Rock Lake
Cass County, Minnesota, near Casino. DNR lake ID 11032400.
Rock Lake is a 261-acre lake in Cass County, Minnesota, near Casino. Its deepest point reaches 17 ft, and about 90% of the lake is shallower than 15 feet. Summer water clarity averages 6.0 feet in Minnesota Pollution Control Agency monitoring, which places it in the eutrophic nutrient class. It is not on the DNR infested waters list as of September 2026.
Buying or selling on Rock 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 | 11032400 |
|---|---|
| County | Cass County, near Casino |
| Surface area | 261 acres |
| Maximum depth | 17 ft |
| Share under 15 ft | 90% |
| Water clarity (summer) | 6.0 ft through 2023 |
| Phosphorus (summer) | 35.5 µg/L |
| Algae, chlorophyll-a (summer) | 11.5 µg/L |
| Nutrient class | Eutrophic |
| 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 2023: clarity 6.0 ft, phosphorus 35.5 µg/L, algae (chlorophyll-a) 11.5 µg/L. Using the Carlson trophic state index, Rock Lake rates as eutrophic.
Fishing on Rock Lake
The most recent DNR standard fish survey was in 1985 (41 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 | 11.0 | 1.5 to 5.8 |
| Walleye | trap | 0.33 | 0.3 to 0.8 |
| Northern pike | gill | 4.5 | 4.6 to 11.6 |
| Northern pike | trap | 0.33 | n/a |
| Black crappie | gill | 1.5 | 1.0 to 7.3 |
| Black crappie | trap | 4.0 | 0.8 to 6.5 |
| Bluegill | gill | 1.0 | n/a |
| Bluegill | trap | 15.0 | 2.5 to 25.0 |
| Pumpkinseed | gill | 11.5 | n/a |
| Pumpkinseed | trap | 109.33 | 1.4 to 8.6 |
| Rock bass | trap | 0.33 | 0.3 to 1.4 |
| Hybrid sunfish | gill | 0.5 | n/a |
| Hybrid sunfish | trap | 1.67 | n/a |
Walleye catch was above the typical range for similar lakes in that survey.
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
- Rock Lake: 1 concrete slab launch ramp, 1 dock, 6 trailer spaces. 6 miles North of Pillager on Cass Co. Rd. #1, then 1 mile West on Forestry Campground Road. Directions
DNR water access records (2023). Confirm current conditions with the DNR.
Nearby lakes
- Long Lake 1.3 mi, Cass County
- Beauty Lake 1.9 mi, Cass County
- Dead Horse Lake 2.2 mi, Cass County
- Shafer Lake 2.4 mi, Cass County
- Green Bass Lake 2.5 mi, Cass County
- Rice Lake 3.7 mi, Cass County
- Pillager Lake 4.0 mi, Cass County
- Agate Lake 5.3 mi, Cass County
Questions about Rock Lake
How deep is Rock Lake?
Rock Lake reaches a maximum depth of 17 ft according to Minnesota DNR records. About 90% of the lake is shallower than 15 feet.
How big is Rock Lake?
Rock Lake covers about 261 acres in Cass County, Minnesota.
How clear is Rock Lake?
Summer water clarity on Rock Lake averages 6.0 feet (Secchi depth) in MPCA monitoring through 2023. Its trophic state is eutrophic.
Does Rock Lake have zebra mussels or other invasive species?
Rock 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.
Where is the public boat access on Rock Lake?
Rock Lake has 1 public water access site on DNR record: Rock Lake.
Are there lake homes for sale on Rock Lake?
Homes on Rock 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 Rock Lake and nearby lakes, including off-market opportunities when available.
What is it like to live on Rock Lake?
Small, quiet water suited to paddling and fishing, about 90% shallow shoreline under 15 feet, and summer clarity around 6.0 feet. Conditions vary by property, so walk the frontage and ask us what similar homes have sold for.
Are there special fishing regulations on Rock Lake?
No lake-specific regulation was found for Rock Lake in Minnesota Rules or the DNR sunfish list. Statewide and zone regulations apply.
Ask us about Rock 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 1985), 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.