Harrison Dam is an earth dam located in Orange County, New York. It carries a Significant hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 15 ft15 ft tall and 115 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 Harrison Dam
The primary purpose of Harrison Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Richard Massimi (private). It impounds the Quassaic Creek near Newburg.
The dam stands 15 feet tall and stretches 115 feet across, creates a reservoir covering 5 acres, and has a maximum storage capacity of 5 acre-feet.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 10/25/2023.
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Location
| State | New York |
| County | Orange |
| Nearest City | Newburg |
| River/Stream | Quassaic Creek |
| Coordinates | 41.50000, -74.04250 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 115 ft |
Storage & Hydraulics
| NID Storage | 5 acre-ft |
| Max Storage | 5 acre-ft |
| Normal Storage | 4 acre-ft |
| Surface Area | 5 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Richard Massimi |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 10/25/2023 |
| Emergency Action Plan | No |
Identifiers
| NID ID | NY13154 |
| Federal ID | NY13154 |
| More Info | State Dam Safety Program |