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Description
Scope/Content: Abstract: Over the past few decades, steelhead (Oncorhynchus mykiss) populations in southern California have declined to roughly one percent of their historical numbers, and the southern steelhead is now listed as an endangered species. Santa Anita Creek was identified as having the greatest potential for steelhead restoration on the privately-owned Hollister Ranch, located in Santa Barbara County, California. However, a 4.5 meter high dam and seven culverts block access to spawning habitat and have been identified as potential threats to steelhead upstream migration. To provide the Hollister Ranch Owner's Association and the Hollister Ranch Conservancy with steelhead passage restoration options we 1) analyzed the feasibility and consequences of a number of techniques for removing the dam and its impounded sediment, 2) assessed each culvert's impact to fish passage and recommended options for redesign and 3) evaluated the current quality and quantity of spawning and rearing habitat in the creek. We predict that by removing the dam and six culverts Santa Anita Creek would provide 3.2 km of suitable steelhead spawning habitat. We define four dam removal and sediment management options, each with an associated level of risk and cost, for Hollister Ranch to weigh for their steelhead restoration endeavors. Scope/Content: Author affiliation: Donald Bren School of Environmental Science & Management, University of California, Santa Barbara Scope/Content: Dam type: concrete Scope/Content: Height: 4.5 m. Length: 27 m.
Type
text
Identifier
ark:/86086/n208651h 983
Subject
Alternative analysis Ecology and river restoration Fisheries and fish passage Sediment and channel dynamics Dams Dam retirement
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