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Condition Reports
High Water Conditions and Control Structure Operations for Southern Manitoba
July 16, 2007
Highlights:
The High Water Level Advisory for the Pembina River watershed has ended.
A High Water Level Advisory continues for some Whiteshell area Lakes.
The high water level advisory issued for the Pembina River last week is now ended. All tributaries have crested and Rock Lake is now at its crest. The Lake only rose to 1332.75 feet, which is less than what had been predicted. Runoff appears to have been reduced due to the effect of heavy vegetation which slows down runoff and allows more water to infiltrate the soil. Also the rain was not particularly intense as it did not come from thundershowers. While flows in the Pembina River will be about 10 times the July normal for the next few weeks, flooding is not expected with the possible exception of a few low-lying areas.
Red River:
Levels of the Red River held steady or rose slightly last week due to a heavy rain last Monday, however began to decline again on the weekend and should continue to decline based on the dry weather forecast for this week.
The level of the Red River in downtown Winnipeg has declined to 8.3 feet this morning, which is just below the level of the Forks walkways.
Assiniboine River:
Levels of the Assiniboine River continue to decline. The river is within its banks from Shellmouth to Winnipeg.
Shellmouth Reservoir:
Reservoir Water Level----1409.13 feet (decline of 0.48 feet past 4 days)
Inflow----580 cfs
Spillway Flow---300 cfs
Conduit Flow----1300 cfs (increased from 1000 cfs at 11:30 a.m. today)
Operating Plan: Outflows will be maintained between 1500 and 1600 cfs until the Reservoir level declines to 1405.5 feet, then decreased slowly.
Whiteshell Area Lakes:
White Lake, Jessica Lake, Betula Lake, Big Whiteshell Lake & Lone Island Lake are still near record high levels for July but are declining slowly. With dry weather this week, levels are expected to decline more rapidly.
A bog jam at White Lake was partially removed last week but appears to have grown again. Further removal will be attempted in the next few days.
Two logs were removed from White Lake and Jessica Lake July 12 and two logs were replaced at Brereton Lake on July 13. Parks staff continues to monitor lake levels regularly. Dams will be operated as required to achieve desirable levels as soon as possible.
Other Levels:
Record high levels continue on Lake Winnipegosis. Level today is 833.60 feet.
Levels of Lake Winnipeg (714.98), Lake Manitoba (812.50) and Lake St. Martin (800.95) are all near the top of their operating ranges.
