Mallory Dam is a concrete dam located in Oswego County, New York, built in 1909. It carries a Significant hazard potential classification.
Dam profile
NID height · 6 ft6 ft tall and 352 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Mallory Dam
The primary purpose of Mallory Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by John Cronk, Hawk Cable & Pipe (private). It impounds the Dykeman Creek near Mallory.
The dam stands 6 feet tall and stretches 352 feet across, creates a reservoir covering 9 acres, and has a maximum storage capacity of 18 acre-feet. Completed in 1909, 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. An emergency action plan is in place for this dam. The most recent inspection on record was 10/04/2023.
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Location
| State | New York |
| County | Oswego |
| Nearest City | Mallory |
| River/Stream | Dykeman Creek |
| Coordinates | 43.32278, -76.11639 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 6 ft |
| Dam Height | 6 ft |
| Dam Length | 352 ft |
| Year Completed | 1909 (117 years old) |
Storage & Hydraulics
| NID Storage | 18 acre-ft |
| Max Storage | 18 acre-ft |
| Normal Storage | 18 acre-ft |
| Surface Area | 9 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | John Cronk, Hawk Cable & Pipe |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 10/04/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NY14294 |
| Federal ID | NY14294 |
| More Info | State Dam Safety Program |