Manitoba Water Stewardship

Precipitation in southern Manitoba and eastern Saskatchewan during the past 3 days has ranged from 5-10 mm in most areas with 15 mm in a few locations. Environment Canada predicts little or no rain for the next five days.

A FLOOD WATCH CONTINUES FOR THE ASSINIBOINE RIVER FROM SHELLMOUTH TO MILLWOOD.

Outflows from Shellmouth Reservoir continue to be near 1700 cfs. While flooding from Shellmouth Dam to Millwood so far this spring has been limited to the most low lying lands, there continues to be a risk of more significant flooding due to possible adverse weather during the next few weeks. With the spillway being overtopped, rain and/or strong north winds could produce uncontrolled spillway flows in excess of the downstream channel capacity.

The reservoir level this morning was at 1410.37 feet, which is 1.87 feet higher than the spillway. The flow over the spillway this morning was1600 cfs while that through the controlled conduit was 100 cfs. The conduit flow was reduced from 200 cfs to 100 cfs at 10:40 this morning, mainly due to brisk northerly winds which had raised flows over the spillway.

The reservoir inflow is 2100 cfs today and continues to decline slowly. It should be possible to control the peak outflow to about 1700 cfs unless north winds develop later this week or if heavy rain develops in the next few weeks. The reservoir is expected to crest later this week, but the crest date will depend in wind direction and speed during the next 5 days.

Levels of the Assiniboine River from St. Lazare to Brandon are expected to change little during the next 10 days unless significant rain develops. Levels are near bankfull from Shellmouth Dam to Millwood but continue to be well below bankfull at points further downstream.

Red Deer Lake:

The level of Red Deer Lake has declined 0.2 feet since last Friday and should soon decline a little faster based on favourable weather.

Lake Winnipegosis:

The level of Lake Winnipegosis is high and still rising. The lake is expected to crest in late May at an elevation slightly lower than that of last year. Some flooding of low lying lands near the lake is likely during days with strong onshore winds

Carrot River—Saskatchewan Boundary to 14 miles west of The Pas :

Levels of the Carrot River continue to decline very slowly but more significant declines in eastern Saskatchewan should arrive in Manitoba later this week. Flooding some fields near the river from the Saskatchewan boundary about 14 miles west of The Pas will continue until the end of this week.

Saskatchewan and Carrot Rivers at The Pas

River levels at the Pas have declined slightly during the past few days. Levels will continue to be high for a few more weeks. Outflows from Tobin Lake in Saskatchewan were increased over the weekend as the crest from Alberta has now reached the Lake. The continued high river levels at The Pas will prevent natural drainage from the Pasquia area just southwest of The Pas and will require pumping by Manitoba Water Stewardship and MIT staff to continue.

A flood sheet for the Swan River area is not available for today.