Carnahan Lake
Cass County, Minnesota, near Longville. DNR lake ID 11018800.
Carnahan Lake is a 31.5-acre lake in Cass County, Minnesota, near Longville. Its deepest point reaches 25 ft, and about 67% of the lake is shallower than 15 feet. Summer water clarity averages 9.8 feet in Minnesota Pollution Control Agency monitoring. It is not on the DNR infested waters list as of September 2026.
Buying or selling on Carnahan 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.
Tell us about your dream home on Carnahan LakeWhat’s my Carnahan Lake property worth?Call (218) 656-6469
Quick facts
| DNR lake ID | 11018800 |
|---|---|
| County | Cass County, near Longville |
| Surface area | 31.5 acres |
| Maximum depth | 25 ft |
| Share under 15 ft | 67% |
| Water clarity (summer) | 9.8 ft through 2025 (satellite estimate) |
| Invasive species | Not on DNR infested waters list (Sept 2026) |
| Public water accesses | 0 |
Water quality
Summer averages from Minnesota Pollution Control Agency monitoring through 2025: clarity 9.8 ft.
Fishing on Carnahan Lake
The most recent DNR standard fish survey was in 1993 (33 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 | 1.0 | 0.5 to 3.8 |
| Northern pike | gill | 13.0 | 4.5 to 11.3 |
| Northern pike | trap | 4.0 | n/a |
| Black crappie | trap | 0.11 | 1.2 to 4.8 |
Walleye catch was within the typical range for similar lakes in that survey.
Largest fish measured in recent DNR samples: Northern pike 20.0 in (1993), Walleye 22.0 in (1993).
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
No public water access on DNR record.
Nearby lakes
- Broadwater Bay 0.9 mi, Cass County
- Hazel Lake 1.1 mi, Cass County
- Silver Lake 1.4 mi, Cass County
- Girl Lake 1.8 mi, Cass County
- Boxell Lake 2.0 mi, Cass County
- Primer Lake 2.4 mi, Cass County
- Woman Lake 2.6 mi, Cass County
- Barnum Lake 3.0 mi, Cass County
Questions about Carnahan Lake
How deep is Carnahan Lake?
Carnahan Lake reaches a maximum depth of 25 ft according to Minnesota DNR records. About 67% of the lake is shallower than 15 feet.
How big is Carnahan Lake?
Carnahan Lake covers about 31.5 acres in Cass County, Minnesota.
How clear is Carnahan Lake?
Summer water clarity on Carnahan Lake averages 9.8 feet (Secchi depth) in MPCA monitoring through 2025.
Does Carnahan Lake have zebra mussels or other invasive species?
Carnahan 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.
Are there lake homes for sale on Carnahan Lake?
Homes on Carnahan 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 Carnahan Lake and nearby lakes, including off-market opportunities when available.
What is it like to live on Carnahan Lake?
Small, quiet water suited to paddling and fishing, about 67% shallow shoreline under 15 feet, and summer clarity around 9.8 feet. Conditions vary by property, so walk the frontage and ask us what similar homes have sold for.
Are there special fishing regulations on Carnahan Lake?
No lake-specific regulation was found for Carnahan Lake in Minnesota Rules or the DNR sunfish list. Statewide and zone regulations apply.
Ask us about Carnahan 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 1993), 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.