Chiselhurst Dam
Chiselhurst Dam is a concrete dam located in Westchester County, New York, built in 1921. It carries a Significant hazard potential classification and has a poor condition assessment.
About Chiselhurst Dam
The primary purpose of Chiselhurst Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Stephen Mazias And Theresa Lant (private). It impounds the Tr-saw Mill River near Chappaqua.
The dam stands 20 feet tall and stretches 30 feet across, creates a reservoir covering 6 acres, has a maximum storage capacity of 44 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1921, the structure is over a century 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 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 01/06/2023.
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Location
| State | New York |
| County | Westchester |
| Nearest City | Chappaqua |
| River/Stream | Tr-saw Mill River |
| Coordinates | 41.14389, -73.75250 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 30 ft |
| Year Completed | 1921 (105 years old) |
Storage & Hydraulics
| NID Storage | 44 acre-ft |
| Max Storage | 44 acre-ft |
| Normal Storage | 40 acre-ft |
| Surface Area | 6 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Stephen Mazias and Theresa Lant |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 01/06/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NY13582 |
| Federal ID | NY13582 |
| More Info | State Dam Safety Program |