Lake Quinsigamond
Worcester County, Massachusetts2 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 · Algal growth
- 37 ft max depth
- Public access
- Limited data
Lake Quinsigamond in Worcester County, Massachusetts is not rated for water quality — its monitoring record does not meet the evidence bar. Chlorophyll-a (algae): 2.5 µg/L. Surface area: 1.5 acres.
- Max depth
- ~37 ft est.
- Area
- 2 acres
- Chlorophyll-a
- 2.5 µg/L
- Public access
- Yes
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Watch Lake Quinsigamond’s letter
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Why Lake Quinsigamond 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 Lake Quinsigamond, 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.
Lake Quinsigamond is a 2-acre lake in Worcester County, Massachusetts with an estimated average depth of about 37 feet. Limited fish-species data available. Public access is available.
Source: EPA Water Quality Portal sampling records, MassDEP, last sampled 2018-07-13. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedBacteria advisory
The letter is not a swimming clearance. Lake Quinsigamond is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, noxious aquatic plants, nuisance exotic species, oxygen depletion (low DO), pathogens (E. coli, fecal). Check local advisories before you swim.
Water quality measurements for Lake Quinsigamond
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Chlorophyll-a 2.5 µg/L. TSI 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 2.5 µg/L | Not graded |
| Trophic State Index (TSI) | 40 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~37 ft est. |
| Average Depth | ~18 ft est. |
| Surface Area | 2 acres |
| Public Access | Yes |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Massachusetts has not published bathymetry for Lake Quinsigamond.
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 Lake Quinsigamond
Reservoir Info (USACE NID)
Lake Quinsigamond is a man-made reservoir impounded by the Quinsigamond Pond Dam (completed 1896), built primarily for recreation on the Blackstone River; stone-type dam, 12 ft tall and 180 ft long.
- Surface area
- 1.5 ac
- Normal storage
- 2.3 ac-ft
- Max storage
- 61.3 ac-ft
- Drainage area
- 50 sq mi
- Hazard class
- Significant
- Owner
- City of Worcester
Source: USACE National Inventory of Dams, NID ID MA00139 · Operator website
EPA Impairment Status
Lake Quinsigamond is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MA51125 · Official waterbody report
Graded lakes near Lake Quinsigamond
Lake Quinsigamond has no grade, but these lakes within a short drive do.
Nearby Lakes in Worcester County
Frequently asked questions about Lake Quinsigamond
Where is Lake Quinsigamond?
- Lake Quinsigamond is a lake in Worcester 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 Lake Quinsigamond?
- Lake Quinsigamond in Worcester County, Massachusetts is not rated for water quality — its monitoring record does not meet the evidence bar. Chlorophyll-a (algae): 2.5 µg/L. Surface area: 1.5 acres.
Is Lake Quinsigamond safe to swim in?
- The letter is not a swimming clearance. Lake Quinsigamond is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, noxious aquatic plants, nuisance exotic species, oxygen depletion (low DO), pathogens (E. coli, fecal). Check local advisories before you swim.
How deep is Lake Quinsigamond?
- No published bathymetric survey covers Lake Quinsigamond, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 37 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 1.5 acres.
Explore Lake Quinsigamond across LakeQuality
Depth, room, public access, and the state wake-sport rules
Species activity outlook by water temperature and season
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Where this data comes from
1 measurement from 1 monitoring station, 2018. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Massachusetts Department of Environmental Protection (MassDEP)
MASSDEP1 sample · 2018
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)