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Province of Manitoba » Water Stewardship » Water Information » Flood Forecasting Reports »
Flood Report for Southern Manitoba - April 24, 2006

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Water Information

FLOOD UPDATE FOR MANITOBA

April 24, 2006.

Water levels still Rising in Some Areas of Western Manitoba

Flood sheets showing present conditions and an updated forecast for: Red River, Riding Mountain & Westlake Area, Pembina River, Assiniboine River and Swan River - The Pas Area are attached.

Weather

  • Little or no rain is expected in Manitoba this week.

Red River

  • Levels of the Red River continue to decline but accurate readings are not available due to strong winds. Levels declined by a quarter foot at most points although a rise was reported Letellier due to the wind. Levels will begin to decline a little faster day by day.

  • The water is still expected to recede from PTH 75 north of Morris by May 2 with favourable weather.

  • The Red River level in downtown Winnipeg this morning was 18.10 feet, a slight decline since yesterday. Levels in the city are expected to remain between 17.5 and 18.5 feet for the next two weeks.
  • The flow in the Red River Floodway was measured this morning at 30,250 cubic feet per second (cfs) while the flow upstream of the floodway inlet was 77,240 cfs.

 Assiniboine River

  • The Assiniboine River is still within its banks from Virden to Winnipeg due to operation of flood control works. Flooding of valley lands continues from Shellmouth Dam to Miniota due to increased outflows from Shellmouth Reservoir and local runoff from last Tuesdays rainstorm. Minor flooding will develop from Virden to Grand Valley in the next few days. Additional rises will occur from Shellmouth Dam to Brandon in the next few weeks as higher flows arrive from the Shellmouth area.
  •  The water level in Shellmouth Reservoir this morning was 1408.65 feet, just above the spillway elevation of 1408.5 feet. The reservoir inflow is now at its crest but the reservoir water level will continue to rise until early May when it will crest near 1412 feet.
  • Manitoba Water Stewardship, in consultation with the Shellmouth Reservoir Regulation Liaison Committee, is planning to operate the reservoir to minimize the peak outflow. Controlled conduit outflows will be maintained at 2500 cfs until the total of conduit and spillway flows reaches 4500 cfs. The controlled conduit flow will then be reduced day by day to maintain a total outflow of 4500 cfs if possible. Reservoir and river conditions as well as forecasts are being reviewed day by day.
  • Flooding is not expected in Brandon with the possible exception of low lying areas at Curren Park. Locations from Brandon to Winnipeg will experience only minor rises as the river remains well within the banks.
  • The flow in the Portage Diversion this morning was 4060 cfs while the inflow to Portage Reservoir was near 9120 cfs.
  • Flooding of low-lying agricultural lands along the Shell River will continue for several weeks. The crest of the Shell River has now reached the Inglis area.

Pembina River

  • Significant flooding continues on the Pembina River from Rock Lake to Windygates, but levels continue to decline. Flooding should be limited to the portion from Rock lake to Swan Lake by the middle of next week.

  • Water levels at Gretna and at the Aux Marais crossing at the international boundary fell 0.3 feet since yesterday but this estimate is affected by wind.  The United States National Weather Service is expecting the level to decline close to two feet at Neche by May 1.

Carrot and Saskatchewan Rivers

  • The level of the Saskatchewan River at The Pas continues to decline very slowly and no further rise is expected with favourable weather.
  • Levels of the Carrot River from the Saskatchewan boundary to just west of The Pas rose less than 0.2 feet since yesterday. Additional rises should be less than a quarter foot with the crest expected in the next few days. Only minor flooding is expected at rural areas from the Saskatchewan boundary near The Pas with no flooding at The Pas.
  • Agricultural lands in the Pasquia River Valley near The Pas continue to be flooded and pumping continues to reduce levels. The flooding is much less than that of last summer.

Red Deer River

  • A record high crest on the Red Deer River has now reached Manitoba and levels will begin to decline tomorrow. The river crested in eastern Saskatchewan several days ago at flows nearly twice as great as previous record highs. Levels are two to three feet above historical records. Landowners along the river have been advised to take appropriate actions to protect property.
  • The level on Red Deer Lake is not well known since the gauge is no longer being read due to serious flooding of the area. The last reading yesterday afternoon was 867.6 which is 2.6 feet higher than the crest of 1979. Strong north winds yesterday caused strong wave action, resulting in some dike failures. Most resident of the community of Red Deer Lake have departed as the access road is now severely flooded and closed to traffic.
  • It is expected that the Lake will crest during the middle of this week. It will take several weeks before levels decline sufficiently to permit access.

 

 

Hydrologic Forecast Centre,
Water Branch,
Manitoba Water Stewardship

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