From email from Reclamation (Susan Behery):
In response to a cooler forecast and increasing tributary flows, the Bureau of Reclamation has scheduled a decrease in the release from Navajo Dam from 850 cubic feet per second (cfs) to 800 cfs on Saturday, September 12th, starting at 4:00 AM. Releases are made for the authorized purposes of the Navajo Unit, and to attempt to maintain a target base flow through the endangered fish critical habitat reach of the San Juan River (Farmington to Lake Powell).
The San Juan River Basin Recovery Implementation Program has recommended flows in the critical habitat reach as close to 500 cfs as possible for the summer of 2020. This is within their normal recommended range of 500 to 1,000 cfs. This target base flow is calculated as the weekly average of gaged flows throughout the critical habitat area from Farmington to Lake Powell.
This scheduled release change is subject to changes in river flows and weather conditions. If you have any questions, please contact Susan Behery (firstname.lastname@example.org or 970-385-6560), or visit Reclamation’s Navajo Dam website at https://www.usbr.gov/uc/water/crsp/cs/nvd.html