Mashipacong Pond
Mashipacong Pond in Sussex County, New Jersey has a water quality grade of A (Excellent). Water clarity: 9.7 ft visibility. Phosphorus: 10.8 µg/L. Chlorophyll-a (algae): 5.2 µg/L. Surface area: 50 acres.
- Clarity
- 9.7 ft
- Area
- 50 acres
- Type
- Mesotrophic
Mashipacong Pond is a 50-acre mesotrophic lake in Sussex County, New Jersey. Water quality is graded A based on 2 sampling years through 2024. Compared to the 17 other monitored lakes in Sussex County, Mashipacong Pond ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2024-08-06. 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.
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A (Excellent)
Moderate clarity, visible to about 9.7 ft. Phosphorus level: 10.8 µg/L. Chlorophyll-a: 5.2 µg/L. Trophic State Index: 43.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 9.7 ft | Not graded |
| Phosphorus | 10.8 µg/L | Good |
| Chlorophyll-a (Algae) | 5.2 µg/L | Good |
| Trophic State Index (TSI) | 43 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Mashipacong Pond
Compare lakeside cabins, hotels, and vacation rentals near Mashipacong Pond 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.
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 50 acres |
No bathymetric survey has been published for Mashipacong Pond, so its depth is not documented here.
Fishing Mashipacong Pond
Reservoir Info (USACE NID)
Mashipacong Pond is a man-made reservoir impounded by the Mashipacong Pond Dam, built primarily for recreation on the Parker Brook; earth-type dam, 12 ft tall and 300 ft long.
- Surface area
- 50 ac
- Normal storage
- 210 ac-ft
- Drainage area
- 0.7 sq mi
- Hazard class
- Low
- Owner
- The Nature Conservancy
Source: USACE National Inventory of Dams, NID ID NJ00494 · Operator website
EPA Impairment Status
Mashipacong Pond 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 NJ02040104140020-01 · Official waterbody report · Matched by proximity (0.6 km)
County Ranking
Ranked #2 of 18 lakes in Sussex County
Nearby Lakes in Sussex County
Frequently asked questions about Mashipacong Pond
Where is Mashipacong Pond?
- Mashipacong Pond is a lake in Sussex County, New Jersey. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Mashipacong Pond?
- Mashipacong Pond in Sussex County, New Jersey has a water quality grade of A (Excellent). Water clarity: 9.7 ft visibility. Phosphorus: 10.8 µg/L. Chlorophyll-a (algae): 5.2 µg/L. Surface area: 50 acres.
Is Mashipacong Pond safe to swim in?
- Excellent for swimming, crystal clear water with minimal algae. Mashipacong Pond has a water quality grade of A (Excellent). Algae concentration (chlorophyll-a) is 5.2 µg/L. Always check local health department advisories before swimming.
Explore Mashipacong Pond across LakeGrade
More New Jersey Lake Rankings
Other Grade A Lakes in New Jersey
Mesotrophic Lakes in New Jersey
Where this data comes from
25 measurements from 1 monitoring station, 2021–2024. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- NJDEP Bureau of Freshwater and Biological Monitoring
NJDEP_BFBM25 samples · 2021–2024
Analytical methods
- Phosphorus by Colorimetry
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
- 2120 B ~ Color in Water by Visual Comparison
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
Impairment status from EPA ATTAINS 303(d) database