Mill Brook Site 1 Dam
Mill Brook Site 1 Dam is an earth dam located in Chenango County, New York, built in 1979. It carries a High hazard potential classification and has a fair condition assessment.
About Mill Brook Site 1 Dam
The primary purpose of Mill Brook Site 1 Dam is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Chenango County (local government). It impounds the Tr-unadilla River near New Berlin.
The dam stands 52 feet tall and stretches 470 feet across, creates a reservoir covering 1 acres, has a maximum storage capacity of 395 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1979, the structure is 47 years old.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. 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 09/30/2024.
At 52 feet, this dam is taller than 93% of dams nationwide.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The New York dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | New York |
| County | Chenango |
| Nearest City | New Berlin |
| River/Stream | Tr-unadilla River |
| Coordinates | 42.63278, -75.34694 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 52 ft |
| Dam Height | 52 ft |
| Dam Length | 470 ft |
| Year Completed | 1979 (47 years old) |
Storage & Hydraulics
| NID Storage | 395 acre-ft |
| Max Storage | 395 acre-ft |
| Normal Storage | 3 acre-ft |
| Surface Area | 1 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 8,850 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | CHENANGO COUNTY |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Fair |
| Last Inspection | 09/30/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NY00715 |
| Federal ID | NY00715 |
| More Info | State Dam Safety Program |