Cannonsville Dam
Cannonsville Dam is an earth dam located in Delaware County, New York, built in 1964. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Cannonsville Dam
The primary purpose of Cannonsville Dam is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Nycdep Dams West Of The Hudson River (local government). It impounds the West Branch Delaware River near Deposit.
The dam stands 175 feet tall and stretches 2,800 feet across, creates a reservoir covering 4,800 acres, has a maximum storage capacity of 450,000 acre-feet, and collects water from a drainage area of 450 square miles. Completed in 1964, the structure is well into its service life at over 50 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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 05/09/2024.
At 175 feet, this dam is taller than 99% of all dams in the United States.
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 | Delaware |
| Nearest City | Deposit |
| River/Stream | West Branch Delaware River |
| Coordinates | 42.06361, -75.37500 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 175 ft |
| Dam Height | 175 ft |
| Dam Length | 2,800 ft |
| Year Completed | 1964 (62 years old) |
Storage & Hydraulics
| NID Storage | 450,000 acre-ft |
| Max Storage | 450,000 acre-ft |
| Normal Storage | 300,999 acre-ft |
| Surface Area | 4,800 acres |
| Drainage Area | 450 sq mi |
| Max Discharge | 200,000 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | NYCDEP DAMS WEST OF THE HUDSON RIVER |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/09/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NY00542 |
| Federal ID | NY00542 |
| More Info | State Dam Safety Program |