Aspinall Unit operations update June 7, 2023 #GunnisonRiver #COriver #aridification

Aspinall Unit dams

From email from Reclamation (Erik Knight):

The June 1st forecast for the April – July unregulated inflow volume to Blue Mesa Reservoir is 845,000 acre-feet. This is 133% of the 30 year average. Snowpack in the Upper Gunnison Basin peaked at 138% of average. Blue Mesa Reservoir current content is 625,000 acre-feet which is 75% of full. Current elevation is 7496 ft. Maximum content at Blue Mesa Reservoir is 828,00 acre-feet at an elevation of 7519.4 ft. 

High flows along tributaries downstream of the Aspinall Unit helped with meeting the Aspinall Unit ROD targets on the lower Gunnison River as measured at the Whitewater gage. Releases to meet ROD targets were lower than expected and with the increase in the runoff forecast there is now a need to increase releases from the Aspinall Unit.  

Therefore ramp up of releases from the Aspinall Unit will begin on Wednesday, June 21st, with the peak release being achieved by Tuesday, June 27th. The timing of the peak release will be coordinated with required spillway gate inspections at Morrow Point Dam. The full schedule of releases from Crystal Dam with estimated Gunnison River flows is shown in the table below. 

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