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Monticello Dam is a high concrete arch dam in Napa County, California, United States constructed between 1953 and 1957. The dam impounded Putah Creek to create Lake Berryessa, currently the seventh largest man-made lake in California. Water from the reservoir primarily supplies agriculture in the Sacramento Valley downstream. The dam is noted for its classic, uncontrolled morning-glory type spillway.〔 The diameter at the lip is . Locally, the spillway is also known as 'The Glory Hole'.〔(【引用サイトリンク】title=Morning Glory Spillway )〕 To the south is Putah Creek State Wildlife Area. ==Statistics== Although the dam and its long reservoir are located entirely in eastern Napa County, the dam lies less than west of the boundary with Yolo County. In addition, parts of the lake's watershed extend into Lake County. Monticello is a concrete medium thick arch dam high from the foundations, long and above the riverbed. The dam is thick at the base, tapering to at the crest. The total volume of construction materials is . The capacity of the reservoir is , with a full surface area of . The maximum operating elevation is ; any higher water levels will flow over the dam's spillway. About of runoff flow into the reservoir each year from its watershed. The Monticello Dam Powerplant was completed in 1983 and has three generators, totaling a capacity of 11.5 megawatts (MW). The powerplant is operated and maintained by the Solano Irrigation District. The electrical power is sent mostly to the North Bay area of San Francisco. As of 1992, about , or nearly 75 percent, of the project command area was irrigated. Water is diverted downstream of Monticello at the Putah Diversion Dam, and distributed to farms through the Putah South Canal. The canal ends at Terminal Reservoir, which supplies water to the city of Vallejo. A 1999 contract provides for the delivery of of water each year for irrigation. About of municipal water are also supplied by the project. Since construction the dam and reservoir have prevented about $5,015,000 in flooding related damages.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Monticello Dam」の詳細全文を読む スポンサード リンク
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