We provide water level and flow outlooks so communities have information on water conditions on the Churchill, Nelson and Burntwood rivers during the spring melt.*
Churchill River (Southern Indian Lake to Hudson Bay)
Spring melt has largely passed and flows are average. Spring melt started in early May with flows lower than last year but above average. Warm temperatures earlier this month resulted in a rapid but brief snowmelt runoff in the region. Churchill River flows at Churchill are estimated at approximately 29,000 cfs and are declining. River ice continues to melt, and water levels near the weir and CR30 pumphouse are declining in response to both declining flows and the deteriorating ice cover.
Outflows through Missi Control Structure are 1,700 cfs, are following licence minimum winter releases and may increase by the end of the month. The timing and magnitude of these forecasted changes will be influenced by weather conditions and operations and are subject to change.
Much of the Churchill River flow is diverted out of Southern Indian Lake through the Churchill River Diversion via the Notigi Control Structure to the Rat and Burntwood rivers. Flows through Notigi are at 28,500 cfs, which is higher than last year’s flow of 26,200 cfs.
Nelson River flows have peaked and will continue to decline over the next few weeks. Lake Winnipeg water level is 713.8 ft ASL and is expected to increase through May, remaining below average. Kelsey outflow is 76,300 cfs which is lower than last year’s 87,800 cfs. Split Lake water level is currently 549.2 ft ASL and is expected to gradually decline through May.
*Spring flows depend on how long it takes for snow to melt (i.e. warm temperatures will cause a fast melt and higher water flows; while cooler temperatures will cause a slow melt and moderate flows for a longer period of time). Conditions can also change rapidly if a large rainfall or snowfall event occurs. Outlook information will be updated as conditions change.
The Outlook is based on a combination of current and forecasted weather data from Environment and Climate Change Canada; recent and historic streamflow conditions based on both federal and Manitoba Hydro data; Manitoba Hydro regulation models for Reindeer Lake and Southern Indian Lake; snow surveys conducted by Manitoba Hydro; and snowpack estimates from satellite data.
If you have any questions or concerns, please contact:
Waterway Community Engagement