Lower Lake Dam
Lower Lake Dam is an earth dam located in Suffolk County, New York, built in 1940. It carries a Low hazard potential classification.
About Lower Lake Dam
The primary purpose of Lower Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Suffolk County Department Of Public Works (local government). It impounds the Carmans River near Shirley.
The dam stands 12 feet tall and stretches 600 feet across, creates a reservoir covering 26 acres, has a maximum storage capacity of 156 acre-feet, and collects water from a drainage area of 71 square miles. Completed in 1940, the structure is well-established, with more than 75 years of service.
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 10/14/2011. That was over 14 years ago.
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Location
| State | New York |
| County | Suffolk |
| Nearest City | Shirley |
| River/Stream | Carmans River |
| Coordinates | 40.83500, -72.91667 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 12 ft |
| Dam Height | 12 ft |
| Dam Length | 600 ft |
| Year Completed | 1940 (86 years old) |
Storage & Hydraulics
| NID Storage | 156 acre-ft |
| Max Storage | 156 acre-ft |
| Normal Storage | 78 acre-ft |
| Surface Area | 26 acres |
| Drainage Area | 71 sq mi |
| Max Discharge | 140 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Recreation |
| Owner | SUFFOLK COUNTY DEPARTMENT OF PUBLIC WORKS |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Last Inspection | 10/14/2011 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NY01339 |
| Federal ID | NY01339 |
| More Info | State Dam Safety Program |