Cobble Mountain Reservoir
Cobble Mountain Reservoir in Hampden County, Massachusetts is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 1066 acres.
- Area
- 1,066 acres
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Why Cobble Mountain Reservoir 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 Cobble Mountain Reservoir, 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 MassDEP and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Cobble Mountain Reservoir is a 1,066-acre lake in Hampden County, Massachusetts.
Source: EPA Water Quality Portal sampling records, MassDEP, last sampled recent years. Grade methodology: LakeQuality methodology.
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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 Cobble Mountain Reservoir
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 Cobble Mountain Reservoir
Compare lakeside cabins, hotels, and vacation rentals near Cobble Mountain Reservoir in Hampden County, Massachusetts — 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 Cobble Mountain Reservoir
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 1,066 acres |
No bathymetric survey has been published for Cobble Mountain Reservoir, so its depth is not documented here.
Fishing Cobble Mountain Reservoir
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Frequently asked questions about Cobble Mountain Reservoir
Where is Cobble Mountain Reservoir?
- Cobble Mountain Reservoir is a lake in Hampden County, Massachusetts. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Cobble Mountain Reservoir?
- Cobble Mountain Reservoir in Hampden County, Massachusetts is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 1066 acres.
Is Cobble Mountain Reservoir safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Cobble Mountain Reservoir 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 Cobble Mountain Reservoir come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.