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Flood Report - April 12, 2019

Posted: April 12, 2019

Flood Report for Manitoba
April 12, 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. Morning Conditions reports, with current water level data, are available on the department’s website this morning and flood sheets with updated forecast 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 brought blizzard conditions and a significant amount of snowfall to the southern Red River basin. The snow is expected to stop today and the amount and distribution of snowfall will be assessed.
  • 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. PR 204 west of PR 212 remains closed, including the bridge connecting Selkirk and East Selkirk, because of high water levels. 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 brought blizzard conditions and a significant amount of snowfall to the southern Red River basin. The snow is expected to stop today and the amount and distribution of snowfall will be assessed.
  • A smaller weather system is expected early next week and is forecasted to bring 5-10 mm of precipitation across much of the region.
Red River Basin
  • Yesterday’s forecast for the Red River incorporated the projected precipitation totals from the storm in the USA portion of the Red River basin. An updated forecast will be released later today using measured precipitation data from across the basin.
  • Water levels on the main stem of the Red River in Manitoba continue to rise, although readings at individual stations may be affected by breakup and movement of ice on the river. The ice is reported to have moved out from the River at Morris and Ste Agathe. The recorded water level rise in the last 24 hours was 1.4 feet at Emerson, 0.1 feet at Morris (ice affected), and 1.1 feet at Ste. Agathe.
  • Provincial crews are deployed in a number of communities in the Red River Valley implementing ring dike closures and pumping operations to facilitate internal drainage. Partial ring dike closures are currently in place 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 as river levels rise. 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. Over 300 super sandbags have been installed to provide necessary freeboard on the dike at Ste Agathe.
  • Ice has cleared out at the inlet of the Red River Floodway, operation of the gates at the inlet control structure is expected to begin this weekend under rule 1, under which the upstream water level will be kept at or below natural. Rising water levels at the Floodway Inlet have resulted in water spilling naturally into the Floodway Channel prior to operation of the gates.
  • The water level at James Ave in Winnipeg rose 2.7 feet to 16.6 feet, as noted above this reading may be affected by breakup and movement of ice on the river. Ice is moving through the city with ice jams occurring at some locations but no problems have been reported. With operation of the Red River Floodway and other provincial water control structures, James Ave is projected to peak at approximately 18.5-19 feet in late April.
  • PR 204 west of PR 212 remains closed, including the bridge connecting Selkirk and East Selkirk, because of high water levels.
Roseau River
  • Water levels on the Manitoba portion of the Roseau River continue to rise. The current forecast is for a peak flow of 3,800 cfs (110 cms) expected April 20-22, the forecast will be reassessed once the storm event is over and the precipitation has been measured.
  • Crews were on site yesterday to inspect the condition of the Gardenton Floodway.
Assiniboine River Basin
  • The Shellmouth Dam reservoir water level is at 1394.5 feet and the reservoir is rising towards the target water level range of 1402 to 1404 feet. Inflows to the reservoir are approximately 2,090 cfs (59 cms) and outflows are 25 cfs (0.7 cms).
  • The current flow down the Portage Diversion is 250 cfs (7 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. A number of ice jams have been reported on the lower Assiniboine River upstream of Baie St. Paul and are being monitored but no impacts are expected.
  • 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 3,040 cfs (86 cms) through the Fairford River Water Control Structure.
Manitoba Lakes
  • Generally, greater than 90% ice coverage is reported on most Manitoba lakes, It was reported in yesterday’s report that some of the smaller lakes have lost more ice cover – this was incorrect.
  • The water levels on Manitoba’s major lakes are relatively stable and within normal or desirable ranges. Water levels are provided
  • Today’s water levels are as follows:
    • Lake Winnipegosis       831.9 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