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<br />, ,. ,,-~ -.:-- -........-- -- , <br />/ " <br />, . . . <br /> . <br /> , <br /> <br />GJ-150 <br /> <br />United States Department of the Interior <br />BUREAU OF RECLAMATION <br />UPPER COLORADO REGION <br />GRAND JUNCTION PROJECTS OFFICE <br />1',0, BOX 60340 <br />2764 COMPASS DRIVE <br />GRAND JUNCTION, COLORADO 81506 <br /> <br /> <br />- <br />- <br /> <br />- <br />. <br /> <br /> <br />JUN - <br /> <br /> <br />~! !G, <br />\. . - - ,{ ~ <br />~y~ ~ . <br />-,~ 0-<0,\.{i~ <br />S ~~-o <br />~'0'" G~G((; <br /> <br />Mr. Gene Jencsok <br />Colorado Water Conservation Board <br />1313 Sherman Street, Room 823 <br />Denver CO 80203 <br /> <br />Subject: May 1992 Test Flows for the Gunnison River (Endangered Species, <br />River Flows) <br /> <br />Dear Mr, Jencsok: <br /> <br />Enclosed for your information are preliminary flow readings for the Gunnison <br />River during the period May 9 through May 26, 1992, when releases were made <br />from the Wayne N, Aspinall Unit to create a spring peak flow through the Black <br />Canyon of the Gunnison National Monument and downstream. <br /> <br />Two graphs show average and maximum daily flows at the Gunnison River below <br />the Gunnison Tunnel and the Gunnison River near Grand Junction (upstream from <br />Redlands Diversion), The detailed tables show the hourly flow changes through <br />the Monument and can be used to review flow ramping rates. <br /> <br />Peak flows during the period near Grand Junction were around 5,500 cubic feet <br />per second (cfs), It should be noted that higher peaks occurred following the <br />test due to increased runoff from rainfall. For example, flows reached 6,600 <br />cfs near Grand Junction on May 28 (flows below the Gunnison Tunnel were around <br />900 cfs on May 26-28), This shows the difficulty in planning to match peaks <br />of different tributaries in the Gunnison River. <br /> <br />If you have any questions on this information, please call Steve McCall at <br />(303) 248-0638, <br /> <br />~4U <br /> <br />For Ronald Johnston <br />Projects Manager <br /> <br />Enclosures <br /> <br />cc: Mr. Pat Sanderson <br />Western Area Power Administration <br />1800 South Rio Grande Avenue <br />Montrose CO 81401-4800 (w/encI) <br />