Lake Tobiason is a 53-acre mesotrophic lake in Steele County, North Dakota with a maximum depth of 15 feet (11-foot average). Water quality is graded C based on 1 sampling years through 2025. The lake supports 3 documented fish species including Northern Pike, Yellow Perch, and Walleye. Compared to the 2 other monitored lakes in Steele County, Lake Tobiason ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, North Dakota DNR, last sampled 2025-10-23. Grade methodology: LakeGrade methodology.
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Moderate clarity, visible to about 8.1 ft. Trophic State Index: 47.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 8.1 ft | C |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 47 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 14.7 ft |
| Average Depth | 10.7 ft |
| Surface Area | 53 acres |
| Shoreline Length | 1.4 mi |
Where to stay near Lake Tobiason
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Fish Species
Click a species to see every graded lake where it is documented.
Fishing Lake Tobiason
Water Temperature
Lake Tobiason averages about 73°F at the surface in summer, usually warmest in Jul (about 73°F) and coldest in Oct (about 48°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 8 field readings (2025–2025) via the EPA Water Quality Portal. See the full Lake Tobiason water temperature breakdown →
Location
County Ranking
Ranked #1 of 3 lakes in Steele County
Nearby Lakes in Steele County
Explore Lake Tobiason across LakeGrade
Fish species and top-graded lakes across North Dakota
Fish species and best lakes in Steele County
Species activity outlook by water temperature and season
Where to stay at North Dakota's top lakes, each with its grade
Moderate nutrients, good water quality
North Dakota's cleanest and most-polluted lakes, ranked
More North Dakota Lake Rankings
Other Grade C Lakes in North Dakota
Mesotrophic Lakes in North Dakota
More records, surveys & data sources
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Data Sources
Water quality data from the EPA Water Quality Portal
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Depth, fish, and access data from North Dakota Game & Fish
Most recent sample: 2025-10-23
Monitoring stations: 1