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The United States Geological Survey

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The United States Geological Survey

Post by Guest on Thu Sep 30, 2010 9:46 pm

The United States Geological Survey (USGS) operates a number of stream gauges along the Colorado River. A gauge on its middle course, at Lee's Ferry, 16 miles (26 km) below Glen Canyon Dam, recorded an average discharge of 17,850 cubic feet per second (505 m3/s) between 1895 and 2009. The maximum flow recorded at this station was 220,000 cubic feet per second (6,230 m3/s) on June 18, 1921. The minimum flow was 700 cubic feet per second (20 m3/s), January 23–24, 1963, resulting from the construction of Glen Canyon Dam.[5] The mean annual discharge recorded by downriver gauges are all lower than at the Lee's Ferry gauge, and includes 13,860 cubic feet per second (392 m3/s) below Hoover Dam,[9] 14,190 cubic feet per second (402 m3/s) below Davis Dam,[10] 12,040 cubic feet per second (341 m3/s) below Parker Dam,[11] 1,724 cubic feet per second (49 m3/s) below the Laguna Diversion Dam,[12] and 1,988 cubic feet per second (56 m3/s), for 2008–2009, at the Northerly International Boundary (NIB) with Mexico, 1.1 miles (1.8 km) above Morelos Dam. This NIB gauge has operated since 1950 and is, via the International Boundary and Water Commission, the accounting point for the 1944 International Treaty detailing water delivery to Mexico.[13]





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