Portsmouth Mine Pit Lake
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Portsmouth Mine Pit Lake, sometimes called the Portsmouth Pit, is the deepest lake in Minnesota at over 450 feet, according to the most recent Minnesota DNR data. The 121-acre man-made lake is a former iron mining pit in the Cuyuna Range that has since filled with water.
The Portsmouth Mine Pit is part of the Cuyuna Country State Recreation Area, located in Crow Wing County. The lake is within Crosby-Ironton city limits.
In the last five years the Minnesota DNR has repeatedly stocked the lake with Brook Trout and Rainbow Trout.