Connia Slough
Connia Slough in McHenry County, North Dakota is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 620 acres.
- Area
- 620 acres
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Why Connia 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 Connia 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.
Connia Slough is a 620-acre lake in McHenry County, North Dakota.
Source: EPA Water Quality Portal sampling records, NDDEQ, last sampled recent years. Grade methodology: LakeQuality methodology.
Watch Connia 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 Connia 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 Connia Slough
Compare lakeside cabins, hotels, and vacation rentals near Connia Slough in McHenry 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 Connia Slough
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 620 acres |
No bathymetric survey has been published for Connia Slough, so its depth is not documented here.
Fishing Connia Slough
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Frequently asked questions about Connia Slough
Where is Connia Slough?
- Connia Slough is a lake in McHenry 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 Connia Slough?
- Connia Slough in McHenry County, North Dakota is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 620 acres.
Is Connia Slough safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Connia Slough is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Explore Connia Slough across LakeQuality
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Where this data comes from
Measurements for Connia 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