Beseck Lake
Middlesex County, Connecticut116 acresView mapDirections
CT DEEP publishes the water-quality measurements for Beseck Lake. Here is what has been measured.
- Impaired · Algal growth
- Limited data
Beseck Lake in Middlesex County, Connecticut has water-quality measurements published by CT DEEP, shown here as reported. Water clarity: 4.1 ft visibility. Surface area: 116 acres.
Beseck Lake is a 116-acre lake in Middlesex County, Connecticut.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2022-10-06. Methodology: how these readings are compared.
Swimming conditions
No readingRecreation use not supported
Nutrient and algae readings are not a swimming clearance. Beseck Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Whether Beseck Lake is safe to swim in today is a call for the Connecticut Department of Energy and Environmental Protection and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Beseck Lake
These are the measurements CT DEEP publishes for Beseck Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 4.1 ft. TSI 57.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 4.1ft | Measured, not scored 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) | No reading 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. | 57 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Beseck Lake
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Lake Details
Surface area
116 acres
No bathymetric survey has been published for Beseck Lake, so its depth is not documented here.
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Fishing Beseck Lake
Reservoir Info (USACE NID)
Beseck Lake is a man-made reservoir impounded by the Lake Beseck Dam (completed 1846), built primarily for recreation on the Ellen Doyle Brook; masonry-type dam, 34 ft tall and 300 ft long.
- Surface area
- 116 ac
- Normal storage
- 1,256 ac-ft
- Max storage
- 2,089 ac-ft
- Drainage area
- 2.05 sq mi
- Hazard class
- Significant
- Owner
- Connecticut DEEP
Source: USACE National Inventory of Dams, NID ID CT00381 · Operator website
EPA Impairment Status
Beseck Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Aquatic life, Recreation.
Source: EPA ATTAINS assessment unit CT4607-10-1-L1_01 · Official waterbody report
Nearby Lakes in Middlesex County
Frequently asked questions about Beseck Lake
Where is Beseck Lake?
- Beseck Lake is a lake in Middlesex County, Connecticut. Its water-quality measurements are published by CT DEEP and shown on this page as reported.
What is the water quality of Beseck Lake?
- Beseck Lake in Middlesex County, Connecticut has water-quality measurements published by CT DEEP, shown here as reported. Water clarity: 4.1 ft visibility. Surface area: 116 acres.
Is Beseck Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Beseck Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, nutrients (phosphorus, nitrogen). Check local advisories before you swim.
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Where this data comes from
44 measurements from 3 monitoring stations, 2021–2022. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- North American Lake Management Society
NALMS30 samples · 2021–2022 - CT DEEP Volunteer Water Monitoring Program (Volunteer)
CTVOLMON14 samples · 2022
Monitoring station identifiers (3)
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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database