Lake Macgregor Dam
Lake Macgregor Dam is an earth dam located in Putnam County, New York, built in 1955. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Lake Macgregor Dam
The primary purpose of Lake Macgregor Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Putnam County Department Of Public Works (local government). It impounds the Tr-muscoot River near Mohopac Falls.
The dam stands 38 feet tall and stretches 420 feet across, creates a reservoir covering 23 acres, has a maximum storage capacity of 250 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1955, the structure is well into its service life at over 50 years old.
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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 03/27/2024.
At 38 feet, this dam is taller than 85% of dams nationwide.
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Location
| State | New York |
| County | Putnam |
| Nearest City | Mohopac Falls |
| River/Stream | Tr-muscoot River |
| Coordinates | 41.37972, -73.77000 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 38 ft |
| Dam Height | 38 ft |
| Dam Length | 420 ft |
| Year Completed | 1955 (71 years old) |
Storage & Hydraulics
| NID Storage | 250 acre-ft |
| Max Storage | 250 acre-ft |
| Normal Storage | 240 acre-ft |
| Surface Area | 23 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 540 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Putnam County Department of Public Works |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 03/27/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NY00280 |
| Federal ID | NY00280 |
| More Info | State Dam Safety Program |