Little Boy Lake
Cass County, Minnesota, near Longville. DNR lake ID 11016700.
Little Boy Lake is a 1,452-acre lake in Cass County, Minnesota, near Longville. Its deepest point reaches 74 ft, and about 32% of the lake is shallower than 15 feet. Summer water clarity averages 10.9 feet in Minnesota Pollution Control Agency monitoring, which places it in the mesotrophic nutrient class. The DNR lists it for zebra mussel. DNR surveys document walleye, northern pike, muskellunge, largemouth bass, smallmouth bass, black crappie.
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Quick facts
| DNR lake ID | 11016700 |
|---|---|
| County | Cass County, near Longville |
| Surface area | 1,452 acres |
| Maximum depth | 74 ft |
| Share under 15 ft | 32% |
| Water clarity (summer) | 10.9 ft through 2025 |
| Phosphorus (summer) | 15.8 µg/L |
| Algae, chlorophyll-a (summer) | 6.0 µg/L |
| Nutrient class | Mesotrophic |
| Clarity trend | Clearer (2016 to 2025) |
| Invasive species | zebra mussel |
| Public water accesses | 1 |
Water quality
Summer averages from Minnesota Pollution Control Agency monitoring through 2025: clarity 10.9 ft, phosphorus 15.8 µg/L, algae (chlorophyll-a) 6.0 µg/L. Using the Carlson trophic state index, Little Boy Lake rates as mesotrophic. Summer clarity trend 2016 to 2025: clearer.
Fishing on Little Boy 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 | 10.42 | 4.0 to 9.6 |
| Walleye | trap | 0.17 | 0.3 to 0.9 |
| Northern pike | gill | 9.42 | 3.0 to 7.9 |
| Northern pike | trap | 0.25 | n/a |
| Yellow perch | gill | 15.5 | 7.1 to 33.9 |
| Yellow perch | trap | 0.33 | 0.7 to 3.7 |
| Black crappie | gill | 0.08 | 0.2 to 1.1 |
| Bluegill | gill | 0.67 | n/a |
| Bluegill | trap | 7.58 | 3.7 to 42.9 |
| Largemouth bass | gill | 0.08 | 0.3 to 1.2 |
| Largemouth bass | trap | 0.42 | 0.4 to 1.4 |
| Smallmouth bass | gill | 3.17 | 0.2 to 0.9 |
| Muskellunge | gill | 0.17 | 0.1 to 0.3 |
| Muskellunge | trap | 0.08 | 0.1 to 0.3 |
| Tullibee (cisco) | gill | 0.42 | 0.5 to 5.2 |
| Pumpkinseed | gill | 0.08 | n/a |
| Pumpkinseed | trap | 0.33 | 1.6 to 6.9 |
| Rock bass | gill | 6.92 | 1.0 to 6.6 |
| Rock bass | trap | 1.08 | 0.7 to 3.3 |
| Hybrid sunfish | trap | 0.42 | n/a |
Walleye catch was above the typical range for similar lakes in that survey.
Largest fish measured in recent DNR samples: Muskellunge 22.0 in (2021), Walleye 24.0 in (2021), Northern pike 30.0 in (2021), Smallmouth bass 20.0 in (2021), Largemouth bass 15.0 in (2021).
Game and panfish documented since 2005: Walleye, Northern pike, Muskellunge, Largemouth bass, Smallmouth bass, Black crappie, Bluegill, Yellow perch, Pumpkinseed, Hybrid sunfish, Rock bass, Tullibee (cisco), Bowfin, Shorthead redhorse, White sucker, Yellow bullhead, Brown bullhead.
Fishing regulations
- Northern pike 24 to 36 in must be released (one over 36 allowed). (Minnesota Rules 6264.0400, April 2026)
Regulations change. Confirm with the DNR before fishing.
Invasive species
On the Minnesota DNR infested waters list for: zebra mussel (listed 2026).
Public boat access
- Little Boy Lake: 1 concrete slab launch ramp, 1 dock, 10 trailer spaces. 4 mi S of Longville on Cass Co. Rd. #54. Directions
DNR water access records (2023). Confirm current conditions with the DNR.
Nearby lakes
- Shurd Lake 1.5 mi, Cass County
- Cooper Lake 1.7 mi, Cass County
- Rice Lake 1.9 mi, Cass County
- Hunter Lake 2.1 mi, Cass County
- Wabedo Lake 2.7 mi, Cass County
- Camp Two Lake 3.0 mi, Cass County
- Girl Lake 3.5 mi, Cass County
- Inguadona Lake 3.6 mi, Cass County
Questions about Little Boy Lake
How deep is Little Boy Lake?
Little Boy Lake reaches a maximum depth of 74 ft according to Minnesota DNR records. About 32% of the lake is shallower than 15 feet.
How big is Little Boy Lake?
Little Boy Lake covers about 1,452 acres in Cass County, Minnesota.
How clear is Little Boy Lake?
Summer water clarity on Little Boy Lake averages 10.9 feet (Secchi depth) in MPCA monitoring through 2025. Its trophic state is mesotrophic.
Does Little Boy Lake have zebra mussels or other invasive species?
The Minnesota DNR infested waters list includes Little Boy Lake for zebra mussel.
What fish are in Little Boy Lake?
Minnesota DNR surveys document walleye, northern pike, muskellunge, largemouth bass, smallmouth bass, black crappie, bluegill, yellow perch, pumpkinseed, hybrid sunfish in Little Boy Lake. The most recent standard survey was in 2021.
Where is the public boat access on Little Boy Lake?
Little Boy Lake has 1 public water access site on DNR record: Little Boy Lake.
How is the walleye population on Little Boy Lake?
In Minnesota DNR net surveys from 1996 to 2021, walleye numbers on Little Boy Lake ran mostly within 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 Little Boy Lake?
Homes on Little Boy 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 Little Boy Lake and nearby lakes, including off-market opportunities when available.
What is it like to live on Little Boy Lake?
A mid-size lake with room for boating and fishing, about 32% shallow shoreline under 15 feet, and summer clarity around 10.9 feet. Conditions vary by property, so walk the frontage and ask us what similar homes have sold for.
Are there special fishing regulations on Little Boy Lake?
Yes. Northern pike 24 to 36 in must be released (one over 36 allowed).
Ask us about Little Boy 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.