Silver Lake
Plymouth County, Massachusetts602 acresView mapDirections
Not enough samples to grade — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). No letter yet. Here is what we do have.
- Impaired · Habitat alterations
- 47 ft max depth
- Limited data
Silver Lake in Plymouth County, Massachusetts is not rated for water quality — its monitoring record does not meet the evidence bar. Chlorophyll-a (algae): 3 µg/L. Surface area: 602 acres.
- Max depth
- ~47 ft est.
- Area
- 602 acres
- Chlorophyll-a
- 3 µg/L
- Trend
- ↓ Declining
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Watch Silver Lake’s letter
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Why Silver 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 Silver Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded algae (chlorophyll-a), but not water clarity and phosphorus.
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.
Silver Lake is a 602-acre lake in Plymouth County, Massachusetts with an estimated average depth of about 47 feet. Overall water quality is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, MassDEP, last sampled 2013-08-27. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Silver Lake is listed impaired under Clean Water Act §303(d) (IR 5) for habitat alterations, hydrologic alteration, oxygen depletion (low DO). Check local advisories before you swim.
Water quality measurements for Silver Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Chlorophyll-a 3 µg/L. TSI 41.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 3 µg/L | Not graded |
| Trophic State Index (TSI) | 41 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~47 ft est. |
| Average Depth | ~21 ft est. |
| Surface Area | 602 acres |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Massachusetts has not published bathymetry for Silver Lake.
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Fishing Silver Lake
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Chlorophyll-a | ↓ Declining | +4.2 µg/L/yr | 2 |
Reservoir Info (USACE NID)
Silver Lake is a man-made reservoir impounded by the Silver Lake Dam (completed 1908), built primarily for water supply on the Jones River; earth-type dam, 8 ft tall and 110 ft long.
- Surface area
- 602 ac
- Normal storage
- 15,306 ac-ft
- Max storage
- 16,558 ac-ft
- Drainage area
- 4.23 sq mi
- Hazard class
- Low
- Owner
- City of Brockton
Source: USACE National Inventory of Dams, NID ID MA00432 · Operator website
EPA Impairment Status
Silver Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit MA94143 · Official waterbody report
Graded lakes near Silver Lake
Silver Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Plymouth County
Frequently asked questions about Silver Lake
Where is Silver Lake?
- Silver Lake is a lake in Plymouth County, Massachusetts. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for Silver Lake?
- Silver Lake in Plymouth County, Massachusetts is not rated for water quality — its monitoring record does not meet the evidence bar. Chlorophyll-a (algae): 3 µg/L. Surface area: 602 acres.
Is Silver Lake safe to swim in?
- The letter is not a swimming clearance. Silver Lake is listed impaired under Clean Water Act §303(d) (IR 5) for habitat alterations, hydrologic alteration, oxygen depletion (low DO). Check local advisories before you swim.
How deep is Silver Lake?
- No published bathymetric survey covers Silver Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 47 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 602 acres.
Explore Silver Lake across LakeQuality
Planning a trip around Cape Cod?
Silver Lake is about 40 miles from Cape Cod National Seashore. Crowds there swing hard by season, so the month you pick changes both how busy the park is and what lodging costs.
Best time to visit Cape Cod →More Massachusetts Lake Rankings
Other Lakes in Massachusetts
Mesotrophic Lakes in Massachusetts
Where this data comes from
1 measurement from 1 monitoring station, 2013. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Massachusetts Department of Environmental Protection (MassDEP)
MASSDEP1 sample · 2013
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
Lake size & watershed from HydroLAKES (HydroSHEDS)