Johnson

Temperature and dissolved oxygen measurements were collected in the deepest basin in Johnson Lake on August 1, 2024 to evaluate the quantity and quality of cold, oxygenated water (i.e., oxythermal habitat) available to Lake Whitefish the most sensitive coldwater species present in this lake (Cisco also present). During the summer, Lake Whitefish require a layer of oxythermal habitat that contains water temperatures below 17.2 degrees C (63.0 degrees F) and dissolved oxygen concentrations above 3.0 mg/L. Based on the profile from the deepest basin, the water temperature decreased to below 17.2 degrees C (63.0 degrees F) at 26.7 feet and the dissolved oxygen concentration decreased to 3.0 mg/L at 71 feet at the time of sampling. The thickness of this layer of water in the water column was 44.4 feet, indicating that oxythermal habitat was present for Lake Whitefish. Further, the temperature at which dissolved oxygen decreased to 3.0 mg/L (i.e., TDO3, a single variable to characterize oxythermal habitat) was 7.4 degrees C (45.3 degrees F). TDO3 values cooler than 17.2 degrees C (63.0 degrees F) indicate that oxythermal conditions were suitable for Lake Whitefish at the time of the survey. Data collected by the Minnesota Department of Natural Resources during the late summer period of maximum oxythermal stress in 2023, 2016, and 2014 also indicated suitable oxythermal habitat in all years. When inadequate oxythermal habitat is available, Lake Whitefish are squeezed into unfavorable, warmer water conditions and experience higher levels of stress.

Temperature and dissolved oxygen measurements were collected in the deepest basin in Johnson Lake on August 1, 2024 to evaluate the quantity and quality of cold, oxygenated water (i.e., oxythermal habitat) available to Lake Whitefish the most sensitive coldwater species present in this lake (Cisco also present). During the summer, Lake Whitefish require a layer of oxythermal habitat that contains water temperatures below 17.2 degrees C (63.0 degrees F) and dissolved oxygen concentrations above 3.0 mg/L. Based on the profile from the deepest basin, the water temperature decreased to below 17.2 degrees C (63.0 degrees F) at 26.7 feet and the dissolved oxygen concentration decreased to 3.0 mg/L at 71 feet at the time of sampling. The thickness of this layer of water in the water column was 44.4 feet, indicating that oxythermal habitat was present for Lake Whitefish. Further, the temperature at which dissolved oxygen decreased to 3.0 mg/L (i.e., TDO3, a single variable to characterize oxythermal habitat) was 7.4 degrees C (45.3 degrees F). TDO3 values cooler than 17.2 degrees C (63.0 degrees F) indicate that oxythermal conditions were suitable for Lake Whitefish at the time of the survey. Data collected by the Minnesota Department of Natural Resources during the late summer period of maximum oxythermal stress in 2023, 2016, and 2014 also indicated suitable oxythermal habitat in all years. When inadequate oxythermal habitat is available, Lake Whitefish are squeezed into unfavorable, warmer water conditions and experience higher levels of stress.

Temperature and dissolved oxygen measurements were collected in the deepest basin in Johnson Lake on August 1, 2024 to evaluate the quantity and quality of cold, oxygenated water (i.e., oxythermal habitat) available to Lake Whitefish the most sensitive coldwater species present in this lake (Cisco also present). During the summer, Lake Whitefish require a layer of oxythermal habitat that contains water temperatures below 17.2 degrees C (63.0 degrees F) and dissolved oxygen concentrations above 3.0 mg/L. Based on the profile from the deepest basin, the water temperature decreased to below 17.2 degrees C (63.0 degrees F) at 26.7 feet and the dissolved oxygen concentration decreased to 3.0 mg/L at 71 feet at the time of sampling. The thickness of this layer of water in the water column was 44.4 feet, indicating that oxythermal habitat was present for Lake Whitefish. Further, the temperature at which dissolved oxygen decreased to 3.0 mg/L (i.e., TDO3, a single variable to characterize oxythermal habitat) was 7.4 degrees C (45.3 degrees F). TDO3 values cooler than 17.2 degrees C (63.0 degrees F) indicate that oxythermal conditions were suitable for Lake Whitefish at the time of the survey. Data collected by the Minnesota Department of Natural Resources during the late summer period of maximum oxythermal stress in 2023, 2016, and 2014 also indicated suitable oxythermal habitat in all years. When inadequate oxythermal habitat is available, Lake Whitefish are squeezed into unfavorable, warmer water conditions and experience higher levels of stress.

Based on Minnesota DNR survey data, anglers target Northern Pike, Walleye, Lake Trout, Rock Bass, and Smallmouth Bass in Johnson. See the full species list above for catch rates, size structure, and quality scores.

We don't have a confirmed public access point on record for Johnson. Check the DNR LakeFinder page for current access details before you go.

Johnson has a maximum depth of 88 feet and a mean depth of 24.5 feet, per Minnesota DNR data.

The most recent Minnesota DNR survey data for the main sport fish in Johnson is from 2022.

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