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Scope/Content: Abstract: The objective of this study was to document the presence of steelhead trout(Oncorhynchus mykiss irideus) in the Sisquoc River watershed with particular emphasis on documentation of any large, sea-run, adult steelhead that may have remained in the system following connectivity between the Santa Maria River and the ocean during the high winter flows of 2004/2005. Conducting snorkeling surveys for adult steelhead that may have elected to oversummer or were trapped in the watershed provided an important opportunity to document anadromy in the system and also to assess the population dynamics of juveniles in variable reaches of the watershed. In addition, a significant steelhead migration impediment under the Garey Bridge near Sisquoc was recently removed improving upstream steelhead migration conditions. The first scheduled revision to the Twitchell Dam Water Control Manual (WCM) since steelhead were listed as an endangered species is reportedly in progress and steelhead migration flow and recovery discussions should benefit from the data collected in this study.
Fisheries and fish passage Dams Dam retirement
Davy Brown Creek, CA Manzana Creek, CA Rattlesnake Creek, CA Sisquoc River, CA Twitchell Dam United States