Billerica Impoundment Lake
Middlesex County, Massachusetts9 acresView mapDirections
MassDEP publishes the water-quality measurements for Billerica Impoundment Lake. Here is what has been measured.
- Limited data
Billerica Impoundment Lake in Middlesex County, Massachusetts has water-quality measurements published by MassDEP, shown here as reported. Chlorophyll-a (algae): 68.6 µg/L. Surface area: 8.6 acres.
Billerica Impoundment Lake is a 9-acre lake in Middlesex County, Massachusetts.
Source: EPA Water Quality Portal sampling records, MassDEP, last sampled 2012-08-20. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Billerica Impoundment Lake is safe to swim in today is a call for the Massachusetts Department of Environmental Protection and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Billerica Impoundment Lake
These are the measurements MassDEP publishes for Billerica Impoundment Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Chlorophyll-a 68.6 µg/L. TSI 72.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | 68.6µg/L | Measured, not scored The green pigment in algae — a direct measure of how much algae is in the water. |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 72 | Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Very high nutrients, dense algae, poor clarity
Ask about Billerica Impoundment Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
9 acres
No bathymetric survey has been published for Billerica Impoundment Lake, so its depth is not documented here.
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Fishing Billerica Impoundment Lake
Reservoir Info (USACE NID)
Billerica Impoundment Lake is a man-made reservoir impounded by the Talbot Mills Dam (completed 1828), built primarily for flood risk reduction on the Concord River; masonry-type dam, 16 ft tall and 316 ft long.
- Surface area
- 8.6 ac
- Normal storage
- 110 ac-ft
- Max storage
- 162 ac-ft
- Drainage area
- 370 sq mi
- Hazard class
- Significant
- Owner
- CRT Development Realty, LLC
All listed purposes: Flood Risk Reduction;Recreation.
Source: USACE National Inventory of Dams, NID ID MA00774 · Operator website · Matched by proximity (0.09 km)
Nearby Lakes in Middlesex County
Frequently asked questions about Billerica Impoundment Lake
Where is Billerica Impoundment Lake?
- Billerica Impoundment Lake is a lake in Middlesex County, Massachusetts. Its water-quality measurements are published by MassDEP and shown on this page as reported.
What is the water quality of Billerica Impoundment Lake?
- Billerica Impoundment Lake in Middlesex County, Massachusetts has water-quality measurements published by MassDEP, shown here as reported. Chlorophyll-a (algae): 68.6 µg/L. Surface area: 8.6 acres.
Is Billerica Impoundment Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
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Where this data comes from
1 measurement from 1 monitoring station, 2012. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- OARS - For the Assabet Sudbury & Concord Rivers (Volunteer)
OARS1 sample · 2012
Analytical methods
- 10200 H ~ Chlorophyll a-b-c Determination
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.