Aspinall Unit operations update: Lower Gunnison streamflow above baseflow target

Fog-filled Black Canyon via the National Park Service

From email from Reclamation (Erik Knight):

Releases from the Aspinall Unit will be decreased by 100 cfs on Thursday, October 12th. Diversions to the Gunnison Tunnel will be reduced by 100 cfs on Wednesday, October 11th so there will be a short period of flows over 1000 cfs in the Gunnison River through the Black Canyon before the river returns to a flow of 950 cfs by late Thursday morning.

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 October through December.

Currently, diversions into the Gunnison Tunnel are near 975 cfs and flows in the Gunnison River through the Black Canyon are around 950 cfs. After this release change Gunnison Tunnel diversions will be about 900 cfs and flows in the Gunnison River through the Black Canyon will still be around 950 cfs. Current flow information is obtained from provisional data that may undergo revision subsequent to review.

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