Kashwakamak Lake Dam

Understanding Kashwakamak Lake DamKashwakamak Lake Dam

Located on the main channel of the Mississippi River, Kashwakamak Lake (a.k.a. Long Lake) is dominated by numerous inlets and shallow bays and is located in the Township of North Frontenac. The Mississippi River enters the west end of the lake from the outlet of Georgia Lake at Whitefish Rapids and exits at the Kashwakamak Lake Dam at the east end of the lake to flow down the Mississippi River through Farm and Mud Lake to Crotch Lake.  

The Kashwakamak Lake Dam is used as a water control structure and is located at the outlet at the east end of Kashwakamak Lake. The Kashwakamak Lake Dam is a concrete structure consisting of two sluices each containing ten 0.30 m x 0.30 m x 3.43 m stoplogs and an overflow weir with an elevation of 261.06 m, which regulates levels throughout most of the summer.  MVCA owns and operates this structure. The Kashwakamak Lake Dam has a drainage area of 417 sq km and the total storage volume is 3,822 ha m.

Seasonal Management Strategies


As the spring freshet occurs, the dam is operated to slowly bring lake levels up to summer requirements while trying to minimize shoreline damage from ice movement. 
The summer water levels are targeted prior to the start of the walleye spawn, if possible, due to the existence of a prime spawning shoal at the head of the lake at Whitefish Rapids.


Lake levels are targeted between 261.00 m and 261.20 m throughout the summer months, with a minimal flow being passed through the dam to keep water in the downstream channel.  

The fall drawdown begins after Thanksgiving weekend with 14 of the 20 stoplogs removed during the drawdown. 
Minimum winter lake level of 259.60 m a.s.l. is targeted for the end of February.  

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