Aspinall unit operations update (March 30, 2022): 300 cfs through the #Gunnison Tunnel #GunnisonRiver

Black Canyon July 2020. Photo credit: Cari Bischoff

From email from Reclamation (Erik Knight):

Releases from the Aspinall Unit will be decreased from 775 cfs to 700 cfs on Wednesday, March 30th. Releases are being decreased as flows in the lower Gunnison River are well above the baseflow target. Currently snowpack in the Upper Gunnison Basin is 109% of normal and the forecasted April-July runoff volume for Blue Mesa Reservoir is 92% of average.

Flows in the lower Gunnison River are currently above the baseflow target of 790 cfs. River flows are expected to stay at levels 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 790 cfs for March and 1050 cfs for April.

Currently, Gunnison Tunnel diversions are 300 cfs and flows in the Gunnison River through the Black Canyon are around 475 cfs. After this release change Gunnison Tunnel diversions will still be around 300 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.

Aspinall Unit

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