Flour Lake
Cook County, Minnesota - DNR stocking history, depth and survey data
Minnesota · Minnesota Department of Natural Resources (DNR) · DOW 16014700
DNR records show 7 stocking entries at Flour Lake since 2016, most recently walleye fingerlings in 2024 (3,450 fish).
- Flour Lake has 7 DNR stocking records across 5 years (2016-2024): walleye (5), lake trout (2).
- The most-stocked species by count is walleye: 12,592 fish on record.
- Maximum depth 75 ft; surface area 330 acres, 115 littoral acres, 8.5 miles of shoreline, per the DNR lake survey.
- Average water clarity (Secchi depth) 15.4 ft.
- Fish species DNR lists here: cisco species, green sunfish, lake trout, northern pike, smallmouth bass, tullibee (cisco), walleye, white sucker, yellow perch.
- 4 public accesses on the DNR list.
- Most recent DNR fish survey: (targeted survey).
- Cook County, nearest town Grand Marais; DNR lake number (DOW) 16014700.
Depth map
Bathymetric contours from the Minnesota DNR lake survey mapped 5/19/1983 (orig map); depths in feet. Simplified for the web; not for navigation.
Stocking history
| Year | Species | Size | Number | Pounds |
|---|---|---|---|---|
| 2024 | Walleye2 | fingerlings | 3,450 | 115.0 |
| 2022 | Walleye2 | fingerlings | 1,496 | 138.5 |
| 2021 | Walleye2 | fingerlings | 2,058 | 114.3 |
| 2018 | Lake Trout | yearlings | 3,410 | 327.9 |
| 2018 | Walleye2 | fingerlings | 1,821 | 113.8 |
| 2016 | Lake Trout | yearlings | 4,279 | 401.4 |
| 2016 | Walleye2 | fingerlings | 3,767 | 229.7 |
2 fish purchased by the DNR for stocking.
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 | USF | In USFS campground on NW shore- off Co. Rd. 66. Parking available for |
| PO | USF | Portage trail from East Bearskin Lake. |
| PO | USF | Portage trail from Rudy Lake. |
| PO | USF | Portage trail from Moon Lake. |
DNR fish survey, 2025
Temperature and dissolved oxygen measurements were collected from the deepest basin in Flour Lake on August 13th, 2025. This was done to evaluate the quantity and quality of cold, oxygenated water (i.e., oxythermal habitat) available to Lake Trout, the most sensitive coldwater species present in this lake (Cisco, also known as 'Tullibee', are also present). Lake Trout require a layer of oxythermal habitat that contains water temperatures below 8.8 degrees C (47.8 degrees F) and dissolved oxygen concentrations above 3.0 mg/L. Based on data collected from the deepest basin (maximum sampled depth was 68.9 feet), the water temperature decreased to 8.8 degrees C (47.8 degrees F) at 34.1 feet and the dissolved oxygen concentration decreased to 3.0 mg/L at 68.6 feet at the time of sampling. This layer in the water column was 34.5 feet, indicating oxythermal habitat for Lake Trout was present. Further, the temperature at which dissolved oxygen decreased to 3.0 mg/L (i.e., TDO3, a single variable to characterize oxythermal habitat) was 7.3 degrees C (45.1 degrees F). TDO3 values cooler than 8.8 degrees C (47.8 degrees F) indicate that oxythermal conditions were suitable for Lake Trout at the time of the survey. It is possible Lake Trout still persist in low numbers in the lake, but none were found in the previous survey. Data collected by the Minnesota Department of Natural Resources during the period of maximum oxythermal stress (July 26th to Aug 24th) in 4 years, between 1956-2023, indicated suitable oxythermal habitat in most years surveyed. There did not appear to be any suitable habitat found in the 1956 survey. When adequate oxythermal habitat is not available, Lake Trout 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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