Just outside of Crosby is the Portsmouth Mine Pit Lake, sometimes called the Portsmouth Pit, is the deepest lake in Minnesota at over 450 feet (137 m). The 120 acre (50 ha) artificial lake is a former iron mining pit in the Cuyuna Range that has since filled with water. In the last five years, the Minnesota DNR has repeatedly stocked the lake with brook and rainbow trout and fishing is a prime activity on the lake with its crystal clear waters.
On August 19, 1957, the mine pit, then not yet filled with water, served as launch site for a big stratospheric balloon; the second flight of the Air Force's Project Manhigh. http://stratocat.com.ar/fichas-e/1957/CBY-19570819.htm
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