Card Pond
Berkshire County, Massachusetts30 acresView mapDirections
Clarity, phosphorus, and algae all sit in the cleanest band for this region.
- Mesotrophic
- Impaired · Algal growth
- #1 of 8 in the county
- Public access
- Limited data
Card Pond in Berkshire County, Massachusetts has a water quality grade of A (Excellent). Chlorophyll-a (algae): 3.4 µg/L. Surface area: 30.1 acres.
- Area
- 30 acres
- Type
- Mesotrophic
- Chlorophyll-a
- 3.4 µg/L
- Public access
- Yes
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Watch Card Pond’s letter
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Card Pond is a 30-acre mesotrophic lake in Berkshire County, Massachusetts. Water quality is graded A based on 1 sampling years through 2016. Limited fish-species data available. Public access is available. Compared to the 7 other monitored lakes in Berkshire County, Card Pond ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, MassDEP, last sampled 2016-09-20. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The A is nutrients and algae, not a swimming clearance. Card Pond is listed impaired under Clean Water Act §303(d) (IR 4C) for algal growth, noxious aquatic plants, nuisance exotic species. Check local advisories before you swim.
Water Quality Grade: A (Excellent)
No clarity data. Chlorophyll-a 3.4 µg/L. TSI 43. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 3.4 µg/L | Good |
| Trophic State Index (TSI) | 43 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 30 acres |
| Public Access | Yes |
No bathymetric survey has been published for Card Pond, so its depth is not documented here.
Fishing Card Pond
Reservoir Info (USACE NID)
Card Pond is a man-made reservoir impounded by the Shaker Mill Pond Dam (completed 1910), built primarily for recreation on the Williams River; earth-type dam, 18 ft tall and 100 ft long.
- Surface area
- 30.1 ac
- Normal storage
- 119 ac-ft
- Max storage
- 466 ac-ft
- Drainage area
- 32.6 sq mi
- Hazard class
- High
- Owner
- Town of West Stockbridge
Source: USACE National Inventory of Dams, NID ID MA00732 · Operator website · Matched by proximity (0.77 km)
EPA Impairment Status
Card Pond is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4C).
Causes of impairment
Source: EPA ATTAINS assessment unit MA21094 · Official waterbody report · Matched by proximity (1.36 km)
County Ranking
Ranked #1 of 8 lakes in Berkshire County
Nearby Lakes in Berkshire County
Frequently asked questions about Card Pond
Where is Card Pond?
- Card Pond is a lake in Berkshire County, Massachusetts. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Card Pond?
- Card Pond in Berkshire County, Massachusetts has a water quality grade of A (Excellent). Chlorophyll-a (algae): 3.4 µg/L. Surface area: 30.1 acres.
Is Card Pond safe to swim in?
- The A is nutrients and algae, not a swimming clearance. Card Pond is listed impaired under Clean Water Act §303(d) (IR 4C) for algal growth, noxious aquatic plants, nuisance exotic species. Check local advisories before you swim.
Explore Card Pond across LakeQuality
10.5 mi away · recorded at 72°F
Species activity outlook by water temperature and season
Where to stay at Massachusetts's top lakes, each with its grade
Moderate nutrients, good water quality
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Where this data comes from
3 measurements from 1 monitoring station, 2016. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Massachusetts Department of Environmental Protection (MassDEP)
MASSDEP3 samples · 2016
Analytical methods
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database