#ColoradoRiver: Aspinall Unit operations update #COriver

Aspinall Unit
Aspinall Unit

From email from Reclamation (Erik Knight):

Releases from Crystal Dam will be increased from 1850 cfs to 2000 cfs on Friday, July 15th. Flows in the lower Gunnison River have been dropping quickly over the last week and are now just under the baseflow target. This increase is intended to raise flows in the lower Gunnison River as well as manage the reservoir content to reach the end of year winter target elevation. The current April-July runoff forecast is now at 91% of average. The current content of Blue Mesa Reservoir is 796,000 acre-feet which is 96% full.

Flows in the lower Gunnison River are currently below the baseflow target of 1500 cfs. This increase should restore flows to a level at or above the baseflow target.

Pursuant to the Aspinall Unit Operations Record of Decision (ROD), the baseflow target in the lower Gunnison River, as measured at the Whitewater gage, is 1500 cfs for July.

Currently, diversions into the Gunnison Tunnel are around 1050 cfs and flows in the Gunnison River through the Black Canyon are around 850 cfs. After this release change Gunnison Tunnel diversions will still be at 1050 cfs and flows in the Gunnison River through the Black Canyon should be around 1000 cfs. Flows in the river may be less than 1000 cfs if the maximum capacity of the Crystal powerplant proves to be less than 2000 cfs. Current flow information is obtained from provisional data that may undergo revision subsequent to review.

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