E-Service Requests

Add a Notice  |  View Notices

Flood Report - April 10, 2019

Posted: April 10, 2019

Flood Report for Manitoba
April 10, 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.
  • A significant winter storm forecasted for South Dakota and Minnesota has shifted north and is expected to impact the southern portion of the Red River Basin. Heavy wet snow from this system is expected to begin Wednesday night and will last into Friday. The impact of this storm on the Red River peak water levels will be included in forecast values in today’s Flood Sheets.
  • Provincial crews are deployed in a number of communities in the Red River Valley preparing for potential ring dike closures. 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. The partial ring dike closure at Morris is anticipated to occur between April 14 – 16 and will result in the closure of PTH 75 North. 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
  • Above-zero daytime temperatures and sub-freezing overnight lows continue to sustain a slow rate of melt. Daily average temperatures will remain below freezing until Friday, with temperatures warming over the weekend.
  • A significant winter storm forecasted for South Dakota and Minnesota has shifted north and is expected to impact the southern portion of the Red River Basin. Heavy wet snow from this system is expected to begin Wednesday night and will last into Friday. Forecasters are assessing how this precipitation will affect forecasted water levels; much will depend on how much precipitation occurs and where it falls.
Red River Basin
  • Snowfall from the winter storm in the USA portion of the Red River basin is expected to increase the peak by a moderate amount on the Manitoba portion of the Red River and will shift the timing of the peak to a later date. The forecast is currently being assessed and an update will be provided in today’s Flood Sheets.
  • Water levels on the main stem of the Red River in Manitoba continue to rise. The Red River at Emerson rose 2.5 feet in the last 24 hours and is expected to rise above bankfull capacity today.
  • The Red River Floodway is forecasted to begin operations over 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.
Roseau River
  • Water levels on the Roseau River continue to rise. The forecast is currently being assessed and an update will be provided in today’s Flood Sheets.
Assiniboine River Basin
  • The Shellmouth Dam reservoir water level is at 1393.8 feet and the reservoir is rising towards the target water level range. Inflows to the reservoir are approximately 2,000 cfs (57 cms) and outflows are 25 cfs (0.7 cms). The Shellmouth Reservoir Regulation Liaison Committee will meet tomorrow to re-assess runoff volumes and discuss operation scenarios.
  • 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 3,075 cfs (90 cms) through the Fairford River Water Control Structure. The flow on the Waterhen River is 1,100 cfs (30 cms).
Manitoba Lakes
  • Generally, full ice cover is reported on all major Manitoba lakes. 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: 712.8 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