Water Supply Outlook for Alberta

March 2018

Water Supply Forecast as of March 1, 2018 - Oldman River Basin (Natural Flows)

Volume Forecast for March 1 to September 30, 2018
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 2017 Volume as a % of Average
St. Mary River 783,000* 117 102-132 88 64/99 113
Belly River 278,000 120 113-126 108 78/99 98
Waterton River 621,000 113 104-123 95 57/99 117
Oldman River near Brocket 1,257,000 128 117-138 108 70/99 102
Oldman River at Lethbridge 3,588,000 127 116-138 106 73/99 89

 

* - 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