Portsmouth Mine Pit Lake
|Portsmouth Mine Pit Lake|
A view of the swimming area from the campground on the west shore of the lake.
|Basin countries||United States|
|Surface area||121 acres (49 ha)|
|Max. depth||450 ft (140 m)|
Portsmouth Mine Pit Lake, sometimes called the Portsmouth Pit, is the deepest lake completely within the state of Minnesota. It has a depth of over 450 feet (137 m), according to the most recent Minnesota DNR data. Lake Superior, over 700 feet deep off the north shore of the state, is technically deeper. The 120-acre (49 ha) artificial lake is a former iron mining pit in the Cuyuna Range that has since filled with water.
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.
- Details of the Manhigh II flight
- MN DNR Lake information - Portsmouth Pit
- MN DNR MN Facts - Lakes, rivers & wetlands 2003
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