Bashan Lake
Bashan Lake in Middlesex County, Connecticut has a water quality grade of B (Good). Phosphorus: 15 µg/L. Chlorophyll-a (algae): 1.5 µg/L. Surface area: 267 acres.
- Area
- 267 acres
- Type
- Oligotrophic
- Public access
- Yes
Bashan Lake is a 267-acre cold, clear oligotrophic lake in Middlesex County, Connecticut. Water quality is graded B based on 2 sampling years through 2022. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 4 other monitored lakes in Middlesex County, Bashan Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2022-08-25. Grade methodology: LakeGrade methodology.
Watch Bashan Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
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.
Good for swimming, clear water with low algae levels
Water Quality Grade: B (Good)
No clarity data. Phosphorus level: 15 µg/L. Chlorophyll-a: 1.5 µg/L. Trophic State Index: 39.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 15 µg/L | Good |
| Chlorophyll-a (Algae) | 1.5 µg/L | Not graded |
| Trophic State Index (TSI) | 39 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Bashan Lake
Compare lakeside cabins, hotels, and vacation rentals near Bashan Lake in Middlesex County, Connecticut — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Bashan Lake
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 267 acres |
| Public Access | Yes |
No bathymetric survey has been published for Bashan Lake, so its depth is not documented here.
Recreation & Access
- Bashan LakePublic
Named access points from the USGS National Boat Ramps inventory, snapped within 5 km. More lakes with boat ramps
Fishing Bashan Lake
Reservoir Info (USACE NID)
Bashan Lake is a man-made reservoir impounded by the Bashan Lake Dam (completed 1939), built primarily for recreation on the Moodus River; earth-type dam, 24 ft tall and 170 ft long.
- Surface area
- 267 ac
- Normal storage
- 4,555 ac-ft
- Max storage
- 4,890 ac-ft
- Drainage area
- 1.94 sq mi
- Hazard class
- Significant
- Owner
- Connecticut DEEP
Source: USACE National Inventory of Dams, NID ID CT00354 · Operator website
County Ranking
Ranked #2 of 5 lakes in Middlesex County
Nearby Lakes in Middlesex County
Frequently asked questions about Bashan Lake
Where is Bashan Lake?
- Bashan Lake is a lake in Middlesex County, Connecticut. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Bashan Lake?
- Bashan Lake in Middlesex County, Connecticut has a water quality grade of B (Good). Phosphorus: 15 µg/L. Chlorophyll-a (algae): 1.5 µg/L. Surface area: 267 acres.
Is Bashan Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Bashan Lake has a water quality grade of B (Good). Algae concentration (chlorophyll-a) is 1.5 µg/L. Always check local health department advisories before swimming.
Are there boat ramps on Bashan Lake?
- Bashan Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Bashan Lake. Public access is listed as yes.
Explore Bashan Lake across LakeGrade
More Connecticut Lake Rankings
Other Grade B Lakes in Connecticut
Oligotrophic Lakes in Connecticut
Where this data comes from
10 measurements from 1 monitoring station, 2022. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- Connecticut Department Of Energy And Environmental Protection
CT_DEP01_WQX10 samples · 2022
Analytical methods
- Total Phosphorus After Block Digestion
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
- Nitrate-Nitrite Nitrogen by Colorimetry
- Turbidity by Nephelometry
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
Named boat-access points from the USGS National Boat Ramps inventory