Mckay Dam is an earth dam located in Umatilla County, Oregon, built in 1927. It carries a High hazard potential classification.
Dam profile
NID height · 165 ft165 ft tall and 2,700 ft long, taller than 99% of U.S. dams with a recorded height. Height is drawn to scale against the Statue of Liberty, 305 ft ground to torch; the profile is a generic embankment section and the water level is illustrative.
About Mckay Dam
The primary purpose of Mckay 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 Bureau of Reclamation (federal). It impounds the Mckay Creek.
The dam stands 165 feet tall and stretches 2,700 feet across, creates a reservoir covering 1,200 acres, has a maximum storage capacity of 71,534 acre-feet, and collects water from a drainage area of 193 square miles. Completed in 1927, the structure is well-established, with more than 75 years of service.
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. An emergency action plan is in place for this dam. The most recent inspection on record was 08/02/2022.
At 165 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 Oregon 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 | Oregon |
| County | Umatilla |
| River/Stream | Mckay Creek |
| Coordinates | 45.60620, -118.79520 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 165 ft |
| Dam Height | 165 ft |
| Dam Length | 2,700 ft |
| Year Completed | 1927 (99 years old) |
Storage & Hydraulics
| NID Storage | 71,534 acre-ft |
| Max Storage | 71,534 acre-ft |
| Normal Storage | 67,800 acre-ft |
| Surface Area | 1,200 acres |
| Drainage Area | 193 sq mi |
| Max Discharge | 28,791 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Bureau of Reclamation |
| Owner Type | Federal |
| Hazard Classification | High |
| Condition Assessment | Not assessed |
| Last Inspection | 08/02/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | OR00583 |
| Federal ID | OR00583 |
| More Info | State Dam Safety Program |