Crystal Lake
Crystal Lake in Litchfield County, Connecticut has a water quality grade of B (Good). Phosphorus: 9 µg/L. Chlorophyll-a (algae): 1.4 µg/L. Surface area: 145 acres.
- Area
- 145 acres
- Type
- Oligotrophic
Crystal Lake is a 145-acre cold, clear oligotrophic lake in Litchfield County, Connecticut. Water quality is graded B based on 2 sampling years through 2022. Compared to the 11 other monitored lakes in Litchfield County, Crystal Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2022-07-26. Grade methodology: LakeGrade methodology.
Watch Crystal 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: 9 µg/L. Chlorophyll-a: 1.4 µg/L. Trophic State Index: 35.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 9 µg/L | Good |
| Chlorophyll-a (Algae) | 1.4 µg/L | Not graded |
| Trophic State Index (TSI) | 35 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Crystal Lake
Compare lakeside cabins, hotels, and vacation rentals near Crystal Lake in Litchfield 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 Crystal 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 | 145 acres |
No bathymetric survey has been published for Crystal Lake, so its depth is not documented here.
Fishing Crystal Lake
Reservoir Info (USACE NID)
Crystal Lake is a man-made reservoir impounded by the Crystal Lake Reservoir Dam (completed 1892), built primarily for water supply on the Sucker Brook; earth-type dam, 13 ft tall and 520 ft long.
- Surface area
- 145 ac
- Normal storage
- 1,680 ac-ft
- Max storage
- 1,680 ac-ft
- Drainage area
- 1.1 sq mi
- Hazard class
- Significant
- Owner
- Town of Winchester
Source: USACE National Inventory of Dams, NID ID CT00104 · Operator website
County Ranking
Ranked #1 of 12 lakes in Litchfield County
Nearby Lakes in Litchfield County
Frequently asked questions about Crystal Lake
Where is Crystal Lake?
- Crystal Lake is a lake in Litchfield County, Connecticut. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Crystal Lake?
- Crystal Lake in Litchfield County, Connecticut has a water quality grade of B (Good). Phosphorus: 9 µg/L. Chlorophyll-a (algae): 1.4 µg/L. Surface area: 145 acres.
Is Crystal Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Crystal Lake has a water quality grade of B (Good). Algae concentration (chlorophyll-a) is 1.4 µg/L. Always check local health department advisories before swimming.
Explore Crystal 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.