Tamarack Lake
Sussex County, New Jersey777 acresView mapDirections
NJDEP publishes the water-quality measurements for Tamarack Lake. Here is what has been measured.
- Impaired · Impaired biota (cause unknown)
- Limited data
Tamarack Lake in Sussex County, New Jersey has water-quality measurements published by NJDEP, shown here as reported. Water clarity: 5.7 ft visibility. Surface area: 777 acres.
Tamarack Lake is a 777-acre lake in Sussex County, New Jersey.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2020-07-23. Methodology: how these readings are compared.
Swimming conditions
No readingBacteria advisory
Nutrient and algae readings are not a swimming clearance. Tamarack Lake is listed impaired under Clean Water Act §303(d) (IR 5) for impaired biota (cause unknown), metals (other than mercury), pathogens (E. coli, fecal), temperature. Check local advisories before you swim.
Whether Tamarack Lake is safe to swim in today is a call for the New Jersey Department of Environmental Protection and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Tamarack Lake
These are the measurements NJDEP publishes for Tamarack Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 5.7 ft. TSI 52.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 5.7ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 52 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Tamarack Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
777 acres
No bathymetric survey has been published for Tamarack Lake, so its depth is not documented here.
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Fishing Tamarack Lake
Reservoir Info (USACE NID)
Tamarack Lake is a man-made reservoir impounded by the Lake Mohawk Dam (completed 1927), built primarily for recreation on the Wallkill River; earth-type dam, 20 ft tall and 580 ft long.
- Surface area
- 777 ac
- Normal storage
- 8,220 ac-ft
- Max storage
- 14,220 ac-ft
- Drainage area
- 4.3 sq mi
- Hazard class
- High
- Owner
- Lake Mohawk Country Club
Source: USACE National Inventory of Dams, NID ID NJ00017 · Operator website · Matched by proximity (0.66 km)
EPA Impairment Status
Tamarack Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Drinking water, Aquatic life, Recreation.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NJ02020007010010-01 · Official waterbody report
Nearby Lakes in Sussex County
Frequently asked questions about Tamarack Lake
Where is Tamarack Lake?
- Tamarack Lake is a lake in Sussex County, New Jersey. Its water-quality measurements are published by NJDEP and shown on this page as reported.
What is the water quality of Tamarack Lake?
- Tamarack Lake in Sussex County, New Jersey has water-quality measurements published by NJDEP, shown here as reported. Water clarity: 5.7 ft visibility. Surface area: 777 acres.
Is Tamarack Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Tamarack Lake is listed impaired under Clean Water Act §303(d) (IR 5) for impaired biota (cause unknown), metals (other than mercury), pathogens (E. coli, fecal), temperature. Check local advisories before you swim.
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Where this data comes from
4 measurements from 2 monitoring stations, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- Princeton Hydro LLC
PRINCETONHYDRO4 samples · 2020
Monitoring station identifiers (2)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database