Long Lake
About Long Lake
Long Lake is a 387-acre lake near Isanti in Isanti County, Minnesota. It reaches 15 feet at its deepest point, with an average depth of about 5 feet, and has roughly 5.5 miles of shoreline. By surface area it ranks No. 3 among the 14 Isanti County lakes in this directory. DNR surveys put average water clarity at about 1.5 feet, so expect stained or algae-tinted water in summer.
Minnesota DNR fisheries surveys list 15 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 2022.
There are 2 public boat launches (concrete surface) managed by the township and Minnesota DNR. The lake is listed as infested with Eurasian watermilfoil — clean, drain and dry your boat and gear before leaving. Ice typically goes out around April 6, based on 13 years of DNR ice-out records.
Plan Your Visit to Long Lake
- 387 acres, up to 15 feet deep, near Isanti
- 2 public boat launches (concrete) — managed by the township and Minnesota DNR
- Game fish on the DNR survey: walleye, northern pike, largemouth bass, black crappie, bluegill, and pumpkinseed
- Average water clarity around 1.5 feet — expect green or stained water by midsummer
- Listed as infested with Eurasian watermilfoil — clean, drain and dry before you leave
Access & Fees
- Public access
- 2 public boat launches (concrete)
- Launch fee
- Free at DNR accesses
- Managed by
- township, Minnesota DNR
Conditions
- Surface area
- 387 acres
- Max depth
- 15 ft
- Average depth
- 5 ft
- Shoreline
- 5.5 mi
- Water clarity
- 1.5 ft
- Shallows (under 15 ft)
- 382 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
- 2 public boat launches (concrete)
Best For
- Walleye fishing
- Ice fishing
- Low-clarity lakes are prone to summer algae blooms; keep dogs out of green, scummy water
- Ice is never completely safe — check thickness yourself before walking or driving on any lake
Angler's Report
Minnesota DNR LakeFinder- Species on survey
- 15
- Game fish
- 8
- Stocked
- Yes
- Last DNR survey
- 2022
- 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.
Ice-Out History
- Median ice-out
- April 6
- Years of record
- 13
- Earliest
- March 13, 2016
- Latest
- May 1, 2013
- Most recent
- April 30, 2018
See every lake on the ice-out tracker. Ice-out data: Minnesota DNR State Climatology Office.
Activities
Amenities
Fish Species
Plan your trip to Long Lake
Compare Long Lake against the top-ranked lakes nearby, then map your route.
See how Long Lake ranks among fishing lakes nearby.
See how Long Lake ranks among boating lakes nearby.
See how Long Lake ranks among paddling lakes nearby.
See how Long Lake ranks among ice fishing lakes nearby.
Nearby Lakes
Lake Francis
50 out of 100 Lake ScoreIsanti · Isanti269 acres
2.3 miles away
Spectacle Lake
60 out of 100 Lake ScoreIsanti · Cambridge246 acres
7.3 miles away
Florence Lake
48 out of 100 Lake ScoreIsanti · Edgewood135 acres
7.5 miles away
Blue Lake
53 out of 100 Lake ScoreIsanti · Princeton296 acres
7.5 miles away
Green Lake
54 out of 100 Lake ScoreIsanti · Princeton833 acres
8.2 miles away
George Lake
65 out of 100 Lake ScoreAnoka · Saint Francis (Anoka)489 acres
8.2 miles away
Frequently Asked Questions
Where is Long Lake?
Long Lake is in Isanti County, Minnesota, near Isanti. It covers 387 acres and reaches 15 feet deep.
How big and how deep is Long Lake?
Long Lake covers 387 acres with about 5.5 miles of shoreline. Its maximum depth is 15 feet and its average depth is about 5 feet.
What fish can you catch at Long Lake?
Minnesota DNR surveys list Walleye, Northern Pike, Largemouth Bass, Black Crappie, Bluegill, Pumpkinseed, Yellow Perch, and Burbot and other species. A Minnesota fishing license is required for anyone 16 and older.
Is there a public boat launch on Long Lake?
Yes. Long Lake has 2 public boat launches (concrete), managed by the township and Minnesota DNR. DNR public water accesses are free to use.
Can you swim at Long Lake?
There is no mapped public swim beach at Long 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 Long Lake stocked?
Yes. The Minnesota DNR has stocking records for Long Lake; species and numbers vary by year, so see the stocking report on DNR LakeFinder.
When does the ice go out on Long Lake?
The median ice-out date is April 6, from 13 years of Minnesota DNR records. The earliest on record is March 13, 2016 and the latest is May 1, 2013.
Does Long Lake have invasive species?
Yes. The DNR lists Long Lake as infested with Eurasian watermilfoil. State law requires you to clean off plants, pull the drain plug and drain all water before leaving the access.