Hehn-Schaffer Lake
Stutsman County, North DakotaView mapDirections
Not enough samples to grade — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). No letter yet. Here is what we do have.
- 18 ft max depth
- Public access
- Limited data
Hehn-Schaffer Lake in Stutsman County, North Dakota is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 6.6 ft visibility. Phosphorus: 36 µg/L. Chlorophyll-a (algae): 15.4 µg/L.
- Clarity
- 6.6 ft
- Typical in August
- 61°F
- Max depth
- ~18 ft est.
- Phosphorus
- 36 µg/L
- Chlorophyll-a
- 15.4 µg/L
- Public access
- Yes
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Watch Hehn-Schaffer Lake’s letter
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Why Hehn-Schaffer Lake has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Hehn-Schaffer Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded water clarity, phosphorus and algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. 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.
Hehn-Schaffer Lake is a lake in Stutsman County, North Dakota with an estimated average depth of about 18 feet. Limited fish-species data available. Public access is available.
Source: EPA Water Quality Portal sampling records, NDDEQ, last sampled 2021-10-08. 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 Hehn-Schaffer Lake
These readings exist but are not enough for an A–F grade — see why.
Murky, only visible to about 6.6 ft. Phosphorus 36 µg/L. Chlorophyll-a 15.4 µg/L. TSI 54.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6.6 ft | Not graded |
| Phosphorus | 36 µg/L | Not graded |
| Chlorophyll-a (Algae) | 15.4 µg/L | Not graded |
| Trophic State Index (TSI) | 54 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Water Temperature
Hehn-Schaffer Lake typically sits around 61°F at the surface in August. Summer average is about 60°F. Usually warmest in Aug (about 61°F) and coldest in May (about 45°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 16 field readings (2011–2021) via the EPA Water Quality Portal. See the full Hehn-Schaffer Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~18 ft est. |
| Average Depth | ~8 ft est. |
| Public Access | Yes |
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 Hehn-Schaffer Lake.
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 Hehn-Schaffer Lake
Graded lakes near Hehn-Schaffer Lake
Hehn-Schaffer Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Stutsman County
Frequently asked questions about Hehn-Schaffer Lake
Where is Hehn-Schaffer Lake?
- Hehn-Schaffer Lake is a lake in Stutsman 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 Hehn-Schaffer Lake?
- Hehn-Schaffer Lake in Stutsman County, North Dakota is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 6.6 ft visibility. Phosphorus: 36 µg/L. Chlorophyll-a (algae): 15.4 µg/L.
Is Hehn-Schaffer Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
What is the water temperature of Hehn-Schaffer Lake?
- Hehn-Schaffer Lake typically sits around 61°F at the surface in August, from 16 EPA Water Quality Portal field readings (2011–2021). That is a typical value for the month, not a live reading.
How deep is Hehn-Schaffer Lake?
- No published bathymetric survey covers Hehn-Schaffer Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 18 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
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Where this data comes from
10 measurements from 1 monitoring station, 2020–2021. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- North Dakota Department Of Environmental Quality
21NDHDWQ_WQX10 samples · 2020–2021
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