Aspinall Unit operations update

Aspinall Unit dams

From email from Reclamation (Erik Knight):

The May 15th forecast for the April – July unregulated inflow volume to Blue Mesa Reservoir is 825,000 acre-feet. This is 122% of the 30 year average. Blue Mesa Reservoir current content is 681,000 acre-feet which is 82% of full. Current elevation is 7502.4 ft. Maximum content at Blue Mesa Reservoir is 829,500 acre-feet at an elevation of 7519.4 ft.

Based on the May 1st forecast, the Black Canyon Water Right peak flow target is listed below:

Black Canyon Water Right

The peak flow target is equal to 6,427 cfs for a duration of 24 hours.

The shoulder flow target is 831 cfs, for the period between May 1 and July 25.

The May 15th forecast of 825,000 af is now in the Average Wet category and the Aspinall Unit ROD flow targets have changed. Based on the May 15th forecast, the flow targets are listed below:

Aspinall Unit Operations ROD

The year type is currently classified as Average Wet.

The peak flow target is 14,040 cfs and the duration target at this flow is 2 days.

The half bank-full target is 8,070 cfs and the duration target at this flow is 20 days.

The spring peak operation has reached peak release level. The release increase made this morning, May 24th, should result in the first day of flows > 14,000 cfs at the Whitewater gage, arriving by the afternoon of May 25th. Today, flows in the Gunnison River through the Black Canyon have reached 11,500 cfs. The current rate of release is planned to continue through Sunday, May 28th. At this time it is projected that there is additional water that needs to be released from the Aspinall Unit to prevent overfilling at Blue Mesa Reservoir, therefore the peak release is continuing to meet more than the 2 day duration target.

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