Saugatuck Reservoir
Saugatuck Reservoir in Fairfield County, Connecticut has a water quality grade of B (Good). Phosphorus: 10 µg/L. Chlorophyll-a (algae): 5.9 µg/L. Surface area: 868 acres.
- Area
- 868 acres
- Type
- Mesotrophic
Saugatuck Reservoir is a 868-acre mesotrophic lake in Fairfield County, Connecticut. Water quality is graded B based on 2 sampling years through 2023. Compared to the 3 other monitored lakes in Fairfield County, Saugatuck Reservoir ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2023-09-12. 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: 10 µg/L. Chlorophyll-a: 5.9 µg/L. Trophic State Index: 43.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 10 µg/L | Good |
| Chlorophyll-a (Algae) | 5.9 µg/L | Not graded |
| Trophic State Index (TSI) | 43 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Saugatuck Reservoir
Compare lakeside cabins, hotels, and vacation rentals near Saugatuck Reservoir in Fairfield 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 Saugatuck Reservoir
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 868 acres |
No bathymetric survey has been published for Saugatuck Reservoir, so its depth is not documented here.
Fishing Saugatuck Reservoir
Reservoir Info (USACE NID)
Saugatuck Reservoir is a man-made reservoir impounded by the Samuel P. Senior Dam (completed 1941), built primarily for water supply on the Saugatuck River; concrete-type dam, 130 ft tall and 990 ft long.
- Surface area
- 868 ac
- Normal storage
- 36,800 ac-ft
- Max storage
- 42,000 ac-ft
- Drainage area
- 34.6 sq mi
- Hazard class
- High
- Owner
- Aquarion Water Company of Connecticut
Source: USACE National Inventory of Dams, NID ID CT00108 · Operator website
County Ranking
Ranked #1 of 4 lakes in Fairfield County
Nearby Lakes in Fairfield County
Frequently asked questions about Saugatuck Reservoir
Where is Saugatuck Reservoir?
- Saugatuck Reservoir is a lake in Fairfield County, Connecticut. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Saugatuck Reservoir?
- Saugatuck Reservoir in Fairfield County, Connecticut has a water quality grade of B (Good). Phosphorus: 10 µg/L. Chlorophyll-a (algae): 5.9 µg/L. Surface area: 868 acres.
Is Saugatuck Reservoir safe to swim in?
- Good for swimming, clear water with low algae levels. Saugatuck Reservoir has a water quality grade of B (Good). Algae concentration (chlorophyll-a) is 5.9 µg/L. Always check local health department advisories before swimming.
Explore Saugatuck Reservoir across LakeGrade
More Connecticut Lake Rankings
Other Grade B Lakes in Connecticut
Mesotrophic 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.