Island Lake
About Island Lake
Island Lake is a 616-acre lake near Lengby in Mahnomen County, Minnesota. It reaches 43 feet at its deepest point, and has roughly 9.4 miles of shoreline. DNR surveys put average water clarity at about 6.7 feet.
Minnesota DNR fisheries surveys list 11 fish species here, including walleye, northern pike, largemouth bass, black crappie, bluegill, and pumpkinseed. 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 2025.
There is one public boat launch (concrete surface).
Plan Your Visit to Island Lake
- 616 acres, up to 43 feet deep, near Lengby
- 1 public boat launch (concrete)
- Game fish on the DNR survey: walleye, northern pike, largemouth bass, black crappie, bluegill, and pumpkinseed
- Average water clarity around 6.7 feet
Access & Fees
- Public access
- 1 public boat launch (concrete)
- Launch fee
- Free at DNR accesses
Conditions
- Surface area
- 616 acres
- Max depth
- 43 ft
- Shoreline
- 9.4 mi
- Water clarity
- 6.7 ft
- Shallows (under 15 ft)
- 331 acres
Rules & Regulations
- A Minnesota fishing license is required for anglers 16 and older
- Drain plugs must be out and all water drained before leaving any access; remove aquatic plants from boats and trailers
- Children under 10 must wear a life jacket on a boat that is underway
Facilities
- 1 public boat launch (concrete)
Best For
- Walleye fishing
- Ice fishing
- Ice is never completely safe — check thickness yourself before walking or driving on any lake
Angler's Report
Minnesota DNR LakeFinder- Species on survey
- 11
- Game fish
- 8
- Stocked
- Yes
- Last DNR survey
- 2025
- Special regulations
- No
- Fishing pier
- No
- Ice fishing
- Yes
- Boat launch
- Yes
Fishing data: Minnesota Department of Natural Resources. Regulations change — confirm with the current DNR fishing regulations.
Activities
Amenities
Fish Species
Plan your trip to Island Lake
Compare Island Lake against the top-ranked lakes nearby, then map your route.
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Nearby Lakes
Spring Lake
61 out of 100 Lake ScorePolk · Lengby134 acres
4.1 miles away
Sand Hill Lake
45 out of 100 Lake ScorePolk · Fosston479 acres
5.8 miles away
Little Vanose Lake
49 out of 100 Lake ScoreMahnomen · Bejou143 acres
7 miles away
Lone Lake
25 out of 100 Lake ScoreMahnomen · Jack Pine112 acres
7.8 miles away
Whitefish Lake
51 out of 100 Lake ScorePolk · Fosston243 acres
9.4 miles away
Minnow Lake
52 out of 100 Lake ScoreClearwater · Bagley110 acres
10.1 miles away
Frequently Asked Questions
Where is Island Lake?
Island Lake is in Mahnomen County, Minnesota, near Lengby. It covers 616 acres and reaches 43 feet deep.
How big and how deep is Island Lake?
Island Lake covers 616 acres with about 9.4 miles of shoreline. Its maximum depth is 43 feet.
What fish can you catch at Island Lake?
Minnesota DNR surveys list Walleye, Northern Pike, Largemouth Bass, Black Crappie, Bluegill, Pumpkinseed, Yellow Perch, and Rock Bass and other species. A Minnesota fishing license is required for anyone 16 and older.
Is there a public boat launch on Island Lake?
Yes. Island Lake has 1 public boat launch (concrete). DNR public water accesses are free to use.
Can you swim at Island Lake?
There is no mapped public swim beach at Island Lake. Minnesota's public waters are open to swimming where you have legal access, but there are no lifeguards or water-quality monitoring away from designated beaches.
Is Island Lake stocked?
Yes. The Minnesota DNR has stocking records for Island Lake; species and numbers vary by year, so see the stocking report on DNR LakeFinder.