Aspinall Unit operations update: Releases bumping down, 600 cfs through Black Canyon #GunnisonRiver #ColoradoRiver #COriver #aridification

Black Canyon National Park July 2020. Photo credit: Claire Codling/The Department of Interior

From email from Reclamation (Erik Knight):

Releases from the Aspinall Unit will be decreased from 1675 cfs to 1610 cfs on Saturday, August 7th. Releases are being decreased to bring flows in the lower Gunnison River closer to the baseflow target while still providing the additional release volume under the emergency provision of the Drought Response Operations Agreement (DROA). The April-July runoff volume for Blue Mesa Reservoir came in at 47% of average.

Flows in the lower Gunnison River are currently above the baseflow target of 890 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 890 cfs for August and September.

Currently, Gunnison Tunnel diversions are 1040 cfs and flows in the Gunnison River through the Black Canyon are around 660 cfs. After this release change Gunnison Tunnel diversions will still be around 1040 cfs and flows in the Gunnison River through the Black Canyon will be near 600 cfs. Current flow information is obtained from provisional data that may undergo revision subsequent to review.

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