Wyoming Water Supply Outlook--updated May 11, 2010

Below normal mountain snowpack averages across northern and western Wyoming---normal to above normal mountain snowpack averages across central and southeastern Wyoming…

...Near normal to above normal spring and summer runoff volumes area expected across southeastern Wyoming--Below normal spring and summer snowmelt runoff volumes are expected across the rest of Wyoming's major basins...

…Reservoir storages statewide remain at 101 to 124 percent of average…

Mountain snowpack (as of May 1) across Wyoming is generally below normal at 75 to 80 percent of normal. Snowpack "water" numbers and/or snow water equivalent (SWEs) figures at the beginning of May continue to be the highest across southeastern Wyoming--with 90 to 115 percent of normal.  The southern end of the Wind River Basin recorded 100 to 120 percent of normal SWEs by early May.  SWE averages across the rest of Wyoming varied from 54 to 85 percent of normal.

Near normal to above normal (89 to 115 percent) snowmelt streamflow volumes are expected across the major watersheds in southeastern Wyoming--to include the Laramie, the Little Laramie, the Rock Creek, and the Deer Creek Basins.  

Major watersheds across western and central Wyoming, to include the Wind, the Big Horn, the Shoshone, the Powder, and the Tongue Watersheds are expected to continue see below average spring snowmelt streamflow volumes. The Snake, Upper Yellowstone, and Upper Green River Basins are still expected to see well below average spring snowmelt streamflow volumes.

Reservoir storages across Wyoming remain at 101 to 124 percent of average.  Boysen Reservoir is 94 percent full; Pathfinder Reservoir remains at 79 percent of capacity; and Jackson Lake is at 77 percent of capacity.

The latest Wyoming water supply outlook graphic:

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