---
type: lake
name: "Portsmouth Mine"
county: "Crow Wing"
nearest_town: "Armour Number Two Mine"
lake_type: "mine pit lake"
acres: 149
max_depth_ft: 395
latitude: 46.4901
longitude: -93.96588
lake_score: 74
dnr_lake_id: "18043700"
url: https://www.minnelakes.org/lakes/crow-wing-county/portsmouth-mine
---

# Portsmouth Mine

Mine pit lake in Crow Wing County, Minnesota, near Armour Number Two Mine

- **Surface Area**: 149 acres
- **Max Depth**: 395 ft
- **Shoreline**: 3.1 miles
- **Water Clarity**: 30.5 ft
- **Lake Type**: mine pit lake
- **Public Access**: 1 public boat launch (concrete)
- **Lake Score**: 74/100 (composite of public data, not a visitor rating)

## About

Portsmouth Mine is a 149-acre mine pit lake near Armour Number Two Mine in Crow Wing County, Minnesota. It reaches 395 feet at its deepest point, and has roughly 3.1 miles of shoreline. DNR surveys put average water clarity at about 30.5 feet, which is exceptionally clear for Minnesota.

Minnesota DNR fisheries surveys list 10 fish species here, including northern pike, largemouth bass, black crappie, bluegill, pumpkinseed, and yellow perch. The DNR has stocking records for the lake, so check the stocking report for the most recent species and year classes. The most recent fisheries survey on file dates to 2022.

There is one public boat launch (concrete surface) managed by the Minnesota DNR. Portsmouth Campground is mapped close to the shoreline for overnight stays.

## Access

- **Public access**: 1 public boat launch (concrete)
- **Managed by**: Minnesota DNR
- **Launch fee**: Free at DNR public water accesses

## Fishing

- **Species on DNR survey**: 10
- **Stocked**: Yes
- **Last DNR survey**: 2022
- **Special regulations**: No
- **Ice fishing**: Yes

## Activities

Fishing, Ice Fishing, Boating, Paddling, Camping

## Amenities

Boat Ramp, Campground

### Campgrounds

- Portsmouth Campground

## Fish Species

Northern Pike, Largemouth Bass, Black Crappie, Bluegill, Pumpkinseed, Yellow Perch, Rainbow Trout, Rock Bass, Hybrid Sunfish, Yellow Bullhead

## Nearby Lakes

- [Pennington Mine](https://www.minnelakes.org/lakes/crow-wing-county/pennington-mine) - 0.9 miles, 62 acres
- [Mahnomen, Alstead & Arco Lake](https://www.minnelakes.org/lakes/crow-wing-county/mahnomen-alstead-and-arco-lake) - 1.4 miles, 272 acres
- [Mahnomen Lake](https://www.minnelakes.org/lakes/crow-wing-county/mahnomen-lake) - 1.6 miles, 238 acres
- [Serpent Lake](https://www.minnelakes.org/lakes/crow-wing-county/serpent-lake) - 1.9 miles, 1,116 acres
- [Huntington Mine](https://www.minnelakes.org/lakes/crow-wing-county/huntington-mine) - 2.1 miles, 106 acres
- [Clinker Lake](https://www.minnelakes.org/lakes/crow-wing-county/clinker-lake) - 2.1 miles, 81 acres

## Links

- [Directions](https://www.google.com/maps/dir/?api=1&destination=46.4901,-93.96588)
- [Minnesota DNR LakeFinder](https://www.dnr.state.mn.us/lakefind/lake.html?id=18043700)
- [All lakes in Crow Wing County](https://www.minnelakes.org/lakes/crow-wing-county)

---
*Source: [MinneLakes.org](https://www.minnelakes.org/lakes/crow-wing-county/portsmouth-mine)*