Wyoming Water Supply Outlook--updated April 19, 2010

Below normal mountain snowpack across Wyoming…

...Below normal spring and summer runoff volumes continue to be expected over a majority of Wyoming's major watersheds...

…Reservoir storages statewide remain at 99 to 108 percent of average…

Mountain snowpack (as of April 1) across Wyoming is generally below normal at 70 to 75 percent of normal. Snowpack "water" numbers and/or snow water equivalent (SWEs) figures at the beginning of April continue to be the highest across southeastern Wyoming--with 80 to 87 percent of normal.  SWEs across the rest of Wyoming varied from 59 to 86 percent of normal.

Near normal (94 to 100 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 expected to see well below average spring snowmelt streamflow volumes.

Reservoir storages across Wyoming remain at 98 to 108 percent of average.  Boysen Reservoir remains 80 percent full; Pathfinder Reservoir remains at 72 percent of capacity; and Jackson Lake is at 75 percent of capacity.

The latest Wyoming water supply outlook graphic:

 



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