Cobbs Hill Reservoir Dam is an other dam located in Monroe County, New York, built in 1908. It carries a High hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 25 ft25 ft tall and 3,560 ft long, taller than 50% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Cobbs Hill Reservoir Dam
The primary purpose of Cobbs Hill Reservoir 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 City of Rochester (local government). It impounds the None near Rochester.
The dam stands 25 feet tall and stretches 3,560 feet across, creates a reservoir covering 18 acres, has a maximum storage capacity of 535 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1908, the structure is over a century 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 03/20/2025.
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 | Monroe |
| Nearest City | Rochester |
| River/Stream | None |
| Coordinates | 43.13889, -77.57222 |
Physical Characteristics
| Dam Type | Other |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 3,560 ft |
| Year Completed | 1908 (118 years old) |
Storage & Hydraulics
| NID Storage | 535 acre-ft |
| Max Storage | 535 acre-ft |
| Normal Storage | 442 acre-ft |
| Surface Area | 18 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 330 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | City of Rochester |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 03/20/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NY01448 |
| Federal ID | NY01448 |
| More Info | State Dam Safety Program |