Navajo Reservoir – The current (July 4th) release rate from Navajo Dam is 1050 cfs and the observed inflow to Navajo Reservoir is 220 cfs (click for recent daily data). The Navajo Indian Irrigation Project (NIIP) is diverting 670 cfs. The reservoir elevation is 6043.1 feet which corresponds to a live storage of 1.147 maf (67 percent of live storage capacity). This elevation also corresponds to an active storage of 0.485 maf (47 percent of active storage capacity). The river flow measured at the San Juan River at Four Corners USGS gage is 580 cfs. River flow at the Animas River at Farmington USGS gage is at 10 cfs. Releases from Navajo Dam are made for the authorized purposes of the Navajo Unit, and pursuant to the 2006 Record of Decision, 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 (SJRIP) 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. The target base flow is calculated as the weekly average of gaged flows throughout the critical habitat area. See all public notices here.
Preliminary modified-unregulated inflow into Navajo in June was 5,819 af, which was 3 percent of average for the month. Modified-unregulated inflow to Navajo over the next three months (July, August, and September) are projected to be: 4,000 af (6 percent of average), 25,000 af (55 percent of average), and 25,000 af (58 percent of average), respectively.
The April-July modified-unregulated inflow runoff forecasts are as follows:
Min Probable: 165,000 af (22 percent of average, an increase of 4,000 af since the last forecast)
Most Probable: 168,000 af (23 percent of average, a decrease of 6,000 af since the last forecast)
Max Probable: 179,000 af (24 percent of average, a decrease of 12,000 af since the last forecast)
Releases for the remainder of the summer will be made to maintain the minimum target baseflow in the critical habitat reach and will likely range between 700 and 1,100 cfs.
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 Navajo Public Operations Coordination Meeting is scheduled for Tuesday, August 21st 2018, at 1p.m. at the Farmington Civic Center, Farmington, NM.
July 5th, 2018
Please contact the Operations Group via e-mail at ResourceMgr@usbr.gov for additional information.
Last Updated: 7/13/18