Water Supply Outlook for Alberta

May 2017

Water Supply Forecast as of May 1, 2017 - Oldman River Basin (Natural Flows)

Volume Forecast for March 1 to September 30, 2017
Locations Volume in dam3 Volume as a % of Average Probable Range as a % of Average Potential Minimum as % of Average Forecast Ranking (lowest to highest) Recorded March-September 2016 Volume as a % of Average
St. Mary River 850,000* 127 117-142 109 75/99 84
Belly River 280,000 121 112-132 105 78/99 88
Waterton River 647,000 118 109-127 101 63/99 90
Oldman River near Brocket 1,266,000 129 118-152 108 70/99 66
Oldman River at Lethbridge 3,653,000 129 118-141 107 76/99 66

 

* - This value is the natural volume and includes the U.S. share

Average is calculated for the March 1 to September 30 period from 1981 to 2009

 
NOTE: There is: a 50% chance that the actual natural flow will fall within the probable range given; a 25% chance that the actual flow will be less than the lower bound of the probable range given; and a 10% chance that the actual natural flow will be less than the potential minimum. Actual day to day streamflow conditions may vary throughout the season as a result of the effects of streamflow diversion and reservoir storage.

For technical enquires about this web page please contact Alberta Environment - Environmental Management Water Management Operations Branch at AENV-WebWS@gov.ab.ca