Aspinall Unit operations update: 825 cfs through Black Canyon

Looking downstream from Chasm View, Painted Wall on right. Photo credit: NPS\Lisa Lynch

From email from Reclamation (Erik Knight):

Releases from the Aspinall Unit will be increased by 250 cfs on Wednesday, May 1st. This will bring flows in the Gunnison River through the Black Canyon up to shoulder flow levels, as described in the decree for the Black Canyon water right. The current forecast for the April-July runoff volume for Blue Mesa Reservoir is 860,000 AF of inflow, which is 127% of average. Flows in the lower Gunnison River are currently above the baseflow target of 1050 cfs. River flows are expected to stay 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 1050 cfs for April and May.

Currently, diversions into the Gunnison Tunnel are 675 cfs and flows in the Gunnison River through the Black Canyon are around 575 cfs. After this release change Gunnison Tunnel diversions will still be 675 cfs and flows in the Gunnison River through the Black Canyon will be around 825 cfs. Current flow information is obtained from provisional data that may undergo revision subsequent to review.

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