Text / Technical Alternatives Analysis to Provide Fish Passage at Embrey Dam

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Technical Alternatives Analysis to Provide Fish Passage at Embrey Dam
Alternative Title
Senate Document No. 18
Virgina Department of Game and Inland Fisheries
Date Created and/or Issued
Publication Information
Commonwealth of Virgina, Richmond
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: Embrey Dam is a 22' high concrete structure located just east of the interstate 95 crossing of the Rappahannock River. The dam currently blocks anadromous fish from migrating upstream to more than 70 miles of the upper sections of the river. Virginia Senate Joint Resolution No. 296 was approved in early 1997 requesting the Virginia Department of Game and Inland Fisheries to conduct a study on the recommended methods of providing fish passage at Embrey Dam. As a part of the study undertaken by the Virginia Department of Fame and Inland Fisheries, TIMMONS, Inc. has been contracted to evaluate the technical feasibility of three previously identified alternatives for providing fish passage. The technical alternatives considered include: constructing a vertical slot fishway, breaching a portion of the dam, and removing the entire dam. To fully evaluate these options for providing fish passage, a "decision matrix" strategy was developed dividing the critical issues into technical, regulatory, and "local" categories. Issues that could be assigned specific capital and/or maintenance costs were included within a "technical decision matrix" to develop the recommendations outlined within this study. Local issues that resulted from various meetings held with federal, state, and local agencies provided input to create a "local decision matrix" of issues that have been identified for further study. The partial and complete dam removal alternatives require that the sediment that has accumulated behind the dam be addressed/ Options to address the sediment issue include full removal/ hauling of the sediment off-site, and various combinations of removal, release, and stabilization of the sediment in place. This following financial analysis utlizes a conservative cost estimate of $4.24 million for full sediment removal to independently evaluate the three alternatives for providing fish passage.
Scope/Content: Height: 22
digital copy
Alternative analysis
Dam retirement
Rappahannock River, VA
Embrey Dam
United States

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