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River Flow Advisory

Water and Power Resources Service Upper Region Salt Lake City,

Vol. ll, tfo 2 Ma 1980

The May 1 snow measurements and forecasts indicate.that inflows into are 141 % of normal. This will mean, among other things, that Lake Powell will probably fill for the first time. It will also assure ample water for river boating in the of the Colorado and its principal tributaries.

Here are the forecasts for flows below dams operated by the Water and Power Resources Service:

COLORADO RIVER ABOVE LAKE POWELL

Colorado River at Westwater - The flow is now 22,000 cfs and is expected to reach about 46,000 cfs around the first of June.

Cataract Canyon (including the Green River) - The flow is now 35,000 cfs and is expected to peak at approximately 85,000 cfs around the first of June.

LAKE POWELL

Lake Powell, now at elevation 3,680 feet, is expected to fill to elevation 3,700 feet by next July. The lake is rising at l/2 foot per day.

COLORADO RIVER THROUGH

Because Lake Powell will probably fill, more water than usual will be released this spring. Also, it is certain that tributary inflow below Dam wil 1 be higher than normal. The minimum release (between midnight and 7 a.m.) wil 1 be 3,000 cfs.·

UPPER GREEN RIVER - The reservoir is at elevation 6,489 feet. The present release of 1700 cfs will be increased as the inflow increases. The inflow is expected to be about normal.

GREEN RIVER FLOWS BELOW

The reservoir is now at 6,002 feet and is expected to increase to 6,023 feet by next summer. Releases are expected to be normal this spring and summer. Page Two

GREEN RIVER AT GREEN RIVER, UTAH

The Green River is flowing at 13000 cfs. The flow is expected to peak at approximately 42000 cfs around the first of June.

SAN JUAN RIVER FLOWS

Current releases (3000 cfs) are being gradually decreased to 1200 cfs. The flow at Bluff, which is now 7000 cfs is expected to peak to 18000 cfs around the first of June. Navajor Reservoir is at an elevation of 6049 and is expected to raise approximately 5 feet of it 6085 capacity during the summer.

GUNN I SON RI VER

Blue Mesa Reservoir - The reservoir is now at elevation 7,461 feet. The reservoir is expected to fill by next August.

~OR FURTHER INFORMTION ON RESERVOIRS AND RELEASES -

Call the Upper Colorado Regional Office in Salt Lake City Telephone numbers (801) 524-5571 or 524-5573,

FOR CURRENT INFORMATION ON RIVER FLOWS -

Call the National Weather Service River Forecast Center, Salt Lake City - Telephone number (801) 524-5130