Streamflows across Wyoming during the runoff were above to well above normal. Streamflow trends into the summer and into early fall were normal to slightly above normal.
The above average runoff---and even record runoff at several watersheds---quickly filled many major reservoir across Wyoming. However, due to the dry summer and early fall, many reservoirs showed significant decreases in storages by the end of the irrigation season. Even so, reservoir storages across Wyoming in water year 2010 remained slightly above water year 2009 reservoir storages. Most importantly, the big reservoirs (Boysen, Seminoe, and Pathtfinder) have kept storages at greater than 70 percent of capacity.
Bottom line is that current precipitation trends (during the last 4 months) have caused short-term hydrologic condition concerns. However, current water supply and streamflow trends are not pointing to any development of another significant long-term hydrologic drought. Wyoming is the 5th driest state in the country--so drought is always ‘knocking-on’ on Wyoming’s backdoor.
For the complete drought report with graphics (in .PDF format)--- Please go to:
for additional drought graphics and information---please refer to:
For the complete drought report with graphics (in .PDF format)---
Please go to: