8 lakes tracked ·
8 with a current elevation reading ·
USGS Water Services + USACE CWMS Data
New Jersey has 8 lakes and reservoirs tracked here — 8 with a current elevation reading, from USGS Water Services and USACE CWMS Data. Sort the table by level, storage, %-full, or trend, then open any lake for its full elevation-with-datum, trend sparkline, storage, and source-and-vintage stamp. Figures are provisional readings for reference — not for navigation or safety decisions.
Statewide totalsNew Jersey · USGS + USACE
Lakes tracked
8
8 report a current pool-elevation reading; the rest report storage only.
With elevation reading
8
With %-full figure
0
All New Jersey lakes
Every lake tracked in New Jersey. Click a column heading to sort, or filter by name. Elevation lakes
are listed before storage-only lakes; a missing figure always shows "not reported," never an estimate.
Data: USGS Water Services (waterservices.usgs.gov) and USACE CWMS Data (cwms-data.usace.army.mil), retrieved 2026-08-31. Both public domain (a work of the U.S. Government, 17 U.S.C. §105).
Every New Jersey lake in detail
Each lake tracked in New Jersey has its full record here — current reading, recent
trend, and the dam behind it where the National Inventory of Dams has one. Use the table above
to jump to a lake, or read straight through.
Boonton Reservoir at Boonton
USGS · reading Aug 31, 2026, 4:00 AM (UTC-04:00) Provisional
Pool elevation
305.45 ft
Datum NGVD29
% of conservation pool full
Not reported
Storage
Not reported
Recent trend
→Steady
0.0 ft over the trend window
Boonton Reservoir at Boonton is held back by Boonton Dam , a masonry structure of cut stone or block , standing 120 ft high and running 2,150 ft along its crest , built across Rockaway River in Morris County . It was completed in 1905 , and is owned by Jersey City Municipal Utilities Authority .
Its recorded primary purpose is water supply — delivering water to its customers comes first, so drawdown here follows demand as much as it follows rainfall. NID classes it high hazard potential. That describes what a failure would cost downstream — loss of life would be expected — and says nothing about how likely a failure is, or what condition the dam is in. Its most recent condition assessment was satisfactory — no deficiencies recognised for expected loading. National Inventory of Dams record NJ00354 — U.S. Army Corps of Engineers, public domain.
USGS · reading Aug 31, 2026, 3:15 AM (UTC-04:00) Provisional
Pool elevation
618.45 ft
Datum NAVD88
% of conservation pool full
Not reported
Storage
Not reported
Recent trend
↓Falling
−0.2 ft over the trend window
Greenwood Lake at Awosting is held back by Greenwood Lake Dam , a concrete structure , standing 17 ft high and running 270 ft along its crest , built across Wanaque River in Passaic County , near Netcong . It was completed in 1928 , and is owned by Division of Parks and Forestry .
Its recorded primary purpose is recreation — holding a stable pool through the season is an operating goal, so a level well off normal in summer is unusual rather than routine. NID classes it high hazard potential. That describes what a failure would cost downstream — loss of life would be expected — and says nothing about how likely a failure is, or what condition the dam is in. Its most recent condition assessment was poor — a deficiency was recognised that needs attention. National Inventory of Dams record NJ00187 — U.S. Army Corps of Engineers, public domain.
USGS · reading Aug 31, 2026, 3:30 AM (UTC-04:00) Provisional
Pool elevation
55.10 ft
Datum NGVD29
% of conservation pool full
Not reported
Storage
Not reported
Recent trend
→Steady
−0.1 ft over the trend window
Lake Tappan at Old Tappan is held back by Lake Tappan Dam , an earthfill embankment, holding the pool back by sheer mass and an impervious core rather than by the strength of concrete , standing 34 ft high and running 590 ft along its crest , built across Hackensack River in Bergen County , near Old Tappan . It was completed in 1966 , and is owned by SUEZ Water New Jersey, Inc. .
Its recorded primary purpose is water supply — delivering water to its customers comes first, so drawdown here follows demand as much as it follows rainfall. NID classes it high hazard potential. That describes what a failure would cost downstream — loss of life would be expected — and says nothing about how likely a failure is, or what condition the dam is in. Its most recent condition assessment was satisfactory — no deficiencies recognised for expected loading. National Inventory of Dams record NJ00246 — U.S. Army Corps of Engineers, public domain.
USGS · reading Aug 31, 2026, 3:15 AM (UTC-04:00) Provisional
Pool elevation
23.04 ft
Datum NGVD29
% of conservation pool full
Not reported
Storage
Not reported
Recent trend
↓Falling
−0.2 ft over the trend window
Oradell Reservoir at Oradell is held back by Oradell Reservoir Dam , an earthfill embankment, holding the pool back by sheer mass and an impervious core rather than by the strength of concrete , standing 25 ft high and running 402 ft along its crest , built across Hackensack River in Bergen County , near New Milford . It was completed in 1922 , and is owned by SUEZ Water New Jersey, Inc. .
Its recorded primary purpose is water supply — delivering water to its customers comes first, so drawdown here follows demand as much as it follows rainfall. NID classes it high hazard potential. That describes what a failure would cost downstream — loss of life would be expected — and says nothing about how likely a failure is, or what condition the dam is in. Its most recent condition assessment was fair: sound under normal loading, though a rare or extreme event could expose a deficiency. National Inventory of Dams record NJ00258 — U.S. Army Corps of Engineers, public domain.
USGS · reading Aug 31, 2026, 3:45 AM (UTC-04:00) Provisional
Pool elevation
262.70 ft
Datum NGVD29
% of conservation pool full
Not reported
Storage
Not reported
Recent trend
↑Rising
+1.3 ft over the trend window
Spruce Run Reservoir at Clinton is held back by Spruce Run Reservoir Dam , an earthfill embankment, holding the pool back by sheer mass and an impervious core rather than by the strength of concrete , standing 93 ft high and running 5,400 ft along its crest , built across Spruce Run in Hunterdon County , near Clinton . It was completed in 1964 , and is owned by New Jersey Water Supply Authority .
Its recorded primary purpose is water supply — delivering water to its customers comes first, so drawdown here follows demand as much as it follows rainfall. NID classes it high hazard potential. That describes what a failure would cost downstream — loss of life would be expected — and says nothing about how likely a failure is, or what condition the dam is in. Its most recent condition assessment was poor — a deficiency was recognised that needs attention. National Inventory of Dams record NJ00132 — U.S. Army Corps of Engineers, public domain.
USGS · reading Aug 31, 2026, 3:15 AM (UTC-04:00) Provisional
Pool elevation
35.06 ft
Datum NGVD29
% of conservation pool full
Not reported
Storage
Not reported
Recent trend
↑Rising
+2.8 ft over the trend window
Swimming River Reservoir is held back by Swimming River Reservoir Dam , an earthfill embankment, holding the pool back by sheer mass and an impervious core rather than by the strength of concrete , standing 45 ft high and running 2,400 ft along its crest , built across Robins Swamp Brook in Monmouth County , near Red Bank . It was completed in 1901 , and is owned by New Jersey-American Water Company .
Its recorded primary purpose is water supply — delivering water to its customers comes first, so drawdown here follows demand as much as it follows rainfall. NID classes it high hazard potential. That describes what a failure would cost downstream — loss of life would be expected — and says nothing about how likely a failure is, or what condition the dam is in. Its most recent condition assessment was satisfactory — no deficiencies recognised for expected loading. National Inventory of Dams record NJ00082 — U.S. Army Corps of Engineers, public domain.
USGS · reading Aug 31, 2026, 3:15 AM (UTC-04:00) Provisional
Pool elevation
295.64 ft
Datum NGVD29
% of conservation pool full
Not reported
Storage
Not reported
Recent trend
↑Rising
+1.6 ft over the trend window
Wanaque Reservoir at Wanaque is held back by Raymond Dam , an earthfill embankment, holding the pool back by sheer mass and an impervious core rather than by the strength of concrete , standing 103 ft high and running 1,603 ft along its crest , built across Wanaque River in Passaic County . It was completed in 1928 , and is owned by North Jersey District Water Supply Commission .
Its recorded primary purpose is water supply — delivering water to its customers comes first, so drawdown here follows demand as much as it follows rainfall. NID classes it high hazard potential. That describes what a failure would cost downstream — loss of life would be expected — and says nothing about how likely a failure is, or what condition the dam is in. Its most recent condition assessment was satisfactory — no deficiencies recognised for expected loading. National Inventory of Dams record NJ00213 — U.S. Army Corps of Engineers, public domain.
USGS · reading Aug 31, 2026, 4:00 AM (UTC-04:00) Provisional
Pool elevation
94.74 ft
Datum NGVD29
% of conservation pool full
Not reported
Storage
Not reported
Recent trend
→Steady
+0.0 ft over the trend window
Woodcliff Lake at Hillsdale is held back by Woodcliff Lake Dam , an earthfill embankment, holding the pool back by sheer mass and an impervious core rather than by the strength of concrete , standing 38 ft high and running 1,500 ft along its crest , built across Pascalk Brook in Bergen County , near Hillsdale . It was completed in 1906 , and is owned by SUEZ Water New Jersey, Inc. .
Its recorded primary purpose is water supply — delivering water to its customers comes first, so drawdown here follows demand as much as it follows rainfall. NID classes it high hazard potential. That describes what a failure would cost downstream — loss of life would be expected — and says nothing about how likely a failure is, or what condition the dam is in. Its most recent condition assessment was satisfactory — no deficiencies recognised for expected loading. National Inventory of Dams record NJ00247 — U.S. Army Corps of Engineers, public domain.