Salmonberry Reservoir is an earth dam located in Columbia County, Oregon, built in 1960. It carries a Significant hazard potential classification.
Dam profile
NID height · 35 ft35 ft tall and 530 ft long, taller than 80% 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 Salmonberry Reservoir
The primary purpose of Salmonberry Reservoir 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 St. Helens (local government). It impounds the Salmon Creek near Trenholm.
The dam stands 35 feet tall and stretches 530 feet across, creates a reservoir covering 5 acres, has a maximum storage capacity of 61 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1960, the structure is well into its service life at over 50 years 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. The most recent inspection on record was 10/24/2020.
At 35 feet, this dam is taller than 80% of dams nationwide.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Oregon |
| County | Columbia |
| Nearest City | Trenholm |
| River/Stream | Salmon Creek |
| Coordinates | 45.88597, -122.93462 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 35 ft |
| Dam Height | 35 ft |
| Dam Length | 530 ft |
| Year Completed | 1960 (66 years old) |
Storage & Hydraulics
| NID Storage | 61 acre-ft |
| Max Storage | 61 acre-ft |
| Normal Storage | 61 acre-ft |
| Surface Area | 5 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 330 cfs |
Ownership & Safety
| Purpose | Water Supply |
| Owner | City of St. Helens |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 10/24/2020 |
| Emergency Action Plan | No |
Identifiers
| NID ID | OR02958 |
| Federal ID | OR02958 |
| More Info | State Dam Safety Program |