Dams in New Jersey
%!s(int=829)Total Dams
232High Hazard
332Significant
265Low Hazard
Dam Safety in New Jersey
New Jersey has 829 dams tracked in the National Inventory of Dams. Of these, 232 (27%) are classified as high hazard — meaning failure would probably cause loss of human life — and 332 are classified as significant hazard. Currently, 233 dams in the state have a condition assessment of poor or unsatisfactory, indicating recognized safety deficiencies.
The average dam in New Jersey is 95 years old. Many of these aging structures were built before modern dam safety standards were established, which increases the importance of regular inspections and maintenance. The most common purpose for dams in New Jersey is recreation, accounting for 609 of the state's dams.
Use the search above to find dams near any address in New Jersey, or browse by county below. Each dam listing includes its hazard potential classification, condition assessment, physical characteristics, and inspection history from the NID.
New Jersey Dam Facts
| Total Dams | 829 |
| High Hazard Dams | 232 |
| Average Dam Age | 95 years |
| Tallest Dam | 280 ft |
| Largest Reservoir | 196,600 acre-ft |
| Poor/Unsatisfactory Condition | 233 |
Notable Dams in New Jersey
Counties in New Jersey
Atlantic25 dams1 high hazardBergen28 dams7 high hazardBurlington73 dams10 high hazardCamden26 dams1 high hazardCape May8 damsCumberland22 dams3 high hazardEssex13 dams8 high hazardGloucester37 dams2 high hazardHudson1 dams1 high hazardHunterdon26 dams10 high hazardMercer25 dams8 high hazardMiddlesex22 dams4 high hazardMonmouth44 dams12 high hazardMorris109 dams42 high hazardOcean48 dams8 high hazardPassaic85 dams50 high hazardSalem35 dams1 high hazardSomerset17 dams5 high hazardSussex138 dams41 high hazardUnion14 dams3 high hazardWarren33 dams15 high hazard
High Hazard Dams in New Jersey
| Dam | County | Height | Condition | Purpose |
|---|---|---|---|---|
| Merrill Creek Main Dam | Warren | 280 ft | Satisfactory | Other |
| Round Valley South Dam | Hunterdon | 178 ft | Poor | Water Supply |
| Monksville Dam | Passaic | 150 ft | Satisfactory | Water Supply |
| Round Valley North Dam | Hunterdon | 135 ft | Poor | Water Supply |
| Boonton Dam | Morris | 120 ft | Satisfactory | Water Supply |
| Raymond Dam | Passaic | 103 ft | Satisfactory | Water Supply |
| Charlotteburg Dam | Morris | 102 ft | Satisfactory | Water Supply |
| Spruce Run Reservoir Dam | Hunterdon | 93 ft | Poor | Water Supply |
| Round Valley Dike | Hunterdon | 80 ft | Poor | Water Supply |
| Clyde Potts Reservoir Dam | Morris | 80 ft | Fair | Water Supply |
| Great Notch Reservoir Dam | Passaic | 74 ft | Satisfactory | Water Supply |
| Canistear Reservoir #1 Dam | Sussex | 70 ft | Fair | Water Supply |
| Yards Creek Upper - Main Dam | Warren | 70 ft | Satisfactory | Hydroelectric |
| Glendola Reservoir Dam | Monmouth | 65 ft | Satisfactory | Water Supply |
| Green Swamp #4 Dam | Passaic | 65 ft | Satisfactory | Water Supply |
| Green Swamp #2 Dam | Passaic | 65 ft | Satisfactory | Water Supply |
| Midvale Dam | Passaic | 61 ft | Satisfactory | Water Supply |
| Oak Ridge Reservoir Dam | Passaic | 60 ft | Poor | Water Supply |
| Canoe Brook Reservoir #3 Dam | Essex | 57 ft | Satisfactory | Water Supply |
| Clinton Reservoir Dam | Passaic | 56 ft | Fair | Water Supply |
| Point View Dam | Passaic | 55 ft | Satisfactory | Recreation |
| Cedar Grove West Res Dam | Essex | 55 ft | Fair | Water Supply |
| Furnace Brook W.s. #2 Dam | Warren | 55 ft | Satisfactory | Flood Risk Reduction |
| Yards Creek Lower - Main Dam | Warren | 55 ft | Satisfactory | Hydroelectric |
| Manasquan Reservoir Dam | Monmouth | 53 ft | Satisfactory | Water Supply |
| Trenton Reservoir Dam | Mercer | 52 ft | Fair | Water Supply |
| Yards Creek Upper - West Dike | Warren | 52 ft | Satisfactory | Hydroelectric |
| Cedar Grove North Res Dam | Passaic | 51 ft | Fair | Water Supply |
| Cedar Grove South Res Dam | Essex | 51 ft | Satisfactory | Water Supply |
| Swimming River Reservoir Dam | Monmouth | 45 ft | Satisfactory | Water Supply |
| Ravine Lake Dam | Somerset | 45 ft | Satisfactory | Recreation |
| Canistear Reservoir #2 Dam | Sussex | 44 ft | Fair | Water Supply |
| Pines Lake Dam | Passaic | 42 ft | Satisfactory | Recreation |
| Wolf Den Dam | Passaic | 42 ft | Satisfactory | Recreation |
| Lake Solitude Dam | Hunterdon | 42 ft | Satisfactory | Recreation |
| Canoe Brook Reservoir #3 Dike | Essex | 40 ft | Satisfactory | Water Supply |
| Highland Lake Dam | Passaic | 40 ft | Satisfactory | Recreation |
| Split Rock Pond Dam | Morris | 39 ft | Satisfactory | Water Supply |
| Merrill Creek Res. Se Dike | Warren | 39 ft | Satisfactory | Other |
| West Branch Reservoir Dam | Somerset | 39 ft | Poor | Recreation |
| Warren Mill Dam | Hunterdon | 38 ft | Poor | Water Supply |
| Hackettstown Res. Dam | Morris | 38 ft | Poor | Water Supply |
| Woodcliff Lake Dam | Bergen | 38 ft | Satisfactory | Water Supply |
| Assunpink #18 Dam | Monmouth | 38 ft | Poor | Flood Risk Reduction |
| Pleasant Valley Lake Dam | Morris | 35 ft | Satisfactory | Recreation |
| Union Lake Dam | Cumberland | 35 ft | Poor | Recreation |
| Cupsaw Lake Dam | Passaic | 35 ft | Poor | Recreation |
| Green Turtle Pond Dam | Passaic | 35 ft | Fair | Recreation |
| Powder Mill Pond Dam | Morris | 35 ft | Poor | Recreation |
| Yards Creek Lower - Auxiliary Dike | Warren | 35 ft | Satisfactory | Hydroelectric |
| Farrington Dam | Middlesex | 34 ft | Fair | Water Supply |
| Orange Reservoir Dam | Essex | 34 ft | Fair | Water Supply |
| Lake Tappan Dam | Bergen | 34 ft | Satisfactory | Water Supply |
| Macopin Reservoir Dam | Morris | 34 ft | Poor | Water Supply |
| East Branch Reservoir Dam | Somerset | 33 ft | Satisfactory | Recreation |
| Echo Lake Intake Dam | Passaic | 32 ft | Fair | Water Supply |
| Assunpink # 6 Dam | Mercer | 31 ft | Satisfactory | Flood Risk Reduction |
| Pleasant Valley Lake Dam | Sussex | 31 ft | Poor | Recreation |
| Kakeout Dam | Morris | 30 ft | Satisfactory | Water Supply |
| Bass Lake Dam | Warren | 30 ft | Satisfactory | Recreation |
| Parsippany Dike | Morris | 30 ft | Satisfactory | Water Supply |
| Yardley Road Lake Dam | Morris | 30 ft | Fair | Flood Risk Reduction |
| Overflow Weir Dam | Passaic | 30 ft | Satisfactory | Water Supply |
| Pompton Lakes Dam | Passaic | 30 ft | Satisfactory | Water Supply |
| Lake Lenape Dam | Atlantic | 29 ft | Poor | Recreation |
| Canoe Brook Reservoir #2 Dam | Essex | 29 ft | Satisfactory | Water Supply |
| Green Swamp #1 Dam | Passaic | 29 ft | Satisfactory | Water Supply |
| Paulinskill Water Shed #2 Dam | Sussex | 29 ft | Satisfactory | Flood Risk Reduction |
| Clove River Dam | Sussex | 28 ft | Fair | Recreation |
| Great Gorge Dam | Sussex | 28 ft | Satisfactory | Water Supply |
| Stony Brook Water Shed #7 (hunt Lake) Dam | Mercer | 28 ft | Poor | Irrigation |
| Lionshead Lake Dam | Passaic | 27 ft | Poor | Recreation |
| Robinson's Branch Reservoir Dam | Union | 27 ft | Satisfactory | Water Supply |
| Lake Lenape Dam | Sussex | 27 ft | Satisfactory | Recreation |
| Jaqui Mill Dam | Morris | 27 ft | Poor | Flood Risk Reduction |
| Mount Paul Dam | Morris | 26 ft | Satisfactory | Recreation |
| River Wall Dam | Passaic | 26 ft | Poor | Recreation |
| Assunpink #20 Dam | Mercer | 26 ft | Satisfactory | Flood Risk Reduction |
| New Street Reservoir Dam | Passaic | 26 ft | Fair | Water Supply |
| Steenykill Lake Dam | Sussex | 25 ft | Fair | Recreation |
| Stump Pond Dam | Sussex | 25 ft | Poor | Recreation |
| Oradell Reservoir Dam | Bergen | 25 ft | Fair | Water Supply |
| Canoe Brook Reservoir #1 Dam | Essex | 25 ft | Satisfactory | Water Supply |
| Haledon Reservoir Dam | Passaic | 25 ft | Satisfactory | Other |
| Assunpink #21 Dam | Mercer | 25 ft | Satisfactory | Flood Risk Reduction |
| Yards Creek Upper - S. W. Dike | Warren | 25 ft | Satisfactory | Hydroelectric |
| Shackamaxon Dam | Union | 24 ft | Fair | Irrigation |
| Lindy's Lake Dam | Passaic | 24 ft | Satisfactory | Recreation |
| Assunpink #4 Dam | Monmouth | 24 ft | Poor | Flood Risk Reduction |
| Skyline Lake #2 (upper) Dam | Passaic | 24 ft | Satisfactory | Recreation |
| Paulins Kill Site 4 Dam | Sussex | 24 ft | Satisfactory | Flood Risk Reduction |
| Millhurst Lake Dam | Monmouth | 23 ft | Satisfactory | Recreation |
| Untermeyer Dam | Morris | 23 ft | Satisfactory | Recreation |
| Robert Rooke Dam | Sussex | 23 ft | Satisfactory | Recreation |
| New Jersey No Name #31 Dam | Hunterdon | 23 ft | Satisfactory | Other |
| Longwood Lake Dam | Morris | 22 ft | Poor | Recreation |
| Fox Lake Dam | Morris | 22 ft | Satisfactory | Recreation |
| Lake Arcadia Dam #1 | Passaic | 22 ft | Poor | Recreation |
| Clearwater Detention Dam | Union | 22 ft | Fair | Flood Risk Reduction |
| High Crest Lake Dam | Passaic | 22 ft | Poor | Recreation |