Sussex County Lake Quality

New Jersey, 22 lakes, average grade C (Fair)

Sussex County's 22 graded lakes fall in the moderate-density bracket for New Jersey. The county-level average smooths over real differences — a single agricultural watershed near the southwest corner can pull the average down even if the rest of the county runs clean. The county average is C — the middle of the rubric, with one or two lakes pulling the average up or down depending on year.

The county's lakes lean shallow, which makes the grades sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest lake on the books is Great Gorge Lake (A); the most-stressed is Boardwalk Lake (D).

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Quick Answers for Sussex County

Cleanest lakes in Sussex County →Cleanest lakes in New Jersey →Safest swimming lakes in New Jersey →

Planning a trip? Check special fishing regulations for Great Gorge Lake — or check the official New Jersey fishing regulations.

All Lakes in Sussex County

22 lakes · 16 graded, 6 not rated16 graded lakes · 6 not rated, hidden

Include not-rated lakes (6)

#	Lake	Grade	Clarity	Phosphorus	Algae	Trophic	Access
1	AGreat Gorge LakeSussex	A	12.3 ft	11.1 µg/L	3.7 µg/L	No recent samples	Not recorded
2	AMashipacong PondSussex	A	9.7 ft	10.8 µg/L	5.2 µg/L	No recent samples	Not recorded
3	CLake OcquittunkSussex	C	4.1 ft	23.2 µg/L	13 µg/L	No recent samples	Not recorded
4	CLake TranquilitySussex	C	8.5 ft	15.2 µg/L	6.4 µg/L	No recent samples	Not recorded
5	DBoardwalk LakeSussex	D	5.2 ft	40 µg/L	No recent samples	No recent samples	Not recorded
6	DCollins PondSussex	D	6.1 ft	17.6 µg/L	13.1 µg/L	No recent samples	Not recorded
7	DCranberry LakeSussex	D	8.2 ft	21.5 µg/L	9.3 µg/L	No recent samples	Not recorded
8	DLake KemahSussex	D	5.4 ft	20 µg/L	22.1 µg/L	No recent samples	Not recorded
9	DReynolds LakeSussex	D	3.9 ft	33.8 µg/L	15.4 µg/L	No recent samples	Not recorded
10	DSilver LakeSussex	D	3.9 ft	34.4 µg/L	18.8 µg/L	No recent samples	Not recorded
11	DSouth End LakeSussex	D	4.4 ft	30 µg/L	No recent samples	No recent samples	Not recorded
12	DTamarack Cove LakeSussex	D	5.2 ft	30 µg/L	No recent samples	No recent samples	Not recorded
13	DThree-Finger Cove LakeSussex	D	3.9 ft	40 µg/L	No recent samples	No recent samples	Not recorded
14	DTurtle Cove LakeSussex	D	4.6 ft	30 µg/L	No recent samples	No recent samples	Not recorded
15	DUnl LakeSussex	D	3.3 ft	43.1 µg/L	12.9 µg/L	No recent samples	Not recorded
16	DWatchu PondSussex	D	5.6 ft	29.5 µg/L	16.6 µg/L	No recent samples	Not recorded
	NRControl For Greenclean LakeSussex	NR	3.9 ft	No recent samples	No recent samples	No recent samples	Not recorded
	NRHopatcong A LakeSussex	NR	4.3 ft	No recent samples	No recent samples	No recent samples	Not recorded
	NRManitou Cove LakeSussex	NR	3.9 ft	No recent samples	No recent samples	No recent samples	Not recorded
	NRQuick PondSussex	NR	6.6 ft	10 µg/L	25.9 µg/L	No recent samples	Not recorded
	NRTamarack LakeSussex	NR	5.7 ft	No recent samples	No recent samples	No recent samples	Not recorded
	NRTreatment For Greenclean LakeSussex	NR	3.9 ft	No recent samples	No recent samples	No recent samples	Not recorded

NR = not rated: the monitoring record does not meet the evidence bar for a grade. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.

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