(Submitted by Dr. Scott Forbes)
Calm winds give us a good look at lake levels right now, and it is clear that with another dry week, the lakes have resumed their decline. Lake Manitoba is down to 810.35 feet, down 0.05 feet, 0.15 feet below the bottom end of the desired operating range. The temperatures are warm enough for evaporation to continue, which lowers the lake level. Outflow at Fairford River is now a trickle at just 554 cfs. Inflow from the Waterhen River is also low at 1,589 cfs. Lake Winnipegosis is down from last week at 829.61 feet. Flow on the Whitemud River has nearly stopped at just 11 cfs. Lake St. Martin is unchanged from last week 796.40 feet, well below the lower end of the desired operating range of 797.0 feet. Flow on the Dauphin River is down to 812 cfs this week. Flow on the Assiniboine is down to 512 cfs at Holland and is up a bit to 660 cfs at Headingly. The level of the Shellmouth Reservoir is down on the week to 1400.14 feet.
River update
Time: September 26, 2021
Portage Diversion: closed
Assiniboine at Holland: 512 cfs
Assiniboine at Headingly: 660 cfs
Waterhen: 1,589 cfs
Whitemud: 11 cfs
Fairford: 554 cfs
Dauphin: 812 cfs
Lake update
Time: September 26, 2021
Steep Rock: 810.37 ft
Westbourne: 810.34 ft
Mean level Lake Manitoba: 810.35 ft
Lake Manitoba desired operating range: 810.5 to 812.5 ft
Lake St. Martin: 796.40 ft
Lake St. Martin desired operating range: 797.0 to 800.0 ft
Lake Winnipegosis: 829.61 ft
Shellmouth Reservoir: 1400.14 ft
Extracted from the Environment and Climate Change Canada Real-time Hydrometric Data web site (https://wateroffice.ec.gc.ca/mainmenu/real_time_data_index_e.html) on September 26, 2021.
Association of Lake Manitoba Stakeholders 