2021 April-July snowmelt forecast for Bighorn River Basin

(Fremont County, WY) — The Bureau of Reclamation released their updated forecast for April through July runoff 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 939,000 acre-feet (af), which is 74% of the 30-year average of 1,262,200 af.
  • Buffalo Bill Reservoir – Shoshone River April through July inflow to Buffalo Bill Reservoir is forecast at 700,000 af, which is 93% of the 30-year average of 749,000 af.
  • 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.
  • Bull Lake Reservoir – April through July snowmelt runoff into Bull Lake Reservoir from Bull Lake Creek is expected to be 120,000 af, which is 83% of the 30-year average of 144,000 af.
  • 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.

For additional information on Buffalo Bill, Boysen, and Bull Lake Reservoirs, contact Wyoming Area Manager Carlie Ronca at 307-261-5671.

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