Reclamation issues snowmelt forecast and expected operations for North Platte River Basin

Media Contact: Shane Hayden, 307-261-5647,

For Release: May 10, 2019

MILLS, Wyoming - The Wyoming Area Office of the Bureau of Reclamation in Mills, Wyoming, has prepared the May snowmelt runoff forecasts and operating plans for the North Platte River Basin.

“Based on this month’s projection of above average runoff, we expect the North Platte Basin water contractors will have a full water supply this year," said Wyoming Area Manager, Carlie Ronca.

The May forecasts indicate the spring snowmelt runoff will be above average. Total April through July runoff in the North Platte River Basin above Glendo Dam is expected to be 1,004,000 acre-feet (af) which is 111% of the 30-year average. Approximately 228,500 af of the forecast volume was accumulated during April, which is 151% of the April average.

As of April 30, storage content in the North Platte Reservoirs amounts to 1,822,745 af, which is 110% of the 30-year average. The total conservation storage capacity of the North Platte Reservoir System is approximately 2.8 million af.

Current releases are 2,700 cubic feet per second (cfs) from Seminoe Reservoir through the Miracle Mile, 500 cfs out of Gray Reef Reservoir, and 930 cfs out of Guernsey Reservoir. Based on current projections for the months of May, June, and July, the releases out of Seminoe Reservoir are not expected to exceed 3,000 cfs, while flows out of Gray Reef are expected to be in the range of approximately 500 to 2,500 cfs. Releases from Guernsey will be in the 2,900 to 5,200 cfs range. Pathfinder Reservoir is not expected to spill this spring.

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The Bureau of Reclamation is a federal agency under the U.S. Department of the Interior and is the nation's largest wholesale water supplier and second largest producer of hydroelectric power. Our facilities also provide substantial flood control, recreation opportunities, and environmental benefits. Visit our website at and follow us on Twitter @USBR.