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IntermediateShore Dive
Portsmouth Mine Pit Lake
Minnesota, United States
Depth10–450 ft (3–137.2 m)
AccessShore
Cert LevelOpen Water for shallow shelves; Advanced/technical training for wall dives below 60 ft
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Visibility
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Best Time
May through October
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A flooded iron-ore pit on the edge of Crosby in the Cuyuna Range, and at roughly 400-450 ft the deepest lake entirely within Minnesota. Its rock-filtered water gives up to 50 ft of visibility, and divers work the sheer walls, shelves and old mine features; most recreational dives stay in the 30-100 ft range while technical divers go far deeper. The Minnesota School of Diving in Brainerd leads group dives here several days a week from May through October.
Quick Facts
Depth Range3m – 137.2m
CertificationOpen Water for shallow shelves; Advanced/technical training for wall dives below 60 ft
Gear7mm wetsuit or drysuit, dive light, dive flag, redundant gas for deeper profiles
HazardsExtreme depth beyond recreational limits, steep walls, cold water below thermocline, submerged trees and mine debris
shorewall
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