Lake Tobiason
Steele County, North DakotaView mapDirections
Not Rated: one monitoring station are on record, but they measured water clarity only. LakeQuality’s A–F method grades total phosphorus, total nitrogen, chlorophyll-a, and turbidity; clarity is shown, not scored.
- 31 ft max depth
- Limited data
Lake Tobiason in Steele County, North Dakota is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 8.1 ft visibility.
- Clarity
- 8.1 ft
- Typical in October
- 48°F
- Max depth
- ~31 ft est.
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Stays near Lake Tobiason
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Watch Lake Tobiason’s letter
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Why Lake Tobiason has no grade
Lake Tobiason has monitoring on record from one station, but only water clarity was measured. LakeQuality’s A–F letter uses total phosphorus, total nitrogen, chlorophyll-a, and turbidity against EPA National Lakes Assessment condition classes. With none of those grading measurements on record, Lake Tobiason is Not Rated — not an F. Its 8.1-foot median from 8 readings collected 2025 is still shown as clarity, but clarity alone cannot earn a letter.
Not Rated is EPA Integrated Reporting Category 3 — insufficient information. Everything below that has been measured is still reported on this page.
Sampling is run by NDDEQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Lake Tobiason is a lake in Steele County, North Dakota with an estimated average depth of about 31 feet.
Source: EPA Water Quality Portal sampling records, NDDEQ, last sampled 2025-10-23. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Lake Tobiason
These readings exist but are not enough for an A–F grade — see why.
Moderate clarity, visible to about 8.1 ft. TSI 47.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 8.1 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 47 | Mesotrophic |
Moderate nutrients, good water quality
Water Temperature
Lake Tobiason typically sits around 48°F at the surface in October. Summer average is about 73°F. 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 →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~31 ft est. |
| Average Depth | ~6 ft est. |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. North Dakota has not published bathymetry for Lake Tobiason.
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Fishing Lake Tobiason
Graded lakes near Lake Tobiason
Lake Tobiason has no grade, but these lakes within a short drive do.
Nearby Lakes in Steele County
Frequently asked questions about Lake Tobiason
Where is Lake Tobiason?
- Lake Tobiason is a lake in Steele County, North Dakota. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for Lake Tobiason?
- Lake Tobiason in Steele County, North Dakota is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 8.1 ft visibility.
Is Lake Tobiason safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
What is the water temperature of Lake Tobiason?
- Lake Tobiason typically sits around 48°F at the surface in October, from 8 EPA Water Quality Portal field readings (2025–2025). That is a typical value for the month, not a live reading.
How deep is Lake Tobiason?
- No published bathymetric survey covers Lake Tobiason, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 31 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Explore Lake Tobiason across LakeQuality
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Where this data comes from
8 measurements from 1 monitoring station, 2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- North Dakota Department Of Environmental Quality
21NDHDWQ_WQX8 samples · 2025
Analytical methods
- Phosphorus by Colorimetry
- 447.0 ~ EPA; Chlorophyll a and b in phytoplankton by HPLC/UV
- 4500 NO3 E ~ Nitrate in Water- Cadmium Reduction
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)
Depth, fish, and access data from North Dakota Game & Fish