Big LaSalle

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.

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.

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.

Based on Minnesota DNR survey data, anglers target Walleye, Rock Bass, Green Sunfish, Northern Pike, and Largemouth Bass in Big LaSalle. See the full species list above for catch rates, size structure, and quality scores.

Minnesota DNR records list public access for Big LaSalle. Check the DNR LakeFinder page for the launch type and directions before you go.

Big LaSalle has a maximum depth of 48 feet, per Minnesota DNR data.

The most recent Minnesota DNR survey data for the main sport fish in Big LaSalle is from 2021.

No invasive species are on record for Big LaSalle in Minnesota DNR data. Always clean, drain, and dry your equipment to help keep it that way.