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2020 Mississippi Valley Fall Draw Down Timetable

Home > News > 2020 Mississippi Valley Fall Draw Down Timetable

Posted on 30 October 2020 in News

The Mississippi Valley Conservation Authority’s annual fall draw down is underway.    

Draw downs on Shabomeka and Pine lakes as well as the Carleton Place dam began in September. The Mazinaw Lake dam is being operated to pass additional flows from the draw down of Shabomeka Lake without increasing lake levels.

The draw down of Kashwakamak, Mississagagon, Big Gull, Summit and Widow lakes started after Thanksgiving weekend. The drawdown on Mazinaw Lake will not start until early November to account for boat traffic through the narrows during hunting season. Winter target levels are normally reached before freeze up but are dependent on how much rainfall the watershed receives over the fall season. Seasonal conditions are expected over the next two months.

The following chart provides fall drawdown dates on lakes that are used to provide storage for flooding for next spring.

Lake/DamDrawdown Start DateDrawdown End Date
Shabomeka Lake DamMid-SeptemberEarly October
Pine Lake DamMid-SeptemberLate September
Mississippi Lake/Carleton Place DamMid-SeptemberEarly October
Kashwakamak Lake DamAfter Thanksgiving (mid-October)Early December
Mississagagon Lake DamAfter Thanksgiving (mid-October)Mid-October
Big Gull Lake DamAfter Thanksgiving (mid-October)Mid-November
Summit Lake DamAfter Thanksgiving (mid-October)Mid-October
Widow Lake DamAfter Thanksgiving (mid-October)Mid-October
Mazinaw Lake DamAfter hunting season (mid-November)Mid-December

Residents are urged to use extreme caution around these structures as strong currents will be present while water levels decrease to normal fall levels during this time and should ensure that all boats, floating docks, etc., have been removed. 

Daily water levels and flows are available on the MVCA website at


Jennifer North, Water Resources Technologist
613-253-0006 ext. 243