Crystal Lake
Crystal Lake in Tolland County, Connecticut has a water quality grade of B (Good). Phosphorus: 13 µg/L. Chlorophyll-a (algae): 2.1 µg/L. Surface area: 178 acres.
- Area
- 178 acres
- Type
- Oligotrophic
- Public access
- Yes
Crystal Lake is a 178-acre cold, clear oligotrophic lake in Tolland County, Connecticut. Water quality is graded B based on 2 sampling years through 2023. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 3 other monitored lakes in Tolland County, Crystal Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2023-06-22. Grade methodology: LakeGrade methodology.
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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: 13 µg/L. Chlorophyll-a: 2.1 µg/L. Trophic State Index: 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 13 µg/L | Good |
| Chlorophyll-a (Algae) | 2.1 µg/L | Not graded |
| Trophic State Index (TSI) | 40 | 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 Tolland 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
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 178 acres |
| Public Access | Yes |
No bathymetric survey has been published for Crystal Lake, so its depth is not documented here.
Recreation & Access
- Crystal LakePublic
Named access points from the USGS National Boat Ramps inventory, snapped within 5 km. More lakes with boat ramps
Fishing Crystal Lake
Reservoir Info (USACE NID)
Crystal Lake is a man-made reservoir impounded by the Crystal Lake Dam (completed 1900), built primarily for recreation on the Crystal Lake Brook; earth-type dam, 11 ft tall and 250 ft long.
- Surface area
- 178 ac
- Normal storage
- 1,450 ac-ft
- Max storage
- 1,450 ac-ft
- Drainage area
- 2.78 sq mi
- Hazard class
- Significant
- Owner
- Roberson
Source: USACE National Inventory of Dams, NID ID CT00341 · Operator website
County Ranking
Ranked #2 of 4 lakes in Tolland County
Nearby Lakes in Tolland County
Frequently asked questions about Crystal Lake
Where is Crystal Lake?
- Crystal Lake is a lake in Tolland 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 Tolland County, Connecticut has a water quality grade of B (Good). Phosphorus: 13 µg/L. Chlorophyll-a (algae): 2.1 µg/L. Surface area: 178 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 2.1 µg/L. Always check local health department advisories before swimming.
Are there boat ramps on Crystal Lake?
- Crystal Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Crystal Lake. Public access is listed as yes.
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, 2023. 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 · 2023
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