Aspinall Unit update: The Gunnison Tunnel to turn on Tuesday

Gunnison Tunnel via the National Park Service
Gunnison Tunnel via the National Park Service

From email from Reclamation (Erik Knight):

Releases from Crystal Dam will be increased from 500 cfs to 600 cfs on Tuesday, March 31st at 9:00 AM. This release increase is in response to the start of diversions into the Gunnison Tunnel. On Tuesday morning, the Gunnison Tunnel will begin diverting 200 cfs. The current forecast for April-July unregulated inflow to Blue Mesa Reservoir is 590,000 acre-feet which is 87% 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 March and April.

Currently, diversions into the Gunnison Tunnel are zero and flows in the Gunnison River through the Black Canyon are around 500 cfs. After this release change Gunnison Tunnel diversions will be around 200 cfs and flows in the Gunnison River through the Black Canyon should be around 400 cfs. Current flow information is obtained from provisional data that may undergo revision subsequent to review.

More Aspinall Unit coverage here.

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