Aspinall Unit operations update: 490 cfs in Black Canyon #GunnisonRiver #ColoradoRiver #aridification

Black Canyon July 2020. Photo credit: Cari Bischoff

From email from Reclamation (Erik Knight):

Releases from the Aspinall Unit will be increased from 1450 cfs to 1500 cfs on Wednesday, July 20th. Releases are being increased to maintain flows above the baseflow target on the lower Gunnison River. The forecasted April-July runoff volume for Blue Mesa Reservoir is 67% of average.

Flows in the lower Gunnison River are currently very near to the baseflow target of 900 cfs. River flows are expected to drop below the baseflow target without this additional increase in release from the Aspinall Unit.

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 900 cfs for June, July and August.

Currently, Gunnison Tunnel diversions are 1030 cfs and flows in the Gunnison River through the Black Canyon are around 440 cfs. After this release change Gunnison Tunnel diversions will still be around 1030 cfs and flows in the Gunnison River through the Black Canyon will be near 490 cfs. Current flow information is obtained from provisional data that may undergo revision subsequent to review.

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