South Pond Dam is an earth dam located in Nassau County, New York, built in 1903. It carries a Low hazard potential classification.
Dam profile
NID height · 13 ft13 ft tall and 800 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 South Pond Dam
The primary purpose of South Pond Dam is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Nys Office of Parks, Recreation & Historic Preservation- Long Island Region (state). It impounds the Mill River near Rockville Centre.
The dam stands 13 feet tall and stretches 800 feet across, creates a reservoir covering 21 acres, has a maximum storage capacity of 187 acre-feet, and collects water from a drainage area of 16 square miles. Completed in 1903, the structure is over a century 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 11/03/2016.
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Location
| State | New York |
| County | Nassau |
| Nearest City | Rockville Centre |
| River/Stream | Mill River |
| Coordinates | 40.66833, -73.65333 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 13 ft |
| Dam Height | 13 ft |
| Dam Length | 800 ft |
| Year Completed | 1903 (123 years old) |
Storage & Hydraulics
| NID Storage | 187 acre-ft |
| Max Storage | 187 acre-ft |
| Normal Storage | 83 acre-ft |
| Surface Area | 21 acres |
| Drainage Area | 16 sq mi |
| Max Discharge | 600 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Nys Office of Parks, Recreation & Historic Preservation- Long Island Region |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 11/03/2016 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NY00109 |
| Federal ID | NY00109 |
| More Info | State Dam Safety Program |