Spearhead Lake

Hubbard County, Minnesota - DNR stocking history, depth and survey data

Minnesota · Minnesota Department of Natural Resources (DNR) · DOW 29023900

Spearhead Lake has no DNR stocking rows in LakeFinder; this page carries its DNR depth, access and survey data.

• Spearhead Lake shows no stocking records in Minnesota DNR LakeFinder as of September 2, 2026.
• Maximum depth 81 ft; surface area 194 acres, 22 littoral acres, 3.9 miles of shoreline, per the DNR lake survey.
• Average water clarity (Secchi depth) 10.5 ft.
• Fish species DNR lists here: black bullhead, black crappie, bluegill, bowfin (dogfish), brown bullhead, green sunfish, hybrid sunfish, largemouth bass, northern pike, northern sunfish, pumpkinseed, rock bass, and 5 more.
• Most recent DNR fish survey: July 31, 2025 (targeted survey).
• Hubbard County, nearest town Becida; DNR lake number (DOW) 29023900.

Depth map

Bathymetric contours from the Minnesota DNR lake survey; depths in feet. Simplified for the web; not for navigation.

DNR fish survey, 2025

Temperature and dissolved oxygen measurements were collected from the deepest basin in Spearhead Lake on July 30th, 2025. This was done 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. 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 data collected from the deepest basin (maximum sampled depth was 80.0 feet), the water temperature decreased to 21.2 degrees C (70.2 degrees F) at 16.1 feet and the dissolved oxygen concentration decreased to 3.0 mg/L at 25.3 feet at the time of sampling. This layer in the water column was 9.2 feet, indicating oxythermal habitat for Cisco 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 12.7 degrees C (54.9 degrees F). 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 period of maximum oxythermal stress (July 26th to Aug 24th) in 2022 and 2023 also indicated suitable oxythermal habitat in all years surveyed, with the least favorable conditions recorded in 2022 when the suitable oxythermal habitat layer was 8.4 feet thick. When adequate oxythermal habitat is not available, Cisco are squeezed into unfavorable, warmer water conditions and experience higher levels of stress.

Minnesota DNR survey narrative, July 31, 2025.

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