Big LaSalle Lake

Clearwater County, Minnesota - DNR stocking history, depth and survey data

Minnesota · Minnesota Department of Natural Resources (DNR) · DOW 15000100

DNR records show 5 stocking entries at Big LaSalle Lake since 2017, most recently walleye yearlings in 2025 (373 fish).

• Big LaSalle Lake has 5 DNR stocking records across 5 years (2017-2025): walleye (5).
• The most-stocked species by count is walleye: 8,562 fish on record.
• Maximum depth 48 ft; surface area 235 acres, 40 littoral acres, 3.3 miles of shoreline, per the DNR lake survey.
• Average water clarity (Secchi depth) 8.7 ft.
• Fish species DNR lists here: black crappie, bluegill, brown bullhead, green sunfish, hybrid sunfish, largemouth bass, northern pike, pumpkinseed, rock bass, tullibee (cisco), walleye, white sucker, and 2 more.
• 1 public access on the DNR list.
• Most recent DNR fish survey: July 31, 2023 (targeted survey).
• Clearwater County, nearest town Lake Itasca; DNR lake number (DOW) 15000100.

Depth map

Bathymetric contours from the Minnesota DNR lake survey mapped 8/6/1969 (orig map); depths in feet. Simplified for the web; not for navigation.

Stocking history

Public accesses

DNR fish survey, 2023

A temperature-dissolved oxygen profile was collected in the deepest basin on Big LaSalle Lake on July 31, 2023, to evaluate the amount of cold, oxygenated water (i.e., oxythermal habitat) available to Cisco, also known as Tullibee. Based on the profile, the top of the thermocline (i.e., the location in the water column with the sharpest transition from warm to cold water) occurred at approximately 6 feet. Dissolved oxygen decreased to below 3.0 mg/L at 13.8 feet, which was just below the thermocline, at the time of sampling. The temperature at which dissolved oxygen decreased to below 3.0 mg/L (i.e., TDO3, a single variable to characterize oxythermal habitat) was 6.4°C (43.5°F). TDO3 values cooler than 21.5°C indicate that oxythermal conditions are favorable for Cisco. Dissolved oxygen concentrations within and below the thermocline indicate that suitable oxythermal habitat for Cisco was available across a range of depths at the time of sampling during the summer of 2023. Data collected in 1998-2020 further indicate suitable oxythermal habitat in most years. When adequate oxythermal habitat is available, Cisco are not squeezed into unfavorable, warmer water conditions and therefore do not experience higher levels of stress.

Minnesota DNR survey narrative, July 31, 2023.

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