Portsmouth Mine Pit Lake
Quarry · Minnesota
ℹ️ Community-reported spot. Details below are compiled from public sources and are reported to be accurate — always verify locally before visiting.
About this swimming hole
Portsmouth Mine Pit Lake is a flooded iron mine turned into one of Minnesota's clearest and deepest swimming lakes, inside Cuyuna Country State Recreation Area. The swim beach fronts startlingly blue water ringed by mine-pit cliffs and forest. It doubles as a top scuba diving lake, a testament to the visibility.
Good to know
| Water type | Quarry |
|---|---|
| Water temperature | 60s |
| Depth | one of Minnesota's deepest lakes |
| Best season | June-August |
| Fees | MN state recreation area vehicle permit required |
| Reservations required | No |
| Parking | state recreation area lots |
| Amenities | swim beach, restrooms, hiking and mountain bike trails |
| County | Crow Wing County |
| Nearest town | Crosby |
| Safety notes | no lifeguard; very deep water |
Map
Nearby swimming holes
Frequently asked questions
Does Portsmouth Mine Pit Lake require reservations?
No reservations are required at Portsmouth Mine Pit Lake based on current information — but verify before you go.
Is there a fee to visit Portsmouth Mine Pit Lake?
Reported fee info: MN state recreation area vehicle permit required. Fees can change — confirm with the official link.
When is the best time to visit Portsmouth Mine Pit Lake?
The best season is typically June-August.
⚠️ Verify before you go. Conditions, fees, reservations, and access can change — confirm details with the official link before visiting. Last verified: September 2026