Dieterich Dam #3
Dieterich Dam #3 is a masonry dam located in Dutchess County, New York, built in 1910. It carries a Significant hazard potential classification and has a poor condition assessment.
About Dieterich Dam #3
The primary purpose of Dieterich Dam #3 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Hitchcock Cattle Corporation (private). It impounds the Wappinger Creek near Millbrook.
The dam stands 14 feet tall and stretches 55 feet across, creates a reservoir covering 31 acres, has a maximum storage capacity of 200 acre-feet, and collects water from a drainage area of 12 square miles. Completed in 1910, 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 11/06/2024.
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Location
| State | New York |
| County | Dutchess |
| Nearest City | Millbrook |
| River/Stream | Wappinger Creek |
| Coordinates | 41.79433, -73.69250 |
Physical Characteristics
| Dam Type | Masonry |
| NID Height | 14 ft |
| Dam Height | 14 ft |
| Dam Length | 55 ft |
| Year Completed | 1910 (116 years old) |
Storage & Hydraulics
| NID Storage | 200 acre-ft |
| Max Storage | 200 acre-ft |
| Normal Storage | 110 acre-ft |
| Surface Area | 31 acres |
| Drainage Area | 12 sq mi |
| Max Discharge | 925 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | HITCHCOCK CATTLE CORPORATION |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 11/06/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NY13822 |
| Federal ID | NY13822 |
| More Info | State Dam Safety Program |