Chauncey Stillman Dam
Chauncey Stillman Dam is an earth dam located in Dutchess County, New York, built in 1951. It carries a Significant hazard potential classification and has a fair condition assessment.
About Chauncey Stillman Dam
Chauncey Stillman Dam is a dam in Dutchess, New York. The dam is owned by Weathersfield Foundation Inc. (private). It impounds the Tr-wassaic Creek near Wassaic.
The dam stands 19 feet tall and stretches 1,030 feet across, creates a reservoir covering 9 acres, has a maximum storage capacity of 104 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1951, 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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 06/06/2023.
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Location
| State | New York |
| County | Dutchess |
| Nearest City | Wassaic |
| River/Stream | Tr-wassaic Creek |
| Coordinates | 41.87833, -73.62750 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 19 ft |
| Dam Height | 19 ft |
| Dam Length | 1,030 ft |
| Year Completed | 1951 (75 years old) |
Storage & Hydraulics
| NID Storage | 104 acre-ft |
| Max Storage | 104 acre-ft |
| Normal Storage | 65 acre-ft |
| Surface Area | 9 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 500 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Other |
| Owner | Weathersfield FOUNDATION Inc. |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 06/06/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NY00636 |
| Federal ID | NY00636 |
| More Info | State Dam Safety Program |