New York Dams
1,871 dams tracked by the National Inventory of Dams
Total Dams
1,871
High Hazard
419
22.4%
Poor / Unsatisfactory
289
Average Age
89 yrs
Hazard Classification
High419 (22.4%)
Significant544 (29.1%)
Low901 (48.2%)
Condition Assessment
Satisfactory348 (18.6%)
Fair98 (5.2%)
Poor / Unsatisfactory289 (15.4%)
Not Rated1,136 (60.7%)
Federal
26
State
281
Local
506
Private
785
Tallest Dams
- Mount Morris Dam249 ft
- Ashokan Dam213 ft
- Downsville Dam204 ft
- Merriman Dam195 ft
- Neversink Reservoir Dam190 ft
High Hazard Dams
- Mount Morris DamHigh
- Ashokan DamHigh
- Downsville DamHigh
- Merriman DamHigh
- Neversink Reservoir DamHigh
Poor Condition Dams
- Inghams DamPoor
- Toronto Unsatisfactory
- Mill Brook Site 2 DamPoor
- Sidney Reservoir #5 DamPoor
- 60 Foot DamPoor
All Dams in New York
Showing 1276–1300 of 1,871
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Oatka Creek Dam Genesee County | 15 | 1934 | Significant | Not Rated |
| O'Dell Marsh Dam Erie County | 7 | 1954 | Low | Not Rated |
| Odgen Heights Dam Monroe County | 8 | — | Significant | Not Rated |
| Ogdensburg St. Lawrence County | 12 | 1910 | High | Satisfactory |
| Old Brodhead Lake Dam Sullivan County | 33 | 2005 | Low | Not Rated |
| Old Fly Wildlife Dam Onondaga County | 9 | 1958 | Low | Not Rated |
| Old Forge Reservoir Dam Herkimer County | 18 | 1905 | Significant | Poor |
| Olmstedville Pond Dam Essex County | 10 | 1934 | Significant | Not Rated |
| Onderdonk Lake Dam Albany County | 11 | 1928 | Significant | Poor |
| Oneida #7 Pond #1 Dam & Dike Oneida County | 11 | 1958 | Low | Not Rated |
| Oneida #8 Pond Dam #3 Oneida County | 19 | 1961 | Significant | Not Rated |
| Oneida City Reservoir Dam Oneida County | 50 | 1926 | High | Poor |
| Oneida Water Supply Dam Madison County | 18 | 1925 | High | Fair |
| Onondaga Dam Onondaga County | 67 | 1949 | High | Satisfactory |
| Ontario Parks Dam Ontario County | 20 | 1966 | High | Not Rated |
| Onteora Pond Dam Greene County | 18 | 1924 | Significant | Poor |
| Oquaga Creek State Park Dam Broome County | 54 | 1976 | High | Poor |
| Oquaga Lake Dam Broome County | 7 | — | Low | Not Rated |
| Orchard Lake Dam Sullivan County | 16 | 1870 | Significant | Not Rated |
| Orchard Park Reservoir Dam Erie County | 22 | 1933 | Low | Not Rated |
| Oriskany Falls Dam Madison County | 15 | 1917 | Significant | Poor |
| Otisco Lake Dam Onondaga County | 18 | 1956 | High | Satisfactory |
| Otis Young Dam Cortland County | 14 | 1974 | Low | Not Rated |
| Otsego Lake Dam Otsego County | 11 | 1900 | Low | Not Rated |
| Otter Creek Dam Orleans County | 37 | 1916 | Significant | Poor |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.