Cowan Lake
Cowan Lake in Clinton County, Ohio is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 696 acres.
- Area
- 696 acres
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Why Cowan 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 Cowan Lake, 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 Ohio EPA and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Cowan Lake is a 696-acre lake in Clinton County, Ohio.
Source: EPA Water Quality Portal sampling records, Ohio EPA, last sampled recent years. Grade methodology: LakeQuality methodology.
Watch Cowan Lake 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 Cowan Lake
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 Cowan Lake
Compare lakeside cabins, hotels, and vacation rentals near Cowan Lake in Clinton County, Ohio — 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 Cowan Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 696 acres |
No bathymetric survey has been published for Cowan Lake, so its depth is not documented here.
Fishing Cowan Lake
Nearby Lakes in Clinton County
Frequently asked questions about Cowan Lake
Where is Cowan Lake?
- Cowan Lake is a lake in Clinton County, Ohio. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Cowan Lake?
- Cowan Lake in Clinton County, Ohio is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 696 acres.
Is Cowan Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Cowan Lake 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 Cowan Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.