Winnebago Lake
Winnebago Lake in Morris County, New Jersey has a water quality grade of D (Nutrient-rich). Water clarity: 3.8 ft visibility. Phosphorus: 50.9 µg/L. Chlorophyll-a (algae): 26.3 µg/L.
- Clarity
- 3.8 ft
- Type
- Eutrophic
Grade D measures nutrients and algae, not whether this is a good place for a cabin trip. Cabins and rentals near Winnebago Lake →
Winnebago Lake is a productive, nutrient-rich eutrophic lake in Morris County, New Jersey. Water quality is graded D based on 2 sampling years through 2024. Compared to the 11 other monitored lakes in Morris County, Winnebago Lake ranks #7 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2024-11-26. 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.
Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum
Water Quality Grade: D (Nutrient-rich)
Murky, only visible to about 3.8 ft. Phosphorus level: 50.9 µg/L. Chlorophyll-a: 26.3 µg/L. Trophic State Index: 60.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.8 ft | Not graded |
| Phosphorus | 50.9 µg/L | Poor |
| Chlorophyll-a (Algae) | 26.3 µg/L | Poor |
| Trophic State Index (TSI) | 60 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Winnebago Lake
Compare lakeside cabins, hotels, and vacation rentals near Winnebago Lake in Morris 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. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Winnebago Lake are listed below.
Top-rated places to stay near Winnebago Lake
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Fishing Winnebago Lake
County Ranking
Ranked #7 of 12 lakes in Morris County
Nearby Lakes in Morris County
Frequently asked questions about Winnebago Lake
Where is Winnebago Lake?
- Winnebago Lake is a lake in Morris County, New Jersey. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Winnebago Lake?
- Winnebago Lake in Morris County, New Jersey has a water quality grade of D (Nutrient-rich). Water clarity: 3.8 ft visibility. Phosphorus: 50.9 µg/L. Chlorophyll-a (algae): 26.3 µg/L.
Is Winnebago Lake safe to swim in?
- Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum. Winnebago Lake has a water quality grade of D (Nutrient-rich). Algae concentration (chlorophyll-a) is 26.3 µg/L. Always check local health department advisories before swimming.
Explore Winnebago Lake across LakeGrade
More New Jersey Lake Rankings
Other Grade D Lakes in New Jersey
Eutrophic Lakes in New Jersey
Where this data comes from
26 measurements from 1 monitoring station, 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_BFBM26 samples · 2023–2024
Analytical methods
- Phosphorus by Colorimetry
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
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.