From email from Reclamation (Andrew Limbach):
May 20, 2026
The Aspinall Unit spring peak operation has been tentatively scheduled for Wednesday, May 27th. A final notification of the release schedule will be sent out that will include time of day ramped releases.
Pursuant to the Black Canyon Decree section 31.5.2.1 for peak flows during a “dry” hydrologic year the Black Canyon will have a 24-hour peak flow of 730 cfs.
The purpose of this release is to satisfy the Black Canyon Decree spring release. Due to the maintenance outage ending on May 20th and unseasonably early peak runoff of the North Fork, this spring peak release timing was chosen to coincide with equal or greater inflows to Blue Mesa Reservoir.
Contact Andrew Limbach (alimbach@usbr.gov or 970-248-0644) for more information regarding Aspinall operations or the Operation Group meeting.
