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Ecology Publications & Forms |
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Ecology Publications & Forms |
| Title | Eightmile Dam Rebuild and Restoration EIS Executive Summary |
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| VIEW NOW |
Eightmile Dam Rebuild and Restoration EIS Executive Summary (Number of pages: 50) (Publication Size: 16449KB)
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| Author(s) | Office of the Columbia River | ||||
| Description | Executive Summary for the Final Environmental Impact Statement for the rebuild and restoration of Eightmile Dam. Following the 2017 Jack Creek Fire, Ecology’s Dam Safety Office (DSO) determined the dam was in an unsatisfactory condition, with an estimated 150 downstream residences at risk if the existing dam were to fail, resulting in a High Hazard classification. This hazard classification means that dam failure would threaten human lives and/or cause substantial economic or environmental damage. Because of these concerns, Icicle-Peshastin Irrigation District (IPID) and Chelan County declared an emergency at Eightmile Dam on March 13, 2018. The dam was repaired in 2018 to temporarily increase safety by widening and hardening the spillway and by replacing a segment of the low-level outlet pipe that had collapsed. The infrastructure does not currently meet DSO’s requirements for dam safety or IPID’s water supply needs. As a result of these ongoing safety concerns, DSO is requiring that the dam’s outlet gate be kept open to reduce the volume of water stored and thus reduce risk of failure during the winter and early spring until permanent repairs can be made to the dam. The FEIS was conducted for the rebuild and restoration required to permanently fix Eightmile Dam. The EIS examines significant adverse environmental impacts of three alternatives for rebuilding the dam, as well as the impacts of operating the current dam with no changes. IPID, in coordination with Ecology, has selected Alternative 2 as the preferred alternative for reconstructing the dam. This alternative includes a wide spillway without gates. It will restore the storage capacity of the lake to meet irrigation and storage needs, while minimizing the dam’s visibility to hikers. |
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| Contact | Melissa Downes at 509-454-4259 or Melissa.Downes@ecy.wa.gov | ||||
| Keywords | water storage, water supply, SEPA, environmental impact statement, dam safety | ||||
| WEB PAGE | Eightmile Dam Rebuild and Restoration | ||||
| WATERSHED | Water Resource Inventory Area 45 Wenatchee | ||||
| RELATED PUBLICATIONS | Title:
Eightmile Dam Rebuild and Restoration EIS |
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