Diamond Lake Dam is an earth dam located in Orange County, New York, built in 1956. It carries a Low hazard potential classification.
Dam profile
NID height · 11 ft11 ft tall and 420 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Diamond Lake Dam
The primary purpose of Diamond Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Orange County Department of Parks (local government). It impounds the Tr-wallkill River.
The dam stands 11 feet tall and stretches 420 feet across, creates a reservoir covering 40 acres, has a maximum storage capacity of 340 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1956, the structure is well into its service life at over 50 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. The most recent inspection on record was 11/16/1984. That was over 41 years ago.
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Location
| State | New York |
| County | Orange |
| Nearest City | None |
| River/Stream | Tr-wallkill River |
| Coordinates | 41.53889, -74.27867 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 11 ft |
| Dam Height | 11 ft |
| Dam Length | 420 ft |
| Year Completed | 1956 (70 years old) |
Storage & Hydraulics
| NID Storage | 340 acre-ft |
| Max Storage | 340 acre-ft |
| Normal Storage | 200 acre-ft |
| Surface Area | 40 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 340 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Orange County Department of Parks |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 11/16/1984 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NY00489 |
| Federal ID | NY00489 |
| More Info | State Dam Safety Program |