Little Saganaga

Little Saganaga Lake is a large, 1,627-acre lake with a maximum depth of 150 ft and is primarily managed for lake trout. Little Saganaga Lake lies entirely within the Boundary Waters Canoe Area Wilderness (BWACW) and is a part of the Rainy River Headwaters watershed. Access is difficult due to multiple portages from BWCAW entry point #52 (Round Lake) that require 1.7 miles of portaging, 7.0 miles of paddling, and totaling 8.9 miles of travel. In 2024, a standard survey was conducted using gillnets to assess the current fish community and update information on management species. Lake trout are the primary management species within Little Saganaga Lake and results from the 2024 survey met management goals. Lake trout catch rates were 0.5 fish/net and near the long-term average for the lake. Lake trout lengths ranged from 16.6 to 21.8 inches, with an average size of 20.2 inches. Quality sized lake trout (i.e. lake trout > 20.0 inches) are typically found in Little Saganaga Lake with fewer small fish present, and the 2024 survey mimicked these trends. Lake trout growth was slow, taking fish seven years to reach 16.0 inches on average. The oldest fish in the survey was aged at 19 years and was measured at 21.8 inches. Anglers looking to target lake trout within the BWCAW should not expect to catch large, trophy sized fish in Little Saganaga, but rather average numbers of medium sized fish. Northern pike are the secondary management species within Little Saganaga Lake, and the abundance was above management goals. The northern pike catch rate was 3.8 fish/net and have been slowly increasing over time. Northern pike lengths ranged from 9.1 to 26.3 inches and averaged 20.4 inches. Quality sized northern pike were present in Little Saganaga Lake, indicated by 46% of the fish exceeding 21.0 inches during the survey. However, no big northern pike were caught over 30.0 inches and did not meet the management goal with regards to size. Yellow perch abundance had decreased from the previous survey and was the lowest on record for the lake. The Yellow perch sampled were small and averaged only 4.2 inches. White sucker abundance was above average for the lake, but within the expected values for similar lakes. Burbot catches were low but comparable to previous surveys. Minnesota Lakes within Cook County 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 to these pristine waters within this part of the state.

Temperature and dissolved oxygen measurements were collected in the deepest basin in Little Saganaga on August 6, 2024, 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. During the summer, 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 the profile from the deepest basin, the water temperature dropped below 8.8 degrees C (47.8 degrees F) at 39.4 feet, and the dissolved oxygen concentration decreased to 3.0 mg/L at 103.9 feet at the time of sampling. The thickness of this layer in the water column was 64.5 feet, indicating that oxythermal habitat was present for Lake Trout. Further, the temperature at which dissolved oxygen decreased to 3.0 mg/L (i.e., TDO3, a single variable to characterize oxythermal habitat) was 5.4 degrees C (41.7 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. This is the first survey completed on Little Saganaga Lake during the late summer thermal stress period, however, data collected outside the thermal maximum period from 1987-2014 indicated suitable oxythermal habitat during those sampling periods. The least favorable conditions were recorded in 2011 when the suitable oxythermal habitat layer thickness was 21.4 feet. When inadequate oxythermal habitat is available, Lake Trout 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 Little Saganaga on August 6, 2024, 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. During the summer, 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 the profile from the deepest basin, the water temperature dropped below 8.8 degrees C (47.8 degrees F) at 39.4 feet, and the dissolved oxygen concentration decreased to 3.0 mg/L at 103.9 feet at the time of sampling. The thickness of this layer in the water column was 64.5 feet, indicating that oxythermal habitat was present for Lake Trout. Further, the temperature at which dissolved oxygen decreased to 3.0 mg/L (i.e., TDO3, a single variable to characterize oxythermal habitat) was 5.4 degrees C (41.7 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. This is the first survey completed on Little Saganaga Lake during the late summer thermal stress period, however, data collected outside the thermal maximum period from 1987-2014 indicated suitable oxythermal habitat during those sampling periods. The least favorable conditions were recorded in 2011 when the suitable oxythermal habitat layer thickness was 21.4 feet. When inadequate oxythermal habitat is available, Lake Trout are squeezed into unfavorable, warmer water conditions and experience higher levels of stress.

Based on Minnesota DNR survey data, anglers target Northern Pike, Yellow Perch, and Lake Trout in Little 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 Little Saganaga. Check the DNR LakeFinder page for current access details before you go.

Little Saganaga has a maximum depth of 150 feet, per Minnesota DNR data.

The most recent Minnesota DNR survey data for the main sport fish in Little Saganaga is from 2024.

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