Long

Temperature and dissolved oxygen measurements were collected from the deepest basin in Long 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 (maximum sampled depth 47.9 feet), the water temperature decreased below 21.2 degrees C (70.2 degrees F) at 20.0 feet and the dissolved oxygen concentration decreased to 3.0 mg/L at 21.8 feet at the time of sampling. The thickness of this layer of water in the water column was 1.8 feet, indicating that oxythermal habitat was present but marginal 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 20.1 degrees C (68.2 degrees F). TDO3 values cooler than 21.2 degrees C (70.2 degrees F) indicate that oxythermal conditions were present but marginal for Cisco at the time of the survey as the layer was confined to less than 3 feet of suitable habitat 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 1993 and 2006 indicate unsuitable oxythermal habitat across both years, with the least favorable conditions recorded in 2006 when the suitable oxythermal habitat layer was 0 feet thick. When inadequate oxythermal habitat is available, Cisco are squeezed into unfavorable, warmer water conditions and experience higher levels of stress.

Temperature and dissolved oxygen measurements were collected from the deepest basin in Long 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 (maximum sampled depth 47.9 feet), the water temperature decreased below 21.2 degrees C (70.2 degrees F) at 20.0 feet and the dissolved oxygen concentration decreased to 3.0 mg/L at 21.8 feet at the time of sampling. The thickness of this layer of water in the water column was 1.8 feet, indicating that oxythermal habitat was present but marginal 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 20.1 degrees C (68.2 degrees F). TDO3 values cooler than 21.2 degrees C (70.2 degrees F) indicate that oxythermal conditions were present but marginal for Cisco at the time of the survey as the layer was confined to less than 3 feet of suitable habitat 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 1993 and 2006 indicate unsuitable oxythermal habitat across both years, with the least favorable conditions recorded in 2006 when the suitable oxythermal habitat layer was 0 feet thick. When inadequate oxythermal habitat is available, Cisco are squeezed into unfavorable, warmer water conditions and experience higher levels of stress.

Temperature and dissolved oxygen measurements were collected from the deepest basin in Long 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 (maximum sampled depth 47.9 feet), the water temperature decreased below 21.2 degrees C (70.2 degrees F) at 20.0 feet and the dissolved oxygen concentration decreased to 3.0 mg/L at 21.8 feet at the time of sampling. The thickness of this layer of water in the water column was 1.8 feet, indicating that oxythermal habitat was present but marginal 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 20.1 degrees C (68.2 degrees F). TDO3 values cooler than 21.2 degrees C (70.2 degrees F) indicate that oxythermal conditions were present but marginal for Cisco at the time of the survey as the layer was confined to less than 3 feet of suitable habitat 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 1993 and 2006 indicate unsuitable oxythermal habitat across both years, with the least favorable conditions recorded in 2006 when the suitable oxythermal habitat layer was 0 feet thick. When inadequate oxythermal habitat is available, Cisco are squeezed into unfavorable, warmer water conditions and experience higher levels of stress.

Based on Minnesota DNR survey data, anglers target Black Crappie, Largemouth Bass, Northern Pike, Hybrid Sunfish, and Green Sunfish in Long. See the full species list above for catch rates, size structure, and quality scores.

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

Long has a maximum depth of 63 feet and a mean depth of 40 feet, per Minnesota DNR data.

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

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

Yes — the 2026 Minnesota DNR regulations list 1 special rule for Long, covering northern pike. Special regulations override the statewide limits; see the fishing regulations section on this page. Verify current rules with the Minnesota DNR before keeping fish.