Navajo Dam operations update: Releases to decrease to 400 cfs July 27, 2021 #SanJuanRiver #ColoradoRiver #COriver

Since the late 1980’s, this waterfall formed from interactions among reservoir levels and sedimentation that redirected the San Juan River over a 20-foot high sandstone ledge. Until recently, little was known about its effect on two endangered fishes. Between 2015-2017, more than 1,000 razorback sucker and dozens of Colorado pikeminnow were detected downstream of the waterfall. Credit: Bureau of Reclamation

From email from Reclamation (Susan Novak Behery):

In response to increasing flows in the critical habitat reach, the Bureau of Reclamation has scheduled a decrease in the release from Navajo Dam from 500 cubic feet per second (cfs) to 400 cfs on Tuesday, July 27th, 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 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.

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