From email from Reclamation (Erik Knight):
Releases from the Aspinall Unit will be increased from 1600 cfs to 1900 cfs between Wednesday, July 10th and Thursday, July 11th. Releases are being increased in response to declining river flows on the lower Gunnison River.
Flows in the lower Gunnison River have been dropping quickly towards the baseflow target of 1500 cfs. River flows are expected to continue to decline over the next couple weeks.
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 1500 cfs for July and then drops to 1050 cfs in August.
Currently, Gunnison Tunnel diversions are 1050 cfs and flows in the Gunnison River through the Black Canyon are around 600 cfs. After this release change Gunnison Tunnel diversions will still be 1050 cfs and flows in the Gunnison River through the Black Canyon will be near 900 cfs. Current flow information is obtained from provisional data that may undergo revision subsequent to review.