Mons Lake
Todd County, Minnesota - DNR stocking history, depth and survey data
Minnesota · Minnesota Department of Natural Resources (DNR) · DOW 77002200
DNR records show 5 stocking entries at Mons Lake since 2017, most recently walleye adults in 2025 (72 fish).
- Mons Lake has 5 DNR stocking records across 5 years (2017-2025): walleye (5).
- The most-stocked species by count is walleye: 3,401 fish on record.
- Maximum depth 80 ft; surface area 95 acres, 21 littoral acres, 1.8 miles of shoreline, per the DNR lake survey.
- Average water clarity (Secchi depth) 15.3 ft.
- Fish species DNR lists here: black crappie, bluegill, bowfin (dogfish), brown bullhead, green sunfish, hybrid sunfish, largemouth bass, muskellunge, northern pike, pumpkinseed, tullibee (cisco), walleye, and 3 more.
- 1 public access on the DNR list.
- Most recent DNR fish survey: (targeted survey).
- Todd County, nearest town Swanville; DNR lake number (DOW) 77002200.
Depth map
Bathymetric contours from the Minnesota DNR lake survey mapped 7/23/1970 (orig map); depths in feet. Simplified for the web; not for navigation.
Stocking history
| Year | Species | Size | Number | Pounds |
|---|---|---|---|---|
| 2025 | Walleye | adults | 72 | 88.2 |
| 2023 | Walleye | fingerlings | 910 | 74.0 |
| 2021 | Walleye | adults | 213 | 97.0 |
| 2019 | Walleye | fingerlings | 2,100 | 70.0 |
| 2017 | Walleye | adults | 106 | 132.0 |
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 |
|---|---|---|
| concrete ramp | TOW | Located on the N side of lake |
DNR fish survey, 2024
Temperature and dissolved oxygen measurements were collected from the deepest basin in Mons Lake on August 15th, 2024, to evaluate the quantity and quality of cold, oxygenated water (i.e., oxythermal habitat) available to Cisco, also known as Tullibee, the most sensitive coldwater species present in this lake. During the summer, Cisco require a layer of oxythermal habitat that contains water temperatures below 21.2 degrees C (70.2 degrees F) and dissolved oxygen concentrations above 3.0 mg/L. Based on the profile from the deepest basin, the water temperature decreased below 21.2 degrees C (70.2 degrees F) at 15.4 feet and the dissolved oxygen concentration decreased to 3.0 mg/L at 22.7 feet at the time of sampling, samples were collected down to 42.0 of 80.0 feet due to lack of dissolved oxygen. The thickness of this layer of water in the water column was 7.3 feet, indicating that oxythermal habitat was present for Cisco. Further, the temperature at which dissolved oxygen decreased to 3.0 mg/L (i.e., TDO3, a single variable to characterize oxythermal habitat) was 11.5 degrees C (52.7 degrees F). TDO3 values cooler than 21.2 degrees C (70.2 degrees F) indicate that oxythermal conditions were suitable for Cisco at the time of the survey. Data collected by the Minnesota Department of Natural Resources during the late summer period of maximum oxythermal stress (July 26th to Aug 24th) in 7 years, between 1983-2023, also indicated suitable oxythermal habitat in all years surveyed, with the least favorable conditions recorded in 1983 when the suitable oxythermal habitat layer was 5.7 feet thick. When inadequate oxythermal habitat is available, Cisco are squeezed into unfavorable, warmer water conditions and experience higher levels of stress.
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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