From email from Reclamation (Erik Knight):
Releases from the Aspinall Unit will be decreased from 1450 cfs to 1350 cfs on Thursday, September 15th. Releases are being decreased due to the cooler and wetter conditions that have caused the river to rise above the baseflow target on the lower Gunnison River. The actual April-July runoff volume for Blue Mesa Reservoir came in at 68% of average.
Flows in the lower Gunnison River are currently above the baseflow target of 890 cfs. River flows are expected to remain 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 890 cfs for September.
Currently, Gunnison Tunnel diversions are 1050 cfs and flows in the Gunnison River through the Black Canyon are around 440 cfs. After this release change Gunnison Tunnel diversions will still be around 1050 cfs and flows in the Gunnison River through the Black Canyon will be near 340 cfs. Current flow information is obtained from provisional data that may undergo revision subsequent to review.