Hoefer-pierson Reservoir is an earth dam located in Washington County, Oregon, built in 1970. It carries a Significant hazard potential classification.
Dam profile
NID height · 23 ft23 ft tall and 376 ft long. 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 Hoefer-pierson Reservoir
The primary purpose of Hoefer-pierson Reservoir is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by James & Linda Pierson (private). It impounds the Christensen Creek near Individual Residences.
The dam stands 23 feet tall and stretches 376 feet across, creates a reservoir covering 2 acres, has a maximum storage capacity of 16 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1970, 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 10/22/2019.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Oregon |
| County | Washington |
| Nearest City | Individual Residences |
| River/Stream | Christensen Creek |
| Coordinates | 45.45917, -123.04740 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 23 ft |
| Dam Height | 23 ft |
| Dam Length | 376 ft |
| Year Completed | 1970 (56 years old) |
Storage & Hydraulics
| NID Storage | 16 acre-ft |
| Max Storage | 16 acre-ft |
| Normal Storage | 15 acre-ft |
| Surface Area | 2 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 652 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | James & Linda Pierson |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 10/22/2019 |
| Emergency Action Plan | No |
Identifiers
| NID ID | OR01933 |
| Federal ID | OR01933 |
| More Info | State Dam Safety Program |