Rocky Gap Run Lake
Rocky Gap Run Lake in Allegany County, Maryland is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 13.1 ft visibility.
- Clarity
- 13.1 ft
- Trend
- ↑ Improving
Why Rocky Gap Run Lake has no grade
We grade a lake only when its monitoring record clears the evidence bar: 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 Rocky Gap Run Lake, the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity. Sampling here has recorded water clarity, but not 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 your state environmental agency and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Rocky Gap Run Lake is a lake in Allegany County, Maryland. Overall water quality is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2014-10-21. Grade methodology: LakeGrade methodology.
Watch Rocky Gap Run Lake water quality
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Rocky Gap Run Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Good clarity, visible to about 13.1 ft. Trophic State Index: 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 13.1 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 40 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Rocky Gap Run Lake
Compare lakeside cabins, hotels, and vacation rentals near Rocky Gap Run Lake in Allegany County, Maryland — 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 Rocky Gap Run Lake
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Fishing Rocky Gap Run Lake
Water Quality Trend: ↑ Improving
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.201 m/yr | 3 |
Nearby Lakes in Allegany County
Frequently asked questions about Rocky Gap Run Lake
What is the water quality grade for Rocky Gap Run Lake?
- Rocky Gap Run Lake in Allegany County, Maryland is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 13.1 ft visibility.
Is Rocky Gap Run Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Rocky Gap Run Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Explore Rocky Gap Run Lake across LakeGrade
More Maryland Lake Rankings
Other Lakes in Maryland
Mesotrophic Lakes in Maryland
Where this data comes from
126 measurements from 1 monitoring station, 2014. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples126 samples · 2014
Monitoring station identifiers (1)
Grade thresholds come from the U.S. EPA National Lakes Assessment 2022 Technical Support Document (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Data Sources
Water quality data from the EPA Water Quality Portal
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion
Most recent sample: 2014-10-21
Monitoring stations: 1