Lake Manitoba update: April 22, 2018

Spring is now here as river flows are rising rapidly and for the first time, there are wind effects on the lakes. Lake Manitoba rose slightly this week and will continue rising as the snowmelt accelerates. The current level is 811.64 feet up 0.01 feet from last week. Fairford flows are now rising and are up to 5,032 cfs. Inflow from the Waterhen River is rising rapidly and has reached 3,779 cfs. Flow on the Whitemud River is also up this week to 660 cfs. The level of Lake St. Martin continues to drop quickly and is now 800.70 feet. Lake Winnipegosis is down to 832.28 feet and remains roughly two feet above its long-term average level. Flow on the Assiniboine is rising quickly and is now 3,178 cfs at Holland and 2,472 cfs at Headingly. The Shellmouth Reservoir continued to drop to this week is now 1,390.91 feet. There was an uptick, however, in the reservoir level in the last 24 h.

The Portage Diversion currently remains closed, but the Province has indicated that it will be opened to prevent ice jamming on the lower Assiniboine. The flood update from the Province this week reported:

“The Portage Diversion could start operation in the week of April 23 for ice control along the lower Assiniboine River. Flows along the Assiniboine River at Portage la Prairie could reach just over 20,000 cfs, which would require the use of the Portage Diversion to limit the downstream flow to 12,000 cfs. The Shellmouth Dam will continue operations to reach summer levels after the spring run-off.”

River update
Time: 8:15 AM April 22, 2018
Portage Diversion: closed
Assiniboine at Holland: 3,178 cfs
Assiniboine at Headingly: 2,472 cfs
Waterhen: 3,779 cfs
Whitemud: 660 cfs
Fairford: 5,032 cfs

Lake update
Time: 8:15 AM April 22, 2018
Steep Rock: 811.65 ft
Westbourne: 811.63 ft
Mean level Lake Manitoba: 811.64 ft
Lake Manitoba desired operating range: 810.5 to 812.5 ft

3 thoughts on “Lake Manitoba update: April 22, 2018

  1. I just looked at the gauges this morning (Monday April 23) – the gauge on the Portage Reservoir is now active with water levels rising. That is usually the first step before an opening of the Portage Diversion. – SF


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