Navajo Reservoir

Navajo Dam

Current Status

Last Updated: May 7th, 2021

***Notices for the latest release changes are posted here. Email sbehery@usbr.gov or call 970-385-6560 for questions***

Navajo Reservoir On May 6th, the daily average release rate from Navajo Dam was 500 cfs while reservoir inflow was averaging approximately 1,580 cfs. The water surface elevation was 6034.3 feet above sea level. At this elevation the live storage is 1.052 maf (62 percent of live storage capacity) and the active storage is 0.391 maf (38 percent of active storage capacity). NIIP is diverting 530 cfs.  The San Juan-Chama project is currently diverting 320 cfs from the basin above the reservoir.  The river flow measured at the Animas River at Farmington USGS gage was at 280 cfs. River flow at the San Juan River at Four Corners USGS gage was 670 cfs.


Releases from Navajo Dam are made for authorized purposes of the Navajo Unit and are pursuant to the Record of Decision for the Navajo Reservoir Operations. Releases target the San Juan River Recovery Implementation Program's recommended downstream baseflow range of 500 cfs to 1,000 cfs through the critical habitat reach of the San Juan River (Farmington, NM to Lake Powell).  Current modeling shows the release will most likely vary between 350 and 600 cfs to accomplish this for the remainder of spring. The current calculated weekly baseflow average is 726, which is within the recommended range.


Navajo was at 6033.5 ft of pool elevation and 1,044,597 acre-ft of storage by the end of April, which was 78 percent of average for the end of the month. The release averaged 530 cfs (as measured at the USGS San Juan at Archuleta gage) and totaled 31 kaf, which was 46 percent of average for the month.  Preliminary modified unregulated inflow (MUI) into Navajo was 81kaf, which was 51 percent of average for the month.  Calculated evaporation for the month was 2 kaf.   Navajo had a net storage gain of 2.3 kaf in April.

The most probable MUI forecast for May, June, and July is 145 kaf (52 percent of average), 75 kaf (34 percent of average), and 24 kaf (36 percent of average), respectively. 

The April-July runoff forecasts are as follows:
Min Probable: 265 kaf (36 percent of average, a decrease of 5 kaf since the last forecast)
Most Probable: 325 kaf (44 percent of average, a decrease of 45 kaf since the last forecast)
Max Probable: 410 kaf (56 percent of average, a decrease of 140 kaf since the last forecast)

Based on the current storage levels and inflow forecast, there is no planned spring peak release this year.

Reclamation conducts Public Operations Meetings three times per year to gather input for determining upcoming operations for Navajo Reservoir. Input from individuals, organizations, and agencies along with other factors such as weather, water rights, endangered species requirements, flood control, hydro power, recreation, fish and wildlife management, and reservoir levels, will be considered in the development of these reservoir operation plans. In addition, the meetings are used to coordinate activities and exchange information among agencies, water users, and other interested parties concerning the San Juan River and Navajo Reservoir. The next meeting will be held virtually on Tuesday, August 24th, at 1:00 PM.

Susan Behery
sbehery@usbr.gov

Contact

Please contact the Operations Group via e-mail at ResourceMgr@usbr.gov for additional information.

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Last Updated: 5/7/21