Rock Lake (Cass County)
Cass County, Minnesota - DNR stocking history, depth and survey data
Minnesota · Minnesota Department of Natural Resources (DNR) · DOW 11032400
DNR records show 5 stocking entries at Rock Lake (Cass County) since 2019, most recently black crappie adults in 2023 (20 fish).
- Rock Lake (Cass County) has 5 DNR stocking records across 3 years (2019-2023): walleye (2), black crappie (1), bluegill sunfish (1), largemouth bass (1).
- The most-stocked species by count is walleye: 430,000 fish on record.
- Maximum depth 17 ft; surface area 261 acres, 235 littoral acres, 3.4 miles of shoreline, per the DNR lake survey.
- Average water clarity (Secchi depth) 7.0 ft.
- Fish species DNR lists here: black crappie, bluegill, bowfin (dogfish), brown bullhead, hybrid sunfish, largemouth bass, northern pike, pumpkinseed, white sucker, yellow bullhead, yellow perch.
- 1 public access on the DNR list.
- Most recent DNR fish survey: (standard survey).
- Cass County, nearest town Casino; DNR lake number (DOW) 11032400.
Depth map
Bathymetric contours from the Minnesota DNR lake survey mapped 6/23/1965 (orig map); depths in feet. Simplified for the web; not for navigation.
Stocking history
| Year | Species | Size | Number | Pounds |
|---|---|---|---|---|
| 2023 | Black Crappie | adults | 20 | 8.0 |
| 2023 | Bluegill Sunfish | adults | 12 | 4.0 |
| 2023 | Largemouth Bass | adults | 145 | 75.0 |
| 2022 | Walleye | fry | 200,000 | 1.8 |
| 2019 | Walleye | fry | 230,000 | 1.9 |
Public accesses
| Type | Owner | Where |
|---|---|---|
| O | Minnesota DNR | - DNR ownership- Forestry west side of the lake T.134N R.30W S.9. |
DNR fish survey, 2025
| Species | Gear | Catch per net | Total catch | Avg lb |
|---|---|---|---|---|
| Yellow bullhead | Standard gill nets | 56.00 | 112 | 0.41 |
| Pumpkinseed | Standard gill nets | 22.50 | 45 | 0.07 |
| Yellow perch | Standard gill nets | 22.50 | 45 | 0.24 |
| Black crappie | Standard gill nets | 17.50 | 35 | 0.12 |
| Northern pike | Standard gill nets | 16.50 | 33 | 1.81 |
| Bluegill | Standard gill nets | 4.00 | 8 | 0.04 |
| Brown bullhead | Standard gill nets | 4.00 | 8 | 0.40 |
| Largemouth bass | Standard gill nets | 0.50 | 1 | 0.64 |
| Bluegill | Standard trap nets | 9.75 | 39 | 0.07 |
| Pumpkinseed | Standard trap nets | 6.50 | 26 | 0.07 |
| Black crappie | Standard trap nets | 2.25 | 9 | 0.20 |
| Yellow bullhead | Standard trap nets | 2.00 | 8 | 0.62 |
| Hybrid sunfish | Standard trap nets | 1.25 | 5 | 0.15 |
| Northern pike | Standard trap nets | 1.00 | 4 | 1.26 |
| Bowfin (dogfish) | Standard trap nets | 0.50 | 2 | 1.56 |
| Yellow perch | Standard trap nets | 0.25 | 1 | 0.12 |
Catch per net (CPUE) is the DNR survey's count per gill net or trap net set; higher means more of that species were sampled, not a fishing forecast. Top species per gear shown; where we have no verified common name for a DNR code, the code itself is shown.
Rock Lake is a 261 acre lake located three miles east of Casino in southern Cass County. Rock Lake has a maximum depth of 17 feet and is susceptible to partial winterkill events during severe winters with at least two partial kills happening in the past decade. The management plan calls for stocking Walleye fry (230,000) after severe winterkill events. Walleye were stocked in 2019 and 2022. No Walleye were sampled in this survey. A standard survey using gill nets and trap nets was conducted in August of 2025 to assess fish populations and provide angler information. Northern Pike had a gill net catch of 16.5/net. Fish ranged from 17.0 to 29.0 inches with an average of 20.2 inches. Northern Pike in the protected 22-26 inch slot made up 3% of the catch with 6% at least 26 inches in length. The population is dominated by young fish with age 2 and 3 fish making up 91% of the catch. Anglers can expect lots of action on smaller fish. Anglers will find plenty of Black Crappie in Rock, but they run on the small side. Gill nets had a catch of 17.5/net with fish ranging from 4.6 to 8.2 inches with an average of 5.9 inches. Trap nets had a catch of 2.3/net with fish ranging from 5.0 to 9.6 inches with an average of 6.9 inches. For both gear types combined, 14% of the catch was at least 8 inches in length. Bluegills had a trap net catch of 9.8/net. They also ran on the small side with fish ranging from 3.0 to 6.7 inches with an average of 4.6 inches. Anglers may want to target Yellow Perch in Rock. Fish ranged from 5.3 to 10.9 inches with an average of 7.7 inches. Yellow Perch at least 8 inches in length made up 47% of the catch. Other species sampled included Bowfin (Dogfish), Brown Bullhead, Hybrid Sunfish, Pumpkinseed, White Sucker and Yellow Bullhead.
Minnesota DNR survey narrative, .
All Minnesota stockings · every Minnesota lake with a page · state CSV · this lake on DNR LakeFinder
Hear when the states we cover post stockings
One email a week in season: which waters in the states we cover were stocked, straight from the state agencies' own postings. No spam, no fishing-gear ads in the mail.
Free · double opt-in · unsubscribe anytime · we store only your email.