Long Lake
Cass County, Minnesota, near Longville. DNR lake ID 11014200.
Long Lake is a 1,007-acre lake in Cass County, Minnesota, near Longville. Its deepest point reaches 115 ft, and about 35% of the lake is shallower than 15 feet. Summer water clarity averages 22.6 feet in Minnesota Pollution Control Agency monitoring, which places it in the oligotrophic nutrient class. It is not on the DNR infested waters list as of September 2026. DNR surveys document walleye, northern pike, largemouth bass, black crappie, bluegill, yellow perch.
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Quick facts
| DNR lake ID | 11014200 |
|---|---|
| County | Cass County, near Longville |
| Surface area | 1,007 acres |
| Maximum depth | 115 ft |
| Share under 15 ft | 35% |
| Water clarity (summer) | 22.6 ft through 2025 |
| Phosphorus (summer) | 11.2 µg/L |
| Algae, chlorophyll-a (summer) | 2.9 µg/L |
| Nutrient class | Oligotrophic |
| Invasive species | Not on DNR infested waters list (Sept 2026) |
| Public water accesses | 1 |
Water quality
Summer averages from Minnesota Pollution Control Agency monitoring through 2025: clarity 22.6 ft, phosphorus 11.2 µg/L, algae (chlorophyll-a) 2.9 µg/L. Using the Carlson trophic state index, Long Lake rates as oligotrophic.
Fishing on Long Lake
The most recent DNR standard fish survey was in 2021 (5 years ago). Catch per net is compared with the DNR’s typical range for lakes of the same type.
| Species | Net | Catch per net | Typical range |
|---|---|---|---|
| Walleye | gill | 1.67 | 1.3 to 5.5 |
| Walleye | trap | 0.17 | 0.2 to 0.7 |
| Northern pike | gill | 8.67 | 3.1 to 8.5 |
| Northern pike | trap | 0.33 | n/a |
| Yellow perch | gill | 0.67 | 2.5 to 24.2 |
| Black crappie | gill | 1.17 | 0.5 to 2.7 |
| Black crappie | trap | 1.17 | 0.7 to 3.2 |
| Bluegill | gill | 5.67 | n/a |
| Bluegill | trap | 7.33 | 5.6 to 42.3 |
| Largemouth bass | gill | 2.75 | 0.3 to 1.2 |
| Largemouth bass | trap | 0.08 | 0.3 to 1.1 |
| Tullibee (cisco) | gill | 2.92 | 0.7 to 6.5 |
| Pumpkinseed | gill | 0.75 | n/a |
| Pumpkinseed | trap | 0.08 | 1.7 to 8.2 |
| Rock bass | gill | 2.5 | 0.3 to 2.0 |
| Rock bass | trap | 0.42 | 0.6 to 2.5 |
| Hybrid sunfish | trap | 0.83 | n/a |
Walleye catch was within the typical range for similar lakes in that survey.
Largest fish measured in recent DNR samples: Northern pike 34.0 in (2021), Walleye 25.0 in (2021), Largemouth bass 16.0 in (2021).
Game and panfish documented since 2005: Walleye, Northern pike, Largemouth bass, Black crappie, Bluegill, Yellow perch, Pumpkinseed, Hybrid sunfish, Rock bass, Green sunfish, Tullibee (cisco), White sucker, Yellow bullhead, Brown bullhead.
Fishing regulations
No lake-specific regulation found in Minnesota Rules or the DNR sunfish list. Statewide and zone regulations apply.
Regulations change. Confirm with the DNR before fishing.
Invasive species
Not on the Minnesota DNR infested waters list as of September 2026. That means no confirmed listing, not a guarantee the lake is free of invasive species.
Public boat access
- Long Lake: 1 concrete slab launch ramp, 1 dock, 3 trailer spaces. 1.5 mi N of Longville on Mn Hwy 84, then 1.5 mi NE on Cnty Rd 126, then 1 mi E to NW shore. Directions
DNR water access records (2023). Confirm current conditions with the DNR.
Nearby lakes
- Kego Lake 0.7 mi, Cass County
- Maple Lake 1.2 mi, Cass County
- Boxell Lake 2.4 mi, Cass County
- Girl Lake 3.4 mi, Cass County
- Inguadona Lake 3.6 mi, Cass County
- Town Line Lake 3.6 mi, Cass County
- Cooper Lake 3.8 mi, Cass County
- Rice Lake 3.9 mi, Cass County
Questions about Long Lake
How deep is Long Lake?
Long Lake reaches a maximum depth of 115 ft according to Minnesota DNR records. About 35% of the lake is shallower than 15 feet.
How big is Long Lake?
Long Lake covers about 1,007 acres in Cass County, Minnesota.
How clear is Long Lake?
Summer water clarity on Long Lake averages 22.6 feet (Secchi depth) in MPCA monitoring through 2025. Its trophic state is oligotrophic.
Does Long Lake have zebra mussels or other invasive species?
Long Lake is not on the Minnesota DNR infested waters list as of September 2026. That means there is no confirmed listing; it is not a guarantee the lake is free of invasive species.
What fish are in Long Lake?
Minnesota DNR surveys document walleye, northern pike, largemouth bass, black crappie, bluegill, yellow perch, pumpkinseed, hybrid sunfish, rock bass, green sunfish in Long Lake. The most recent standard survey was in 2021.
Where is the public boat access on Long Lake?
Long Lake has 1 public water access site on DNR record: Long Lake.
How is the walleye population on Long Lake?
In Minnesota DNR net surveys from 1993 to 2021, walleye numbers on Long Lake ran mostly below the typical range for similar lakes. Nets measure how many fish a lake holds, not where they’re biting, so local guides are the best source for current fishing.
Are there lake homes for sale on Long Lake?
Homes on Long Lake come up for sale throughout the year, and some sell before they’re ever publicly advertised. Tell us what you’re looking for and our agents will run a custom search and send you matching homes on Long Lake and nearby lakes, including off-market opportunities when available.
What is it like to live on Long Lake?
A mid-size lake with room for boating and fishing, about 35% shallow shoreline under 15 feet, and summer clarity around 22.6 feet. Conditions vary by property, so walk the frontage and ask us what similar homes have sold for.
Are there special fishing regulations on Long Lake?
No lake-specific regulation was found for Long Lake in Minnesota Rules or the DNR sunfish list. Statewide and zone regulations apply.
Ask us about Long Lake
Whether you’re buying, selling, or just curious, our team works Cass County lakes every day. Send us a note or call (218) 656-6469.
Sources: Minnesota DNR LakeFinder records, DNR fish surveys (latest 2021), DNR infested waters list (Sept 2026), Minnesota Rules 6264.0400 (April 2026), MPCA monitoring via the Water Quality Portal, DNR water access records (2023), LAGOS-US. Lakewide information from public data; it does not describe any specific property. Verify shoreline, bottom type, and depth at any frontage.