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| type = Reservoir | basin_countries = United States | inflow = Sage Creek, Chiles Creek, Moore Creek, Conn Creek | outflow = Conn Creek〔 | catchment = 〔 | length = | width = | area = 〔 | depth = | max-depth = | volume = 〔 | residence_time = | shore = | elevation = 〔 | islands = | cities = }} Lake Hennessey is a man-made lake in the hills east of St. Helena, California, U.S.A.. The lake is formed by Conn Creek Dam, built in 1948 across Conn Creek. Construction of the earthen dam was authorized by the United States Congress when it passed the Flood Control Act of 1944 in order to mitigate flooding downstream in Napa, California.〔http://www.countyofnapa.org/Pages/DepartmentContent.aspx?id=4294968277 County of Napa Flood Control District〕 Funding for the dam was never appropriated by Congress, so in 1946 the City of Napa took on the project and built it at a cost of $550,000 dollars plus $250,000 for the land. The cost of laying the diameter pipeline from the dam to the city of Napa was $1.7 million. The 30 miles of pipe for the project was manufactured at the Basalt Rock Company plant located south of Napa. The design of the dam did not include a way to drain water from the reservoir when it comes close to full capacity. Once the lake is full, water drains from a spillway causing potential flooding dangers downstream. The reservoir and pipelines are maintained by Napa, and it is the primary source of water for the city. When the reservoir reaches its capacity, outflow reaches San Pablo Bay by way of Conn Creek, which feeds the Napa River.〔http://www.napanow.com/chronhist.html/Napa Napa Now〕 The lake was named after Edwin R. Hennessey. Hennessey was a local civic leader who played a role in the development of the Conn Valley reservoir. == Conn Creek Dam == Conn Creek Dam is an earthen dam high and long containing of material. Its crest is above sea level. It is owned by the City of Napa. 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「Lake Hennessey」の詳細全文を読む スポンサード リンク
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