Text / Upper York Creek Ecosystem Restoration Project, Feasibility Report; Appendix B: Engineering Appendix

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Title: Upper York Creek Ecosystem Restoration Project, Feasibility Report; Appendix B: Engineering Appendix
Creator: U.S. Army Corps of Engineers
Date Created and/or Issued: 2006 August 01
Publication Information: U.S. Army Corps of Engineers, San Francisco District
Contributing Institution: UC Riverside, Library, Water Resources Collections and Archives
Collection: Clearinghouse for Dam Removal Information (CDRI)
Rights Information: Copyrighted
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.
Description: Scope/Content: Abstract: Design alternatives were based on hydraulic and geotechnical analysis. Channel gradients of Alternatives 1, 2A and 2B are designed to maintain a low-erosion flow velocity (approximately 5.09% slope). Alternative 3 has a different slope configuration to accommodate a 145 feet long fish ladder (STA 0+000 to STA 0+300 - 5.09%, STA 0+300 to STA 0+430 -- 23.23% and STA 0+430 to STA 1+100 -- 3.06%) while retaining sufficient energy to minimize sediment deposition and reduce the frequency of maintenance (See Figure 2). Nevertheless, channel gradients of these alternatives may be modified in a future study due to a paucity of bedrock survey data necessary to make a quality DTM file. The proposed trapezoidal channel has a bottom width of 23 feet and 5 feet in depth and either 1.5H : 1V or 2H : 1V side slopes. The excavation angle into the hillsides above the channels ideally would have been 2H: 1V for long term stability, but since the natural hillside slope angles are as steep as 1H: 1V in places, steeper cuts may be necessary (See Figure 3). The benches along the channels will vary to satisfy flood control requirements. The riprap would be placed at the notch of the dam with additional 1 feet of freeboard for both Alt. 2A and Alt. 2B (See Figure 12 and H&H appendix for details). Inclined screw anchors would be required between STA 350 and STA 383 for geotechnical slope stability except Alt 3 (See Geotech. appendix for details). The four primary objectives of this project are: 1. To improve fish passage through Upper York Creek by restoring access to approximately two miles of spawning and rearing habitat for federally listed steelhead and other aquatic wildlife. 2. To restore more natural sediment transport processes along the creek and reduce the risk of uncontrolled sediment releases at Upper York Creek Dam. 3. To restore approximately two miles of degraded riparian and riverine habitat at and above Upper York Creek, removing sediment accumulated behind the dam. 4. To provide aquatic and riparian migration and dispersal connectivity for fish and wildlife populations through the project site. The following alternatives have been chosen to be most feasible for achieving the project objectives.
Scope/Content: Height: 50 Length: 140
Scope/Content: Date constructed: 1900.
Type: text
Form/Genre: digital copy
Identifier: ark:/86086/n20c4v7r
644
Language: English
eng
Subject: Alternative analysis
Dams
Dam retirement
Place: Napa River, CA
York Creek, CA
Upper York Creek Dam
United States

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