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Tioga Pit

Tioga Pit

Minnesota, United States

Depth
Depth Icon

69m

Visibility
Visibility Icon

3m - 8m

Entry
Boat Entry Icon

Boat

Experience Level

Beginner

Tioga Pit

Minnesota, United States

Tioga Pit
Depth
Depth Icon

69m

Visibility
Visibility Icon

3m - 8m

Entry
Boat Entry Icon

Boat

Experience Level

Beginner


About Tioga Pit

The abandoned iron ore pit, deserted since the late 1950s, offers a captivating aquatic experience for divers and swimmers alike. Once a hub of mining activity, the site now serves as an intriguing dive location, with remnants of its industrial past submerged beneath the water. The east side of the pit, accessible from shore, is ideal for novice divers, while the west side, reachable only by boat, offers more challenging opportunities. The site features a striking rock wall that descends sharply from about 18 meters (59 feet) to 52 meters (171 feet) in some areas, with a submerged mining structure starting at 30 meters (98 feet) and plunging to 44 meters (144 feet). This structure, while fascinating, requires boat access and presents varying visibility depending on weather conditions, particularly after rain.

The pit's water clarity varies, typically offering visibility up to 8 meters (25 feet). The maximum depth of the pit is 69 meters (226 feet), though the silt at the bottom, which is up to 3 meters (10 feet) thick, slightly reduces this depth. Despite this, the pit's underwater features, including its rocky walls, shelves, and submerged trees, remain accessible and provide an exciting exploration opportunity. The site caters to divers of all skill levels, from beginners to advanced technical divers, with local dive shops supporting fun dives and events throughout the summer. The surrounding area, particularly the Cuyuna Country State Recreation Area, offers additional diving spots, with accommodations and amenities readily available for visiting divers.

Tioga Pit Dive Info

Terrain & Features

Drop Off, Inland, Night, Deep, Wall, Other

Entry Type

Boat

Max Depth

69m

Visibility Range

3m 8m

Experience Level

Beginner

Best Gas Mix

-1% at 67m / 21%

O2
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Marine Life

  • Smallmouth Bass
  • Trout
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Location

Dive Site Hazards

  • Edge-Accelerated Currents — Currents often strengthen along drop-off edges.

  • Depth Perception Distortion — Visual contrast can distort perceived depth.

  • Terrain-Induced Descent — Divers may unintentionally follow terrain downward.

  • Thermocline Buoyancy Shift — Sharp thermoclines can cause sudden buoyancy changes.

  • Instant Visibility Collapse — Sediment disturbance can eliminate visibility immediately.

  • Late Detection of Structures — Submerged structures may only appear at very close range.

  • Landmark Misidentification — Familiar sites can become unrecognisable at night.

  • Light-Induced Tunnel Vision — Focused light beams reduce peripheral awareness.

  • Depth Perception Errors — Reduced ambient light increases depth perception mistakes.

  • Gradual Narcosis Onset — Narcosis may develop slowly, making self-assessment unreliable.

  • Task Fixation at Depth — Cognitive narrowing at depth can reduce awareness of time and ascent rate.

  • Increased Gas Density Breathing Load — Higher gas density at depth increases work of breathing.

  • Unstable Visual Ascents — Relying on wall visuals can destabilise ascents.

  • Gradual Depth Creep — Lack of visual bottom reference can cause unnoticed descent.

  • Unsignalled Downcurrents — Downcurrents can form without visible indicators.

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