Aspinall Unit operations update (September 24, 2022): 340 cfs in Black Canyon #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 decreased from 1350 cfs to 1250 cfs on Saturday, September 24th. Releases are being decreased due to the cooler and wetter conditions that have decreased demand at the Gunnison Tunnel. The actual April-July runoff volume for Blue Mesa Reservoir came in at 68% of average. 

Flows in the lower Gunnison River are currently above the baseflow target of 890 cfs. River flows are expected to remain above the baseflow target for the foreseeable future. 

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 340 cfs. After this release change Gunnison Tunnel diversions will be around 950 cfs and flows in the Gunnison River through the Black Canyon will still be near 340 cfs.  Current flow information is obtained from provisional data that may undergo revision subsequent to review. 

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