From email from Reclamation (Susan Novak Behery):
In response to decreasing flows in the critical habitat reach, and a declining flow forecast, the Bureau of Reclamation has scheduled an increase in the release from Navajo Dam from 300 cubic feet per second (cfs) to 500 cfs for Monday, June 13th, 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). This release change is calculated as the minimum required to maintain the target baseflow.
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.