Wyoming Water Supply Outlook--updated March 10, 2010

Below normal mountain snowpack across Wyoming…

...Below normal spring and summer runoff volumes expected over a majority or Wyoming's major watersheds...

…Reservoir storages statewide remain at 100 to 104 percent of average…

Mountain snowpack 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 March continue to be the highest across southeastern Wyoming--with 78 to 83 percent of normal.  SWEs across the rest of Wyoming varied from 57 to 83 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, and the Rock Creek Basins.  

Major watersheds across western and central Wyoming, to include the Snake, the Upper Yellowstone, the Wind, and the Big Horn Watersheds, are expected to continue see below average spring snowmelt streamflow volumes. 

Reservoir storages across Wyoming remain at 100 to 104 percent of average.  Boysen Reservoir is 80 percent full; Pathfinder Reservoir is at 72 percent of capacity; and Jackson Lake is at 74 percent of capacity.

The latest Wyoming water supply outlook graphic:



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