Andover Lake
Andover Lake in Tolland County, Connecticut is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 10.2 ft visibility. Surface area: 166 acres.
- Clarity
- 10.2 ft
- Area
- 166 acres
Why Andover 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 Andover 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.
Andover Lake is a 166-acre lake in Tolland County, Connecticut.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2020-10-05. Grade methodology: LakeGrade methodology.
Watch Andover 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 Andover Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Good clarity, visible to about 10.2 ft. Trophic State Index: 44.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10.2 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Andover Lake
Compare lakeside cabins, hotels, and vacation rentals near Andover Lake in Tolland County, Connecticut — 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 Andover Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 166 acres |
No bathymetric survey has been published for Andover Lake, so its depth is not documented here.
Fishing Andover Lake
Reservoir Info (USACE NID)
Andover Lake is a man-made reservoir impounded by the Andover Lake Dam (completed 1926), built primarily for recreation on the Cheney Brook; earth-type dam, 18 ft tall and 590 ft long.
- Surface area
- 166 ac
- Normal storage
- 0 ac-ft
- Max storage
- 1,460 ac-ft
- Drainage area
- 3.96 sq mi
- Hazard class
- Significant
- Owner
- Andover Lake Management Association
Source: USACE National Inventory of Dams, NID ID CT00624 · Operator website
Graded lakes near Andover Lake
Andover Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Tolland County
Frequently asked questions about Andover Lake
Where is Andover Lake?
- Andover Lake is a lake in Tolland County, Connecticut. LakeQuality has not rated this lake (UNRATED) — there is not enough recent sampling to assign a letter.
What is the water quality grade for Andover Lake?
- Andover Lake in Tolland County, Connecticut is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 10.2 ft visibility. Surface area: 166 acres.
Is Andover Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Andover 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 Andover Lake across LakeGrade
More Connecticut Lake Rankings
Other Lakes in Connecticut
Mesotrophic Lakes in Connecticut
Where this data comes from
5 measurements from 1 monitoring station, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- North American Lake Management Society
NALMS5 samples · 2020
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.