April 10, 2017
FLOOD BULLETIN #13
Manitoba Infrastructure’s Hydrologic Forecast Centre reports
overland flooding and tributary flows are beginning to subside across
parts of southern Manitoba. Flows in the Assiniboine River are
continuing to rise.
Ice is still in place on northern rivers and
tributaries. A high water advisory is in place for the Carrot River
near The Pas. All major rivers in southern Manitoba are ice free.
The partial closure at the Gretna dike remains in place.
As of this morning, flow on the Portage Diversion channel is
19,176 cubic feet per second (cfs) or 543 cubic metres per second (cms)
and flows on the Assiniboine River downstream of the diversion are 13,225
cfs (375 cms). That flow will be maintained today as upstream flows
from Holland are delayed. Flows may be increased to 15,000 cfs (425
cms) by tomorrow.
The revised Assiniboine River forecast suggests the
Assiniboine and Souris rivers may peak at the same time at the Portage
Reservoir. At Holland, with a weather forecast indicating no future
precipitation, it is expected that flows will be approximately 43,000 cfs
(1,217 cms) between the dates of April 12 and 13. It is anticipated
the Portage Diversion will be above design flow of 25,000 cfs (708 cms)
for approximately five days. Preparations for temporary flood
protection measures are underway along the lower Assiniboine River and
crews are preparing the diversion to handle emergency flows above 25,000
cfs (708 cms). Municipalities are preparing for flows of 16,000 cfs
(453 cms) on the lower Assiniboine River.
A flood watch remains in effect for the area between Portage
la Prairie and Headingley.
Water levels at James Avenue were measured at 17.4 feet this
morning. With the floodway in operation, water levels at James
Avenue are expected to remain within the range of 17 to 17.5 ft. for the
next week as flows on the Red River recede and flows on the Assiniboine
A flood warning remains in effect for the upper Assiniboine
River from the Shellmouth Dam to Holland but the warning for Oak Lake and
the Souris River has ended as the Souris River has crested. The
Assiniboine River is at or near peak in Brandon today at the 18th Street
A flood warning remains in effect for Pelican Lake, but it
is near crest.
The Carrot River upstream in Saskatchewan has yet to peak at
Turnberry. Water levels on the Carrot River within Manitoba are
influenced by Carrot River flows and water levels on the Saskatchewan
River where the two rivers meet. Conditions will be monitored
because the ice is still intact in Manitoba, making ice jamming on both
rivers a concern. The backwater effect of ice jamming will
influence water levels on the Carrot River. It is difficult to
estimate the timing and effects of ice jams on the two rivers.
The Saskatchewan River at The Pas is currently at
approximately 41,988 cfs (1,189 cms). Due to high flows and the
strength and thickness of ice, there is a risk of ice jamming.
Homeowners affected by this spring’s flooding are reminded
to review their home insurance. Overland flood insurance was
introduced by some insurers in Manitoba in 2016.
High water levels have led to a number of road closures
across the province. Avoid driving through moving water as the
water depth can be unpredictable and the current can push vehicles off
Up-to-date flood information can be found at www.gov.mb.ca/flooding/ or on
Twitter at www.twitter.com/MBGov.
For current highway conditions, call 511, visit www.manitoba511.ca, or follow the
Twitter account at www.twitter.com/MBGovRoads for closures. A Manitoba 511 app is now available for download at http://residents.gov.mb.ca/apps/511.html.
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