High Risk Dams in New Jersey

New Jersey has 56 high hazard dams with a condition assessment of poor or unsatisfactory. These are dams where failure would probably cause loss of human life and where recognized safety deficiencies have been identified.

Of the 232 high hazard dams in New Jersey, 56 (24%) have concerning condition ratings — 56 rated poor and 0 rated unsatisfactory.

Dam	County	Height (ft)	Condition	Purpose	Year
Round Valley South Dam	Hunterdon	178	Poor	Water Supply	1961
Round Valley North Dam	Hunterdon	135	Poor	Water Supply	1961
Spruce Run Reservoir Dam	Hunterdon	93	Poor	Water Supply	1964
Round Valley Dike	Hunterdon	80	Poor	Water Supply	1961
Oak Ridge Reservoir Dam	Passaic	60	Poor	Water Supply	1892
West Branch Reservoir Dam	Somerset	39	Poor	Recreation	1930
Warren Mill Dam	Hunterdon	38	Poor	Water Supply	1916
Hackettstown Res. Dam	Morris	38	Poor	Water Supply
Assunpink #18 Dam	Monmouth	38	Poor	Flood Risk Reduction
Union Lake Dam	Cumberland	35	Poor	Recreation	1869
Cupsaw Lake Dam	Passaic	35	Poor	Recreation	1930
Powder Mill Pond Dam	Morris	35	Poor	Recreation
Macopin Reservoir Dam	Morris	34	Poor	Water Supply	1892
Pleasant Valley Lake Dam	Sussex	31	Poor	Recreation
Lake Lenape Dam	Atlantic	29	Poor	Recreation	1879
Stony Brook Water Shed #7 (hunt Lake) Dam	Mercer	28	Poor	Irrigation	1959
Lionshead Lake Dam	Passaic	27	Poor	Recreation	1939
Jaqui Mill Dam	Morris	27	Poor	Flood Risk Reduction	1920
River Wall Dam	Passaic	26	Poor	Recreation	1961
Stump Pond Dam	Sussex	25	Poor	Recreation
Assunpink #4 Dam	Monmouth	24	Poor	Flood Risk Reduction
Longwood Lake Dam	Morris	22	Poor	Recreation	1898
Lake Arcadia Dam #1	Passaic	22	Poor	Recreation	1926
High Crest Lake Dam	Passaic	22	Poor	Recreation	1952
Lake Conway Dam	Sussex	21	Poor	Recreation	1958
Lake Vreeland Dam	Bergen	20	Poor	Recreation	1917
Wadsworth Lake Dam	Gloucester	20	Poor	Recreation	1926
Matawan Lake Dam	Monmouth	20	Poor	Recreation	1923
Assunpink #8 Dam	Mercer	20	Poor	Water Supply
Elkinton Pond Dam	Salem	20	Poor	Recreation	1923
Birchwood Lake Dam	Morris	20	Poor	Recreation
Prospertown Dam	Ocean	19	Poor	Flood Risk Reduction	1966
Atsion Lake Dam	Burlington	19	Poor	Recreation	1930
Lake Estling Dam	Morris	19	Poor	Recreation	1870
Youngs Pond Dam	Warren	18	Poor	Recreation	1972
Centennial Lake Dam	Burlington	18	Poor	Recreation
Cranberry Lake Dam	Sussex	18	Poor	Recreation
Valhalla Lake Dam	Morris	18	Poor	Recreation	1910
Lake Hopatcong Dam	Morris	17	Poor	Flood Risk Reduction	1925
Greenwood Lake Dam	Passaic	17	Poor	Recreation	1928
Camp Beisler Dam	Hunterdon	17	Poor	Recreation	1971
Saxton Falls Dam	Morris	16	Poor	Recreation	1927
Lake Lefferts Dam	Monmouth	16	Poor	Recreation	1928
West Milford Lake Dam	Passaic	16	Poor	Recreation	1929
Lake Winona Dam	Morris	15	Poor	Recreation	1950
Lake Panorama Dike	Sussex	15	Poor	Recreation	1987
New Jersey No Name # 40 Dam	Passaic	15	Poor	Recreation
Ramapo Lake Dam	Bergen	13	Poor	Recreation
Mountain Creek Lake Dam	Sussex	12	Poor	Recreation	1984
Lake Denmark	Morris	12	Poor	Water Supply	1904
Diversion Dam	Sussex	8	Poor	Water Supply	1959
Memorial Park Pond Dam	Somerset	8	Poor	Recreation
Sunset Lake Dam	Morris	8	Poor	Recreation	1914
Upper Mount Glen Lake Dam	Passaic	8	Poor	Recreation	1927
Core Wall Dam	Passaic	7	Poor	Recreation
West Shore Trail Dam	Sussex	0	Poor

← All dams in New Jersey · High risk dams nationwide