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Laramie-Poudre Tunnel
The Laramie-Poudre Tunnel is an early transmountain tunnel in the U.S. state of Colorado. The tunnel transfers water from the west side of the Laramie River basin, which drains to the North Platte River, to the east side Cache la Poudre River basin that drains to the South Platte River. The tunnel is about long with variable diameters with a minimum diameter of about . The diameter varied due to the different material mined through and the erosion of almost 90 years of water flow. It is located at about elevation with about a 1.7 degree down slope. The Laramie River lies about higher than the Cache La Poudre River at this location〔Height of Tunnel entrance-exit () Accessed 6 Sep 2011〕 separated only by a mountain ridge. The Laramie-Poudre Tunnel is located about west-northwest of Fort Collins, Colorado, about south of the Wyoming border and about north of Rocky Mountain National Park. It was built between 1909 and 1911 to convey water from the Laramie River to the Poudre River for Front Range irrigation. Court battles between Colorado and Wyoming over water rights prevented operation until 1914 (Case 1995).
As a result of the court battles the tunnel is restricted to a maximum of 9.9 cubic m/s of water from the Laramie river instead of its designed 22.9 cubic m/s. Most of the flow occurs during the peak snow melt season of mid May to Mid July. The Laramie-Poudre Tunnel typically transfers about 14,000 acre ft (17,300,000 cubic meters) from the Laramie River basin to the Cache La Poudre Basin. Agriculture users typically use about 450,000 acre ft and municipal users use a further 75,000 acre ft in the Cache La Poudre drainage basin.〔Cache La Poudre river flow () Accessed 7 Sep 2011〕
In the spring of 2000 after almost 90 years of use, part of the tunnel collapsed, requiring extensive rebuilding of part of the tunnel. This rebuild cost $4,500,000 and took from November 2000 to May 16, 2001.〔Laramie-Poudre Tunnel 2000 Repairs () Accessed 6 Sept 2011〕
Greeley, Colorado's partnered with North Weld County Water and Fort Collins-Loveland Water District to purchase the Laramie Poudre Tunnel in 2006.〔Laramie Poudre Tunnel Purchase () Accessed 7 Sep 2011〕
== References ==
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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