Dahl Slough
Dahl Slough in Nelson County, North Dakota is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 249 acres.
- Area
- 249 acres
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Why Dahl Slough 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 Dahl Slough, no water-quality sampling on record for this lake.
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.
Dahl Slough is a 249-acre lake in Nelson County, North Dakota.
Source: EPA Water Quality Portal sampling records, NDDEQ, last sampled recent years. Grade methodology: LakeQuality methodology.
Watch Dahl Slough water quality
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Swimming Safety
Not ratedElevated nutrients
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Dahl Slough
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Trophic State Index: undefined.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) |
Where to stay near Dahl Slough
Compare lakeside cabins, hotels, and vacation rentals near Dahl Slough in Nelson County, North Dakota — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Dahl Slough
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 249 acres |
No bathymetric survey has been published for Dahl Slough, so its depth is not documented here.
Fishing Dahl Slough
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Frequently asked questions about Dahl Slough
Where is Dahl Slough?
- Dahl Slough is a lake in Nelson County, North Dakota. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Dahl Slough?
- Dahl Slough in Nelson County, North Dakota is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 249 acres.
Is Dahl Slough safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Dahl Slough is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
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Where this data comes from
Measurements for Dahl Slough come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Depth, fish, and access data from North Dakota Game & Fish