Creek Diversion Fish Passage Project

    This project developed engineering designs for a fish-passable irrigation diversion and fish screen on West Tule Creek, a tributary to Hayfork Creek in Trinity County, to restore 1.5 miles of upstream spawning and rearing habitat for Chinook salmon, coho salmon, steelhead, and Pacific lamprey, while also improving instream flows through water transaction and irrigation efficiency upgrades on the Evans Ranch.

  • Strawberry Creek at Clam Beach Fish Passage Project

    This project retrofitted a concrete flood conveyance channel adjacent to the Highway 101 culvert on Strawberry Creek near McKinleyville in Humboldt County by installing 13 angled concrete baffles to create a functional fishway, restoring 5 miles of upstream spawning and rearing habitat for steelhead, coho salmon, coastal cutthroat trout, and lamprey species.

  • Santa Margarita River Fish Passage and Bridge Replacement

    This project replaced a low-flow river crossing at Sandia Creek Drive — the last remaining fish passage barrier on the mainstem Santa Margarita River — with a full-span bridge to restore migration access for endangered Southern California steelhead, opening 12 miles of upstream spawning and rearing habitat approximately two miles north of Fallbrook in San Diego County.

  • Montague-Grenada Weir Retrofit & Barrier Removal

    This project modified the Montague-Grenada Weir — a concrete flow measurement structure on the mainstem Shasta River in Siskiyou County that functioned as a near year-round fish passage barrier — by raising the low-flow sill to eliminate the hydraulic drop while preserving the structure’s water measurement function. The modification improves passage for all life stages of Coho salmon, Chinook salmon, steelhead, and Pacific lamprey at river mile 14.6 on one of California’s historically most productive salmon rivers, a tributary to the Klamath River.

  • Application of FISHPass in the Smith River

    This project applied the FISHPass barrier prioritization tool to the Smith River watershed in Del Norte County, California — the largest undammed river in the state — to develop an optimized list of fish passage barrier removals for the benefit of Coho salmon, Chinook salmon, steelhead, coastal cutthroat trout, and Pacific lamprey. Field verification of 82 sites updated the California Passage Assessment Database and demonstrated the importance of accurate input data for barrier prioritization modeling. Note: FISHPass has since been phased out in favor of the National Barrier Prioritization Tool developed by the NFHP National Aquatic Connectivity Collaborative.

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