Lake Skenonto Dam
Lake Skenonto Dam is a concrete dam located in Orange County, New York, built in 1934. It carries a Significant hazard potential classification and has a poor condition assessment.
About Lake Skenonto Dam
The primary purpose of Lake Skenonto Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Nysoprhp - Palisades Interstate Park Commission (state). It impounds the Tr-lake Sebago near Sloatsburg.
The dam stands 29 feet tall and stretches 570 feet across, creates a reservoir covering 37 acres, and has a maximum storage capacity of 520 acre-feet. Completed in 1934, the structure is well-established, with more than 75 years of service.
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. An emergency action plan is in place for this dam. The most recent inspection on record was 10/14/2021.
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Location
| State | New York |
| County | Orange |
| Nearest City | Sloatsburg |
| River/Stream | Tr-lake Sebago |
| Coordinates | 41.21111, -74.14278 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 29 ft |
| Dam Height | 29 ft |
| Dam Length | 570 ft |
| Year Completed | 1934 (92 years old) |
Storage & Hydraulics
| NID Storage | 520 acre-ft |
| Max Storage | 520 acre-ft |
| Normal Storage | 500 acre-ft |
| Surface Area | 37 acres |
| Max Discharge | 720 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | NYSOPRHP - PALISADES INTERSTATE PARK COMMISSION |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 10/14/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NY00487 |
| Federal ID | NY00487 |
| More Info | State Dam Safety Program |