Epping-Springbrook Dam-S Inlet Lake
Williams 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.
- Limited data
Epping-Springbrook Dam-S Inlet Lake in Williams County, North Dakota is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 699.5 µg/L. Chlorophyll-a (algae): 18.2 µg/L.
- Phosphorus
- 699.5 µg/L
- Chlorophyll-a
- 18.2 µg/L
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Watch Epping-Springbrook Dam-S Inlet Lake’s letter
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Why Epping-Springbrook Dam-S Inlet 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 Epping-Springbrook Dam-S Inlet Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded phosphorus and algae (chlorophyll-a), but not water clarity.
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.
Epping-Springbrook Dam-S Inlet Lake is a lake in Williams County, North Dakota.
Source: EPA Water Quality Portal sampling records, NDDEQ, last sampled 2023-07-16. 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 Epping-Springbrook Dam-S Inlet Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Phosphorus 699.5 µg/L. Chlorophyll-a 18.2 µg/L. TSI 79.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 699.5 µg/L | Not graded |
| Chlorophyll-a (Algae) | 18.2 µg/L | Not graded |
| Trophic State Index (TSI) | 79 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Fishing Epping-Springbrook Dam-S Inlet Lake
Graded lakes near Epping-Springbrook Dam-S Inlet Lake
Epping-Springbrook Dam-S Inlet Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Williams County
Frequently asked questions about Epping-Springbrook Dam-S Inlet Lake
Where is Epping-Springbrook Dam-S Inlet Lake?
- Epping-Springbrook Dam-S Inlet Lake is a lake in Williams 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 Epping-Springbrook Dam-S Inlet Lake?
- Epping-Springbrook Dam-S Inlet Lake in Williams County, North Dakota is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 699.5 µg/L. Chlorophyll-a (algae): 18.2 µg/L.
Is Epping-Springbrook Dam-S Inlet Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
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Where this data comes from
5 measurements from 1 monitoring station, 2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- North Dakota Department Of Environmental Quality
21NDHDWQ_WQX5 samples · 2023
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.