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Draft Environmental Assessment for Upper York Creek Ecosystem Restoration Project, Napa County, California
U.S. Army Corps of Engineers
Date Created and/or Issued
Publication Information
U.S. Army Corps of Engineers, San Francisco District
Contributing Institution
UC Riverside, Library, Water Resources Collections and Archives
Clearinghouse for Dam Removal Information (CDRI)
Rights Information
Transmission or reproduction of materials protected by copyright beyond that allowed by fair use requires the written permission of the copyright owners. Works not in the public domain cannot be commercially exploited without permission of the copyright owner. Responsibility for any use rests exclusively with the user.
Scope/Content: Abstract: The Upper York Creek Ecosystem Restoration Project is located within the five-square mile York Creek drainage basin, to the northwest of the City of St. Helena, Napa County, approximately 60 miles north of San Francisco. York Creek is a tributary of the Napa River and flows in an easterly direction through a narrow canyon before joining the Napa River northeast of the city of St. Helena in Napa County, at an elevation of approximately 225 ft. A 2005 Salmonid Habitat Report by the Napa County Resource Conservation District found that overall, York Creek is one of the most significant spawning and rearing streams for steelhead within the Napa Basin. Specifically, the upper reaches of York Creek offer excellent rearing and spawning habitat, and creating access to these areas would greatly benefit the overall steelhead population. York Creek has also been designated as critical habitat for threatened Central California Coast steelhead by the National Marine Fisheries Service. The Upper York Creek Dam (Upper St. Helena Dam) has been identified as a significant obstacle to passage for steelhead in the threatened Central California Coast Evolutionary Significant Unit. The removal or breeching of Upper York Creek Dam would open approximately 2 miles of suitable upstream habitat for steelhead. The proposed project would remove the majority of Upper York Creek Dam and the accumulated sediment, restore York Creek from just below the dam to just above the sediment basin, and restore roughly 2 acres of aquatic and riparian habitat with native vegetation. The proposed project would meet the following objectives: (1) Improve fish passage for the for steelhead in the York Creek watershed by reconnecting spawning, rearing, and migratory aquatic habitat from downstream of the dam to approximately 2 miles upstream; (2) reduce future downstream habitat degradation and fish kills caused by uncontrolled sediment releases; (3) restore approximately 2 acres of riparian and riverine habitat at and above Upper York Creek Dam and; (3) provide aquatic and riparian migration and dispersal connectivity for fish and wildlife populations through the project site.
Scope/Content: Height: 50 Length: 140
Scope/Content: Date constructed: 1900.
digital copy
Alternative analysis
Dam retirement
Napa River, CA
York Creek, CA
Upper York Creek Dam
United States

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