From email from Reclamation (Erik Knight):
In response to the forecast for low flows on the San Juan River, the Bureau of Reclamation has scheduled an increase in the release from Navajo Dam from 350 cubic feet per second (cfs) to 450 cfs for August 12th 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 recommends a target base flow of between 500 cfs and 1,000 cfs through the critical habitat area. The target base flow is calculated as the weekly average of gaged flows throughout the critical habitat area from Farmington to Lake Powell.