April Wyoming Water Supply Update

March precipitation over many of the major watersheds across Wyoming was near normal to above normal. In fact, precipitation totals across the the Big Horn (141% of average), Powder (214% of average),and Tongue (125% of average) were much above average. The Upper Yellowstone and Snake Drainages recorded much below average (only 40% of average) precipitation during March.

Snow water equivalents (SWEs) in the Wyoming mountain snowpack remained 65 to 75 percent of average throughout March.  However, SWEs across the Powder and Tongue Watershes increased to near 100 percent of normal by the end of the month.

Snowmelt streamflow volumes are expected to be below normal across a majority of watersheds in Wyoming.  Near normal snowmelt streamflow volumes are forecasted for the Tongue Basin and for portion of the Powder Basin. 

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