Minnesota · DNR survey data
Portsmouth Mine Lake
Portsmouth Mine Lake covers 149 acres in Crow Wing County, running to 395 feet, last surveyed by the DNR in 2022. The Minnesota DNR has not published bathymetry for this lake, so there is no depth map here, just the survey record: what the nets held and how big it ran.
DNR survey data
Fish species
Largemouth bassPresent0.2per trap net11"Typical18"Biggest
Lengths measured · 15 fish
Recent · 2022Lengths measured · 15 fish
2022Lengths measured · 16 fish
2010Northern pikeJust a few1.3per gill net16"Typical32"Biggest
Lengths measured · 11 fish
Recent · 2022Lengths measured · 11 fish
2022Lengths measured · 19 fish
2010BluegillJust a few7.1per trap net5"Typical8"Biggest
Lengths measured · 77 fish
Recent · 2022Lengths measured · 77 fish
2022Lengths measured · 410 fish
2010Present and managed by the DNR.
Rock bassExcellent numbers1.6per trap net8"Typical10"Biggest
Lengths measured · 28 fish
Recent · 2022Lengths measured · 28 fish
2022Lengths measured · 76 fish
2010Rates come from standard DNR survey gear (gill nets, trap nets, electrofishing), judged against statewide benchmarks for the same gear — which is why the same number of fish per net can read differently for two species. Where the standard gear can't count a species reliably, the page shows presence and size only. Typical is the middle fish of those measured. Open a row for the full length spread, survey by survey. You can read every number on this page without an app or an account.
DNR stocking records
Stocking history
| Year | Species | Stocked |
|---|---|---|
| 2025 | Rainbow Trout | 7,500 yearlings · 66 adults |
| 2024 | Rainbow Trout | 7,000 yearlings |
| 2023 | Rainbow Trout | 7,000 yearlings · 92 adults |
| 2022 | Rainbow Trout | 7,000 yearlings · 36 adults |
| 2021 | Rainbow Trout | 7,000 yearlings · 59 adults |
| 2020 | Rainbow Trout | 7,000 yearlings · 54 adults |
| 2019 | Rainbow Trout | 7,000 yearlings · 116 adults |
| 2018 | Rainbow Trout | 7,000 yearlings |
| 2017 | Rainbow Trout | 7,000 yearlings |
| 2016 | Rainbow Trout | 7,000 yearlings |
Recent reports
Portsmouth Mine Lake fishing reports
Recent reports on Portsmouth Mine Lake from guides, tournaments and regular anglers. Anything posted in the last two weeks also bumps the matching spots on the live map, so you'll see a "matches a recent report" tag on them.
Public water access
Getting on the water
- Portsmouth Pit (trailer launch)
Within 30 miles
Nearby lakes
- Pennington Mine Lake · 62 ac · 0.9 mi
- Manuel Mine Lake · 41 ac · 1.3 mi
- Mahnomen, Alstead & Arco Mine Lake · 272 ac · 1.4 mi
- Serpent Lake · 1,116 ac · 2 mi
- Huntington Mine Lake · 106 ac · 2.1 mi
- Clinker Lake · 81 ac · 2.1 mi
- Black Hoof Lake · 201 ac · 2.4 mi
- Rabbit (West Portion) Lake · 536 ac · 3.1 mi
Quick answers
Frequently asked questions
Is there a depth map for Portsmouth Mine Lake?
The Minnesota DNR has not published bathymetry for Portsmouth Mine Lake, so this page carries the survey record instead: species, catch rates and stocking history.
What fish are in Portsmouth Mine Lake?
The most recent DNR survey (2022) recorded largemouth bass, northern pike, bluegill, crappie, yellow perch, rainbow trout, rock bass.
Does Portsmouth Mine Lake have a public access?
Yes. Portsmouth Mine Lake has one public access site: Portsmouth Pit (trailer launch).
Is Portsmouth Mine Lake stocked?
Yes. The DNR stocked rainbow trout in 2025; the stocking table on this page lists every year back to 2016.
When was Portsmouth Mine Lake last surveyed?
The Minnesota DNR last surveyed Portsmouth Mine Lake in 2022, the most recent of 3 surveys on record.
Survey numbers are the Minnesota DNR's. How this site reads them →
Page updated .