Island Lake
Cass County, Minnesota, near Longville. DNR lake ID 11025700.
Island Lake is a 184.3-acre lake in Cass County, Minnesota, near Longville. Its deepest point reaches 40 ft, and about 54% of the lake is shallower than 15 feet. Summer water clarity averages 16.5 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 northern pike, largemouth bass, black crappie, bluegill, yellow perch.
Buying or selling on Island Lake? Ask us what lakeshore here actually sells for, which stretches of shoreline buyers compete for, and what’s coming up before it’s listed.
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Quick facts
| DNR lake ID | 11025700 |
|---|---|
| County | Cass County, near Longville |
| Surface area | 184.3 acres |
| Maximum depth | 40 ft |
| Share under 15 ft | 54% |
| Water clarity (summer) | 16.5 ft through 2025 |
| Phosphorus (summer) | 10.3 µg/L |
| Algae, chlorophyll-a (summer) | 3.2 µg/L |
| Nutrient class | Oligotrophic |
| Clarity trend | Steady (2016 to 2025) |
| 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 16.5 ft, phosphorus 10.3 µg/L, algae (chlorophyll-a) 3.2 µg/L. Using the Carlson trophic state index, Island Lake rates as oligotrophic. Summer clarity trend 2016 to 2025: steady.
Fishing on Island Lake
The most recent DNR standard fish survey was in 2017 (9 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 |
|---|---|---|---|
| Northern pike | gill | 12.5 | 3.5 to 8.9 |
| Yellow perch | gill | 1.17 | 1.0 to 10.3 |
| Black crappie | gill | 5.17 | 1.0 to 3.9 |
| Bluegill | gill | 9.5 | n/a |
| Largemouth bass | gill | 4.5 | 0.4 to 1.6 |
| Pumpkinseed | gill | 3.5 | n/a |
| Rock bass | gill | 1.67 | 0.5 to 1.7 |
| Hybrid sunfish | gill | 0.33 | n/a |
Largest fish measured in recent DNR samples: Largemouth bass 17.0 in (2017), Northern pike 34.0 in (2017), Walleye 27.0 in (2002).
Game and panfish documented since 2005: Northern pike, Largemouth bass, Black crappie, Bluegill, Yellow perch, Pumpkinseed, Hybrid sunfish, Rock bass, Bowfin, 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
- Island Lake: 1 concrete slab launch ramp, 5 trailer spaces. 8 mi SW of Longville on MN Hwy. 84, then .25 mile North on Island View Road. Directions
DNR water access records (2023). Confirm current conditions with the DNR.
Nearby lakes
- Sand Lake 0.9 mi, Cass County
- Sand Lake 1.4 mi, Cass County
- Long Lake 1.4 mi, Cass County
- Ponto Lake 1.5 mi, Cass County
- Blackwater Lake 1.6 mi, Cass County
- Widow Lake 2.0 mi, Cass County
- Tamarack Lake 2.1 mi, Cass County
- One Lake 2.3 mi, Cass County
Questions about Island Lake
How deep is Island Lake?
Island Lake reaches a maximum depth of 40 ft according to Minnesota DNR records. About 54% of the lake is shallower than 15 feet.
How big is Island Lake?
Island Lake covers about 184.3 acres in Cass County, Minnesota.
How clear is Island Lake?
Summer water clarity on Island Lake averages 16.5 feet (Secchi depth) in MPCA monitoring through 2025. Its trophic state is oligotrophic.
Does Island Lake have zebra mussels or other invasive species?
Island 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 Island Lake?
Minnesota DNR surveys document northern pike, largemouth bass, black crappie, bluegill, yellow perch, pumpkinseed, hybrid sunfish, rock bass, bowfin, white sucker in Island Lake. The most recent standard survey was in 2017.
Where is the public boat access on Island Lake?
Island Lake has 1 public water access site on DNR record: Island Lake.
Are there lake homes for sale on Island Lake?
Homes on Island 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 Island Lake and nearby lakes, including off-market opportunities when available.
What is it like to live on Island Lake?
Small, quiet water suited to paddling and fishing, about 54% shallow shoreline under 15 feet, and summer clarity around 16.5 feet. Conditions vary by property, so walk the frontage and ask us what similar homes have sold for.
Are there special fishing regulations on Island Lake?
No lake-specific regulation was found for Island Lake in Minnesota Rules or the DNR sunfish list. Statewide and zone regulations apply.
Ask us about Island 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 2017), 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.