Navajo Dam operations update (November 2, 2021): Releases bumping down to 300 cfs #SanJuanRiver #ColoradoRiver #COriver #aridification

The outflow at the bottom of Navajo Dam in New Mexico. Photo: Brent Gardner-Smith/Aspen Journalism

From email from Reclamation (Susan Novak Behery):

In response to decreasing irrigation and increasing flows in the critical habitat reach, the Bureau of Reclamation has scheduled a decrease in the release from Navajo Dam from 350 cubic feet per second (cfs) to 300 cfs for Tuesday, November 2nd, 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. Due to low storage and forecast levels in WY 2022, the minimum release of 250 cfs, as documented in the Navajo Record of Decision (2006), may be implemented this winter as long as that release can satisfy the target baseflow.

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