Lake Tranquility
Lake Tranquility in Sussex County, New Jersey has a water quality grade of C (Fair). Water clarity: 8.5 ft visibility. Phosphorus: 15.2 µg/L. Chlorophyll-a (algae): 6.4 µg/L. Surface area: 51 acres.
- Clarity
- 8.5 ft
- Area
- 51 acres
- Type
- Mesotrophic
Lake Tranquility is a 51-acre mesotrophic lake in Sussex County, New Jersey. Water quality is graded C based on 2 sampling years through 2024. Compared to the 17 other monitored lakes in Sussex County, Lake Tranquility ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2024-11-19. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyBacteria advisory
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.
Generally safe for swimming, moderate water quality
Water Quality Grade: C (Fair)
Moderate clarity, visible to about 8.5 ft. Phosphorus level: 15.2 µg/L. Chlorophyll-a: 6.4 µg/L. Trophic State Index: 46.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 8.5 ft | Not graded |
| Phosphorus | 15.2 µg/L | Good |
| Chlorophyll-a (Algae) | 6.4 µg/L | Fair |
| Trophic State Index (TSI) | 46 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Lake Tranquility
Compare lakeside cabins, hotels, and vacation rentals near Lake Tranquility in Sussex County, New Jersey — 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 Lake Tranquility
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 51 acres |
No bathymetric survey has been published for Lake Tranquility, so its depth is not documented here.
Fishing Lake Tranquility
Reservoir Info (USACE NID)
Lake Tranquility is a man-made reservoir impounded by the Lake Tranquility Dam (completed 1932), built primarily for recreation on the Trout Brook; earth-type dam, 14 ft tall and 170 ft long.
- Surface area
- 51 ac
- Normal storage
- 495 ac-ft
- Drainage area
- 3 sq mi
- Hazard class
- High
- Owner
- Township of Green
Source: USACE National Inventory of Dams, NID ID NJ00275 · Operator website
EPA Impairment Status
Lake Tranquility is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit NJ02040105070040-01 · Official waterbody report · Matched by proximity (1.24 km)
County Ranking
Ranked #4 of 18 lakes in Sussex County
Nearby Lakes in Sussex County
Frequently asked questions about Lake Tranquility
Where is Lake Tranquility?
- Lake Tranquility is a lake in Sussex County, New Jersey. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Lake Tranquility?
- Lake Tranquility in Sussex County, New Jersey has a water quality grade of C (Fair). Water clarity: 8.5 ft visibility. Phosphorus: 15.2 µg/L. Chlorophyll-a (algae): 6.4 µg/L. Surface area: 51 acres.
Is Lake Tranquility safe to swim in?
- Generally safe for swimming, moderate water quality. Lake Tranquility has a water quality grade of C (Fair). Algae concentration (chlorophyll-a) is 6.4 µg/L. Always check local health department advisories before swimming.
Explore Lake Tranquility across LakeGrade
More New Jersey Lake Rankings
Other Grade C Lakes in New Jersey
Mesotrophic Lakes in New Jersey
Where this data comes from
50 measurements from 2 monitoring stations, 2023–2024. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- NJDEP Bureau of Freshwater and Biological Monitoring
NJDEP_BFBM50 samples · 2023–2024
Analytical methods
- Phosphorus by Colorimetry
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
Monitoring station identifiers (2)
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
Impairment status from EPA ATTAINS 303(d) database