Aspinall Unit operations update September 8, 2022: Bumping up to 1400 cfs #GunnisonRiver #ColoradoRiver #COriver #aridification

Black Canyon July 2020. Photo credit: Cari Bischoff

From email from Reclamation (Erik Knight):

Releases from the Aspinall Unit will be increased from 1350 cfs to 1400 cfs on Thursday, September 8th. Releases are being increased due to the hot and dry conditions that have caused the river to drop below the baseflow target on the lower Gunnison River. The actual April-July runoff volume for Blue Mesa Reservoir came in at 68% of average. 

Flows in the lower Gunnison River are currently under the baseflow target of 890 cfs. River flows are expected to be under the baseflow target until the additional release from Crystal Dam arrives. 

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 890 cfs for September. 

Currently, Gunnison Tunnel diversions are 1050 cfs and flows in the Gunnison River through the Black Canyon are around 345 cfs. After this release change Gunnison Tunnel diversions will still be around 1050 cfs and flows in the Gunnison River through the Black Canyon will be near 400 cfs.  Current flow information is obtained from provisional data that may undergo revision subsequent to review.

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