Mule Lake (Cass County)
Cass County, Minnesota - DNR stocking history, depth and survey data
Minnesota · Minnesota Department of Natural Resources (DNR) · DOW 11020000
DNR records show 12 stocking entries at Mule Lake (Cass County) since 2016, most recently walleye yearlings in 2024 (784 fish).
- Mule Lake (Cass County) has 12 DNR stocking records across 7 years (2016-2024): walleye (12).
- The most-stocked species by count is walleye: 1,070,603 fish on record.
- Maximum depth 47 ft; surface area 525 acres, 182 littoral acres, 7.3 miles of shoreline, per the DNR lake survey.
- Average water clarity (Secchi depth) 18.4 ft.
- Fish species DNR lists here: black crappie, bluegill, hybrid sunfish, largemouth bass, northern pike, pumpkinseed, rock bass, smallmouth bass, walleye, white sucker, yellow perch.
- 2 public accesses on the DNR list.
- Most recent DNR fish survey: (standard survey).
- Cass County, nearest town Longville; DNR lake number (DOW) 11020000.
Depth map
Bathymetric contours from the Minnesota DNR lake survey mapped 5/18/1951 (orig map); depths in feet. Simplified for the web; not for navigation.
Stocking history
| Year | Species | Size | Number | Pounds |
|---|---|---|---|---|
| 2024 | Walleye | yearlings | 784 | 200.0 |
| 2024 | Walleye | fry | 464,580 | 3.9 |
| 2023 | Walleye | fry | 600,750 | 4.9 |
| 2022 | Walleye | adults | 190 | 380.0 |
| 2021 | Walleye1 | yearlings | 1,820 | 182.0 |
| 2020 | Walleye | yearlings | 465 | 93.0 |
| 2020 | Walleye | adults | 136 | 271.0 |
| 2018 | Walleye | adults | 155 | 211.0 |
| 2018 | Walleye | yearlings | 510 | 296.0 |
| 2018 | Walleye | fingerlings | 572 | 44.0 |
| 2016 | Walleye | fingerlings | 93 | 3.0 |
| 2016 | Walleye | adults | 548 | 479.0 |
1 fish purchased and stocked by private citizens and sporting groups.
Field note · Minnesota stocks by year, not by truck day: walleye fry go in within weeks of ice-out, fingerlings and yearlings mostly in fall, and stream trout in spring and fall. A row here means the fish went in during that year; DNR adds the year's rows after the fact, so the current year can look empty until winter.
Public accesses
| Type | Owner | Where |
|---|---|---|
| asphalt ramp | Minnesota DNR | West side directly off State Hwy 84. |
| gravel ramp | Minnesota DNR | old public access - north end |
DNR fish survey, 2023
| Species | Gear | Catch per net | Total catch | Avg lb |
|---|---|---|---|---|
| Largemouth bass | Standard electrofishing | 69.00 | 138 | 1.31 |
| Smallmouth bass | Standard electrofishing | 13.00 | 26 | 2.57 |
| Northern pike | Standard gill nets | 26.56 | 239 | 0.89 |
| Bluegill | Standard gill nets | 10.11 | 91 | 0.19 |
| Yellow perch | Standard gill nets | 6.78 | 61 | 0.20 |
| Rock bass | Standard gill nets | 5.78 | 52 | 0.42 |
| Black crappie | Standard gill nets | 4.67 | 42 | 0.39 |
| Largemouth bass | Standard gill nets | 4.56 | 41 | 0.90 |
| Walleye | Standard gill nets | 2.56 | 23 | 2.36 |
| Pumpkinseed | Standard gill nets | 1.56 | 14 | 0.05 |
| Bluegill | Standard trap nets | 17.33 | 156 | 0.26 |
| Northern pike | Standard trap nets | 0.78 | 7 | 1.09 |
| Rock bass | Standard trap nets | 0.67 | 6 | 0.31 |
| Black crappie | Standard trap nets | 0.56 | 5 | 0.24 |
| Pumpkinseed | Standard trap nets | 0.33 | 3 | 0.07 |
| Yellow perch | Standard trap nets | 0.11 | 1 | 0.07 |
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.
Mule Lake is a 525-acre lake with 7.31 miles of shoreline and a maximum depth of 47 feet located south of Longville, MN. A DNR owned public access is located on the western shore. The DNR has classified Minnesota's lakes into 43 different classes based on physical, chemical, and other characteristics. Mule Lake is in Lake Class 23; lakes in this class are generally deep and clear. Other area lakes in this class include Jack, Ponto, Stony, and Baby. The entire east shore is publicly owned and undeveloped. The lake is primarily managed for Northern Pike, Walleye, and Yellow Perch and secondarily for Smallmouth Bass, Largemouth Bass, Bluegill, and Black Crappie. An experimental catch and release regulation for Largemouth and Smallmouth Bass was modified in 2016 to a 14-20-inch protected slot limit with 1 over 20 inches in possession. The regulation was removed in 2021. Other regulations include an ongoing Walleye possession limit of 3 fish. Northern Pike catch rates were the highest ever observed with an average length and weight of 16.3 inches and 0.89 pounds. Walleye abundance has remained stable at roughly 3 fish per net and lengths ranged from 15 to 29 inches. Yellow Perch numbers in Mule are low compared to similar lakes, though were higher in 2023 than the previous eight surveys. Smallmouth Bass catch rate in the spring was a record high with fish up to 19 inches long sampled. Largemouth Bass catch rates resembled previous assessments with fish up to 17 inches sampled. Bluegill abundance was moderate, with an average size of 6 inches and over 9 inches sampled. Black Crappie were abundant, with an average length of 8 inches and fish up to 11 inches sampled. Other fish species that anglers can expect to encounter in Mule Lake include Pumpkinseed, Rock Bass, and White Sucker. People can have significant impacts on lakes and the fish populations they support. Harvest, lakeshore development, removal of shoreline vegetation, and introductions of invasive species can all adversely affect fish populations. Currently, no aquatic invasive species (AIS) have been identified in Mule Lake. AIS are moved from infested to non-infested waters by anglers, boaters, and lake shore owners and can adversely impact lakes and fish populations. To avoid spreading AIS, lake users are required to remove all aquatic plants or animals from their watercraft and drain all water from their boat before leaving the access. If you suspect an infestation of an invasive species in this lake, save a specimen and report it to a local natural resource office. Additional information on…
Minnesota DNR survey narrative, .
All Minnesota stockings · every Minnesota lake with a page · state CSV · this lake on DNR LakeFinder
Stocking rows, depths, accesses and survey figures are Minnesota DNR LakeFinder data as of 2026-09-02; contours are the DNR bathymetric survey. Regulations, slot limits and special rules are on the DNR page linked above, not here.
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