Rock Lake (Lyon County)
Lyon County, Minnesota - DNR stocking history, depth and survey data
Minnesota · Minnesota Department of Natural Resources (DNR) · DOW 42005200
DNR records show 5 stocking entries at Rock Lake (Lyon County) since 2016, most recently walleye fry in 2024 (219,000 fish).
- Rock Lake (Lyon County) has 5 DNR stocking records across 5 years (2016-2024): walleye (5).
- The most-stocked species by count is walleye: 1,274,793 fish on record.
- Maximum depth 8 ft; surface area 379 acres, 379 littoral acres, 3.9 miles of shoreline, per the DNR lake survey.
- Average water clarity (Secchi depth) 2.5 ft.
- Fish species DNR lists here: bigmouth buffalo, black bullhead, black crappie, channel catfish, common carp, green sunfish, orangespotted sunfish, walleye, white sucker, yellow perch.
- 2 public accesses on the DNR list.
- Most recent DNR fish survey: (targeted survey).
- Lyon County, nearest town Russell; DNR lake number (DOW) 42005200.
Depth map
Bathymetric contours from the Minnesota DNR lake survey (get source); depths in feet. Simplified for the web; not for navigation.
Stocking history
| Year | Species | Size | Number | Pounds |
|---|---|---|---|---|
| 2024 | Walleye | fry | 219,000 | 1.7 |
| 2022 | Walleye | fry | 211,000 | 1.7 |
| 2021 | Walleye | fry | 211,000 | 1.7 |
| 2018 | Walleye | fry | 211,000 | 1.8 |
| 2016 | Walleye | fry | 422,793 | 3.8 |
Public accesses
| Type | Owner | Where |
|---|---|---|
| concrete ramp | Minnesota DNR | STATE OWNED PUBLIC BOAT ACCESS ON SOUTH END OF THE LAKE. |
| gravel ramp | county | ACCESS OFF COUNTY ROAD ON NORTH END OF LAKE. |
DNR fish survey, 2025
| Species | Gear | Catch per net | Total catch | Avg lb |
|---|---|---|---|---|
| Walleye | Fall electrofishing | 132.00 | 66 | 0.00 |
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 439-acre, class 43 lake, located approximately 3 miles south of the City of Russell in Lyon County. Rock Lake is managed primarily for Walleye and secondarily for Yellow Perch. Lower Mississippi Strain Walleye were stocked in Rock Lake in 2016, 2018, 2021, 2022, and 2024. Walleye were not stocked in 2020 because of the COVID-19 pandemic, so Walleye were stocked in 2021 despite being an "off" year. A Walleye fry stocking evaluation using daytime electrofishing was conducted on September 11, 2025 to determine if natural reproduction of Walleye occurred during a non-stocked year in Rock Lake. Young-of-the-year (YOY) Walleye were captured at a rate of 132.0 per hour, which indicates that natural reproduction occurred in Rock Lake. Walleye fingerlings were 5.2 to 7. inches in length and averaged 5.4 inches. Assuming survival to Spring of 2026, the 2021 year class should be a strong year class in the Rock Lake Walleye population.
Minnesota DNR survey narrative, .
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