Assiniboine River:

The Shellmouth Reservoir water level declined 0.05 feet to 1410.53 feet in the 24 hour period ending this morning. The decline was due to yesterday’s strong north winds changing to light southerly this morning. Wind direction and speed has a significant effect on reservoir levels and spillway flows. The total reservoir outflow had declined to 2000 cfs this morning but was raised back to 2100 cfs as conduit flows were increased from 200 to 300 cfs at 11 a.m.

The reservoir inflow has crested and has declined from 2600 cfs to 2550 cfs during the past 24 hours. Inflows will exceed outflows until about June 8 after which the reservoir level will begin to decline. The reservoir level may experience a crest on Thursday when strong north winds are expected; however the conduit flow will be reduced to offset the additional spillway flow. Rainfall for the next few days could affect the reservoir levels inflows and outflows. If present forecasts of about 10 mm of rain come true, it should still be possible to keep the total outflow from exceeding 2100 cfs.

The level of the Assiniboine River at Shellmouth bridge declined 0.34 feet since yesterday morning in response to the decreased conduit and spillway flows. The level will rise somewhat later today due to the increase in outflow made this morning. However it is unlikely that the level will rise quite as high as it did yesterday morning.

Flooding of some low lying agricultural lands is taking place from Shellmouth Dam to Millwood. An aerial survey of the river valley from the Dam to PTH 16 yesterday afternoon showed that flooding is limited to oxbows and some other low spots. This is not expected to change unless adverse weather conditions develop during the next few weeks.

A flood sheet for the Assiniboine River is attached.

Red River, Eastern Manitoba:

Levels of small streams in the Nopiming Park area, where 90 mm of rain fell Monday evening continue to subside. The Bird River which is a larger watershed most affected by the rain appears to be near its crest but will be running high for another week or so The return period of the rain which fell in the Booster Lake area last Tuesday, considering both the amount and intensity, is estimated to be about 100 years.

There is a danger that additional flooding problems could develop in the Nopiming Park area late this week due to additional heavy rain expected on Thursday. A flood watch may be issued for the area tomorrow depending on an updated precipitation forecast.

Saskeram Area:

Flooding will continue in the Saskeram area for many weeks due to the large amounts of water in storage in the marshes and lakes. Bracken Dam is being operated to reduce levels to the extent possible. MAFRI, is working with the T.M. of Kelsey and Crown Lands to help farmers affected by flooding. Levels of the Carrot River continue to decline and the Saskatchewan River has also declined in recent days.  

Red Deer Lake:

The level of Red Deer Lake appears to be at its second crest about one-third of a foot lower than the crest observed in early May. While the lake is very high, all properties remain protected by dikes and access to the area has not been impeded.

Red River:

Levels of the Red River in Manitoba are presently declining but will begin to rise again next week in response to heavy rains in the Fargo area last week. With additional rain developing on Thursday, the next crest on the Red River may well exceed that which passed late last week. More detailed information will be provided in the days to come.