Saganaga

Temperature and dissolved oxygen measurements were collected from the deepest basin in Saganaga Lake on August 7th, 2025. This was done to evaluate the quantity and quality of cold, oxygenated water (i.e., oxythermal habitat) available to Lake Trout, the most sensitive coldwater species present in this lake (Lake Whitefish and Cisco, also known as 'Tullibee', are also present). Lake Trout require a layer of oxythermal habitat that contains water temperatures below 8.8 degrees C (47.8 degrees F) and dissolved oxygen concentrations above 3.0 mg/L. Based on data collected from the deepest basin (maximum sampled depth was 89.9 feet), the water temperature decreased to 8.8 degrees C (47.8 degrees F) at 41.0 feet and the dissolved oxygen concentration decreased to 3.0 mg/L at 85.7 feet at the time of sampling. This layer in the water column was 44.7 feet, indicating oxythermal habitat for Lake Trout was present. Further, the temperature at which dissolved oxygen decreased to 3.0 mg/L (i.e., TDO3, a single variable to characterize oxythermal habitat) was 6.1 degrees C (43.0 degrees F). TDO3 values cooler than 8.8 degrees C (47.8 degrees F) indicate that oxythermal conditions were suitable for Lake Trout at the time of the survey. Data collected by the Minnesota Department of Natural Resources during the period of maximum oxythermal stress (July 26th to Aug 24th) in 10 years, between 1985-2024, indicated unsuitable oxythermal habitat in most years surveyed, with unfavorable conditions recored in 1992, 2008 when there was no suitable oxythermal habitat layer. When adequate oxythermal habitat is not available, Lake Trout 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 Saganaga Lake on August 7th, 2025. This was done to evaluate the quantity and quality of cold, oxygenated water (i.e., oxythermal habitat) available to Lake Trout, the most sensitive coldwater species present in this lake (Lake Whitefish and Cisco, also known as 'Tullibee', are also present). Lake Trout require a layer of oxythermal habitat that contains water temperatures below 8.8 degrees C (47.8 degrees F) and dissolved oxygen concentrations above 3.0 mg/L. Based on data collected from the deepest basin (maximum sampled depth was 89.9 feet), the water temperature decreased to 8.8 degrees C (47.8 degrees F) at 41.0 feet and the dissolved oxygen concentration decreased to 3.0 mg/L at 85.7 feet at the time of sampling. This layer in the water column was 44.7 feet, indicating oxythermal habitat for Lake Trout was present. Further, the temperature at which dissolved oxygen decreased to 3.0 mg/L (i.e., TDO3, a single variable to characterize oxythermal habitat) was 6.1 degrees C (43.0 degrees F). TDO3 values cooler than 8.8 degrees C (47.8 degrees F) indicate that oxythermal conditions were suitable for Lake Trout at the time of the survey. Data collected by the Minnesota Department of Natural Resources during the period of maximum oxythermal stress (July 26th to Aug 24th) in 10 years, between 1985-2024, indicated unsuitable oxythermal habitat in most years surveyed, with unfavorable conditions recored in 1992, 2008 when there was no suitable oxythermal habitat layer. When adequate oxythermal habitat is not available, Lake Trout are squeezed into unfavorable, warmer water conditions and experience higher levels of stress.

Saganaga Lake is 18,766 acres in size and the largest lake in the Grand Marais area. It is located at the end of the Gunflint Trail approximately 56 miles northwest of Grand Marais on the border of Minnesota and Ontario, Canada. Saganaga is currently managed for lake trout and walleye. The Minnesota waters of Saganaga Lake are currently under an experimental walleye regulation implemented in March 2015. That regulation established a bag limit of three fish, with a minimum size limit of 17 inches, and only one fish over 20 inches allowed in possession. The main goal for the regulation was to improve walleye recruitment and increase the walleye population that had declined considerably by the early 2000s. To help evaluate this regulation standard surveys were scheduled for 2017, 2020, and 2023. The walleye catch in gill nets fell below the management goal but was lightly higher than when the regulation was implemented. Walleye catch rates are still higher than in other similar area lakes. Walleye ranged between 8.3 to 29.2 inches with a mean length of 13.4 inches. More than 10% of walleye were larger than 20 inches in size, with some lunkers found close to 30 inches. Back calculated age estimates found a total of 9 year classes present, with the strongest year classes in 2020 and 2021. Fry stocking was conducted in 2021 and could have bolstered that year class but it is likely natural recruitment drives the walleye population. Walleye growth rates continue to be slightly faster than area averages with age 5 fish being over 17 inches in size. The lake trout catch in gill nets was slightly higher than previous surveys but was relatively low and did not meet the management goal. Lake trout collected ranged from 13.9 to 24.2 inches with an average length of 19.6 inches. Aging results found those fish came from 3 naturally reproduced year classes with the oldest individual being 16 years old. Northern pike catch rates were in the upper end of the normal range for the lake in 2023, and higher than similar lakes in the area. Size structure of the northern pike collected ranged from 19.9 to 36.3 inches with a mean length of 25.8 inches. Saganga Lake holds good numbers of northern pike with many of them large sized. Although anglers have reported catching more smallmouth bass, catch rates in gill net surveys have remained consistent over a couple of decades. Additional bass specific surveys may be needed to evaluate population growth. Smallmouth bass ranged from 10.6 to 17.1 inches with a mean length of 13.9 inches and should be of interest to anglers. Black crappie were sampled for the first time in Saganaga Lake in 2014 and were found again in the 2023 survey. Catch rates remain low, but indicate the population continues to persist. Black crappie were 7.6 to 11.6 inches in size with a good mean length of 9.5 inches. Fishable black crappie populations are uncommon in this area and provide a unique angling opportunity. In addition to lake trout, Saganaga Lake continues to support other cold-water fish species like cisco, lake whitefish, burbot, and rainbow smelt. Catch rates for cisco, lake whitefish, and rainbow smelt were relatively low, while burbot abundance was average for Saganaga lake in 2023. Although lower in abundance cisco and rainbow smelt should still provide good forage for lake trout. Anglers have been known to target lake whitefish and cisco in this lake with some success. Saganaga Lake is infested with the invasive zooplankton called spiny waterflea. Anglers leaving the lake should dry and clean their equipment thoroughly before moving to another lake to prevent the spread of this aquatic invasive species. Cook County, Minnesota lakes continue to be susceptible to aquatic invasive species introductions. Invasive species have the potential to significantly alter fish communities and overall lake health. Anglers should clean watercraft and fishing gear, drain all water, and dispose of unused bait in the trash to prevent accidental introductions.

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

Saganaga has a maximum depth of 280 feet, per Minnesota DNR data.

The most recent Minnesota DNR survey data for the main sport fish in Saganaga is from 2023.

Yes — Saganaga has confirmed spiny waterflea. Clean, drain, and dry your equipment to avoid spreading invasives to other waters.

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