Water Supply Outlook for Alberta

November 2015

Recorded March 1 to September 30, 2015 Natural Runoff Volumes - Oldman River Basin (Natural Flows)

2015 Recorded Volumes
March 1 to September 30
2015 Forecast Volumes
Locations Volume in dam3 Volume as a
% of Average
Ranking (lowest to highest) Average difference between Forecast and Recorded natural volumes
St. Mary River 529,000** 79 18/99 13%
Belly River 185,000* 80 15/99 17%
Waterton River 432,000* 79 18/99 12%
Oldman River near Brocket 774,000* 79 22/99 10%
Oldman River at Lethbridge 1,982,000* 70 17/99 17%

* - Recorded 2015 natural volumes are preliminary and subject to change
** - This value is the natural volume and includes the U.S. share

Average is based on the period 1981 to 2009

Ranking is based on the period 1912 to 2009


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