Gabbro

Temperature and dissolved oxygen (DO) measurements were collected from the deepest basin in Gabbro Lake on July 29th, 2025, 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 26.2 feet), the water temperature decreased below 21.2 degrees C (70.2 degrees F) at 20.7 feet and the dissolved oxygen concentration stayed greater than 3.0 mg/L throughout the entire sampled depth. The thickness of this layer of water in the water column was 5.7 feet, indicating that oxythermal habitat was present 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 never reached because dissolved oxygen remained above 3.0 mg/L throughout the sampled depths. In this case, the minimum temperature, 20.7 degrees C (69.3 degrees F), was substituted as TDO3. TDO3 values cooler than 21.2 degrees C (70.2 degrees F) indicate that oxythermal conditions were suitable for Cisco 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 2024 also indicates suitable oxythermal habitat, with the least favorable conditions recorded in 2024 when the suitable oxythermal habitat layer was 2.5 feet thick. When adequate oxythermal habitat is unavailable, Cisco are squeezed into unfavorable, warmer water conditions and experience higher levels of stress.

Temperature and dissolved oxygen (DO) measurements were collected from the deepest basin in Gabbro Lake on July 29th, 2025, 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 26.2 feet), the water temperature decreased below 21.2 degrees C (70.2 degrees F) at 20.7 feet and the dissolved oxygen concentration stayed greater than 3.0 mg/L throughout the entire sampled depth. The thickness of this layer of water in the water column was 5.7 feet, indicating that oxythermal habitat was present 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 never reached because dissolved oxygen remained above 3.0 mg/L throughout the sampled depths. In this case, the minimum temperature, 20.7 degrees C (69.3 degrees F), was substituted as TDO3. TDO3 values cooler than 21.2 degrees C (70.2 degrees F) indicate that oxythermal conditions were suitable for Cisco 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 2024 also indicates suitable oxythermal habitat, with the least favorable conditions recorded in 2024 when the suitable oxythermal habitat layer was 2.5 feet thick. When adequate oxythermal habitat is unavailable, Cisco are squeezed into unfavorable, warmer water conditions and experience higher levels of stress.

Temperature and dissolved oxygen (DO) measurements were collected from the deepest basin in Gabbro Lake on July 29th, 2025, 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 26.2 feet), the water temperature decreased below 21.2 degrees C (70.2 degrees F) at 20.7 feet and the dissolved oxygen concentration stayed greater than 3.0 mg/L throughout the entire sampled depth. The thickness of this layer of water in the water column was 5.7 feet, indicating that oxythermal habitat was present 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 never reached because dissolved oxygen remained above 3.0 mg/L throughout the sampled depths. In this case, the minimum temperature, 20.7 degrees C (69.3 degrees F), was substituted as TDO3. TDO3 values cooler than 21.2 degrees C (70.2 degrees F) indicate that oxythermal conditions were suitable for Cisco 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 2024 also indicates suitable oxythermal habitat, with the least favorable conditions recorded in 2024 when the suitable oxythermal habitat layer was 2.5 feet thick. When adequate oxythermal habitat is unavailable, Cisco are squeezed into unfavorable, warmer water conditions and experience higher levels of stress.

Based on Minnesota DNR survey data, anglers target Black Crappie, Northern Pike, Walleye, Yellow Perch, and Smallmouth Bass in Gabbro. 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 Gabbro. Check the DNR LakeFinder page for current access details before you go.

Gabbro has a maximum depth of 50 feet, per Minnesota DNR data.

The most recent Minnesota DNR survey data for the main sport fish in Gabbro is from 2016. Surveys this old should be treated with some caution — fish populations change over time.

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