Reclamation issues May 2021 snowmelt forecast for Bighorn River Basin

(Fremont County, WY) – The Bureau of Reclamation released their May forecast for the April through July runoff prediction in the Bighorn River Basin.

In Fremont County, the Bighorn River Basin includes Boysen Reservoir, Bull Lake Reservoir, and the Wind River. Reclamation’s updated forecast is below.

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Bighorn Lake – Bighorn River April through July inflow to Bighorn Lake is forecast to be approximately 984,000 acre-feet (af), which is 78% of the 30-year average of 1,262,200 af. Approximately 149,000 af of the forecast volume was accumulated during April, which is 84% of the April average.

Buffalo Bill Reservoir – Shoshone River April through July inflow to Buffalo Bill Reservoir is forecast at 600,000 af, which is 80% of the 30-year average of 749,000 af. Approximately 40,000 af of the forecast volume was accumulated during April, which is 86% of the April average.

Boysen Reservoir – Wind River April through July inflow to Boysen Reservoir is forecast at 450,000 af, which is 72% of the 30-year average of 621,400 af. Approximately 41,700 af of the forecast volume was accumulated during April, which is 82% of the April average.

Bull Lake Reservoir – April through July snowmelt runoff into Bull Lake Reservoir from Bull Lake Creek is expected to be 125,000 af, which is 87% of the 30-year average of 144,000 af. Approximately 3,000 af of the forecast volume was accumulated during April, which is 74% of the April average.

Wind River – April through July snowmelt runoff into the Wind River above Bull Lake Creek is expected to be 350,000 af, which is 80% of the 30-year average of 437,600 af. Approximately 25,000 af of the forecast volume was accumulated during April, which is 93% of the April average.


For additional information on Buffalo Bill, Boysen, and Bull Lake Reservoirs, contact Wyoming Area Manager Carlie Ronca at 307-261-5671. For additional information on Yellowtail Reservoir, contact Montana Area Manager Ryan Newman at 406-247-7298.

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