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Flood Report - April 11, 2019

Posted: April 11, 2019

 Flood Report for Manitoba
April 11, 2019


Flood Watch*:                    - Roseau River
Flood Warning*:                - Red River, from Emerson to the Red River Floodway Channel Inlet
Summary
  • All flow and water level information is based on data available at 7:00 am. Flood sheets with updated information will be posted later today at https://gov.mb.ca/mit/floodinfo/#forecasts_reports.
  • The weather system affecting the USA portion of the Red River basin has shifted north slightly and is expected to bring up to 45 cm (18 inches) of wet snow today and tomorrow, with highest amounts in the south. The forecasted snowfall from this precipitation has been accounted for in the forecast for the Red River. Most of the precipitation yesterday occurred outside of the Red River basin.
  • PR 204 has been closed west of PR 212, including the bridge connecting Selkirk and East Selkirk, because of high water levels. A partial ring dike closure at Morris is anticipated to occur on approximately April 18 and will result in the closure of PTH 75 North of Morris. For detours and road closures please call 511 or visit www.manitoba511.ca.
  • Any questions or concerns about flood mitigation should be directed first to the municipal authority (call the Municipal Office at 204-338-0306 or by email to info@weststpaul.com). Questions about forecasts, water levels, provincial waterways, or provincial water control infrastructure can be directed to 204-945-1165 or by email to floodinfo@gov.mb.ca.
Weather
  • The weather system affecting the USA portion of the Red River basin has shifted north slightly and is expected to bring up to 45 cm (18 inches) of wet snow today and tomorrow, with highest amounts in the south. The forecasted snowfall from this precipitation has been accounted for in the forecast for the Red River. Most of the precipitation yesterday occurred outside of the Red River basin.
  • A smaller weather system is expected hit much of southern Manitoba early next week but is forecasted to bring only 5-10 mm of precipitation.
Red River Basin
  • The forecasted precipitation in the USA portion of the Red River basin has been factored into Manitoba’s most recent forecast. In general, this precipitation event increased the forecasted peak slightly, closer to 2011 levels, and delayed the forecasted peak by a day or two. The additional volume of water may also slightly increase the duration of the flood event.
  • Water levels on the main stem of the Red River in Manitoba continue to rise. The Red River at Emerson rose 1.2 feet and at Morris by 1.4 feet in the last 24 hours.
  • Provincial crews are deployed in a number of communities in the Red River Valley preparing for potential ring dike closures and pumping operations to facilitate internal drainage. Partial ring dike closures are currently underway at Emerson and at St. Jean Baptiste, and the communities will remain accessible by road. Partial ring dike closures are also expected at Morris, Letellier, Ste. Agathe, and St. Adolphe. A partial ring dike closure at Morris is anticipated to occur on approximately April 17 and will result in the closure of PTH 75 North of Morris.
  • Based on the revised forecast, the Red River Floodway is expected to begin operations after the weekend but may be delayed until ice is flowing freely at the Floodway control structure. Rising water levels at the Floodway Inlet may result in some water spilling naturally into the Floodway Channel prior to operation.
  • The water level at James Ave in Winnipeg is 13.9 feet and, with operation of the Red River Floodway and provincial water control structures, is projected to peak at approximately 18.5-19 feet in late April. Ice is moving through the city with ice jams occurring at some locations but no problems have been reported.
  • PR 204 has been closed west of PR 212, including the bridge connecting Selkirk and East Selkirk, because of high water levels.
Roseau River
  • Water levels on the Roseau River continue to rise. The forecast has been reassessed to account for the winter storm in the USA portion of the basin, a peak flow of 3,800 cfs (110 cms) is expected April 20-22.
Assiniboine River Basin
  • The Shellmouth Dam reservoir water level is at 1394.2 feet and the reservoir is rising towards the target water level range. Inflows to the reservoir are approximately 2,060 cfs (58 cms) and outflows are 25 cfs (0.7 cms).
  • The current flow down the Portage Diversion is 460 cfs (13 cms). The Portage Diversion continues to be operated to limit flows on the Lower Assiniboine to less than 5,000 cfs (140 cms) to manage ice while it is still in place downstream. Crews continue to monitor ice conditions on this section of the river.
  • Generally, flows and water levels upstream of Portage la Prairie have peaked and are beginning to decline. However, fluctuations to Portage Reservoir inflows and Portage Diversion flows are expected to continue occurring over the next several days as ice upstream of Portage La Prairie continues to break up.
Interlake Region
  • Flows on the Icelandic and Fisher Rivers are low, with water levels at most points on the rivers stable or beginning to decline.
  • Outflow from Lake Manitoba is approximately 3,090 cfs (90 cms) through the Fairford River Water Control Structure.
Manitoba Lakes
  • Generally, greater than 90% ice coverage is reported on larger Manitoba lakes, some smaller lakes in southern Manitoba, such as Pelican, Rock and Oak Lakes, have lost more ice, with approximately 2/3 of ice coverage remaining.
  • The water levels on Manitoba’s major lakes are relatively stable and within normal or desirable ranges. Today’s water levels are as follows:
    • Lake Winnipegosis       831.8 feet
    • Lake Manitoba:            811.5 feet at Steep Rock
    • Lake St. Martin:            799.4 feet
    • Lake Winnipeg:            712.9 feet
    • Dauphin Lake:              854.5 feet
*Definitions
  • Flood Warning: A flood warning is issued when river or lake levels are exceeding or are expected to be
    exceeding flood stage within the next 24 hours.
    Flood Watch: A flood watch is issued when river or lake levels are approaching and likely to reach flood stage, but likely not within the next 24 hours.
    High Water Advisory: A high water advisory is issued when a heavy storm or high flows are expected and may cause water levels to rise, but not necessarily reach flood stage. A high water advisory can be an early indicator for conditions that may develop into a flood watch or flood warning.
Hydrologic Forecasting & Water Management
Water Management & Structures Division
Manitoba Infrastructure