Aspinall Unit operations update: 550 CFS in the Black Canyon, diversions through the Gunnison Tunnel = 300 CFS

Sunrise Black Canyon via Bob Berwyn

From email from Reclamation Erik Knight:

Releases from the Aspinall Unit will be increased to 1050 cfs on Wednesday, March 25th. Releases are being adjusted to accommodate the change in diversions to the Gunnison Tunnel, which will occur on Thursday, March 26th. Snowpack in the Upper Gunnison Basin is currently at 106% of normal. The March 15th runoff forecast for Blue Mesa Reservoir predicts 78% of average for April-July inflows. 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 January through March.

Currently, Gunnison Tunnel diversions are at 300 cfs and flows in the Gunnison River through the Black Canyon are around 400 cfs. After this release change Gunnison Tunnel diversions will be at 500 cfs and flows in the Gunnison River through the Black Canyon will be around 550 cfs. Current flow information is obtained from provisional data that may undergo revision subsequent to review.

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