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Fontenelle Dam
Fontenelle Dam was built between 1961 and 1964 on the Green River in southwestern Wyoming. The high zoned earthfill dam impounds the Fontenelle Reservoir. The dam and reservoir are the central features of the Seedskadee Project of the U.S. Bureau of Reclamation, which manages the Fontenelle impoundment primarily as a storage reservoir for the Colorado River Storage Project. The dam suffered a significant failure in 1965, when the dam's right abutment developed a leak. Emergency releases from the dam flooded downstream properties, but repairs to the dam were successful. However, in 1983 the dam was rated "poor" under Safety Evaluation of Existing Dams (SEED) criteria, due to continuing seepage, leading to an emergency drawdown. A concrete diaphragm wall was built through the core of the dam to stop leakage.
==Use==
Initially conceived as a storage reservoir for irrigation water, the project was suspended for a time in 1962 to pursue a study of high-altitude irrigation methods. The results of the studies caused the cancellation of many irrigation features for the project. The primary project rationale evolved to support Wyoming water rights in the Colorado River basin, retaining water that would otherwise go downstream to states in the lower Colorado basin. The dam provides power generation as a secondary feature.〔(【引用サイトリンク】url=http://www.usbr.gov/projects/Project.jsp?proj_Name=Seedskadee%20Project )〕〔(【引用サイトリンク】url=http://www.usbr.gov/projects/Facility.jsp?fac_Name=Fontenelle%20Dam )〕 One motivation for the deferral of irrigation activities was the discovery of trona in the southern portion of the proposed irrigated region. As the extraction of trona was a higher-value activity, the removal of those lands from the project made the irrigation project nonviable.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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