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    Water Supply Outlook: Popo Agie River Drainage at 70 percent of median; Wind River Drainage running at 71 to 90 percent

    (Riverton, Wyo.) – December 2018 precipitation totals across Wyoming were 85 to 90 percent of average. Precipitation numbers varied between 210 percent of normal over the Belle Fourche River Drainage (northeast Wyoming) to near 60 percent of average over the Sweetwater/Lower North Platte River Basin (central-east central Wyoming). Current water year (October-December 2018) precipitation across Wyoming was 90 to 100 percent of average.

    Mountain snowpack across Wyoming was 85 to 95 percent of median by the middle of January.  Snowpack “water” numbers and/or Snow Water Equivalents were the highest across basins in southeast Wyoming—varying between 95 to 105 percent of median.  SWEs across basins in western Wyoming were 70 to 85 percent of median.

    Below normal (80 to 90 percent) snowmelt streamflow volumes are expected across several major basins across Wyoming. Above average snowmelt streamflow volumes are expected across isolated portions of the Tongue, Powder, and Shoshone Watersheds.  The Wind, Big Horn, and Upper North Platte Basins are forecasted to have below normal streamflow volumes during the upcoming snowmelt season.

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    Wyoming reservoirs are averaging 70 to 75 percent of capacity in early January. Reservoirs storages across Wyoming are above average at 105 to 115 percent for January.

    Note:  Due to staff shortages and the government shutdown,  there are some forecasted flow numbers in the graphic that are missing.

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