Unger-bill Dam is an earth dam located in Washington County, Oregon, built in 1968. It carries a Significant hazard potential classification.
Dam profile
NID height · 40 ft40 ft tall and 530 ft long, taller than 86% 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 Unger-bill Dam
The primary purpose of Unger-bill Dam is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Ronald and Debra Hochstein (private). It impounds the Tualatin River, Trib to near Farmington.
The dam stands 40 feet tall and stretches 530 feet across, creates a reservoir covering 5 acres, has a maximum storage capacity of 97 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1968, 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 11/14/2019.
At 40 feet, this dam is taller than 86% of dams nationwide.
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Location
| State | Oregon |
| County | Washington |
| Nearest City | Farmington |
| River/Stream | Tualatin River, Trib to |
| Coordinates | 45.46891, -123.05806 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 40 ft |
| Dam Height | 39 ft |
| Dam Length | 530 ft |
| Year Completed | 1968 (58 years old) |
Storage & Hydraulics
| NID Storage | 97 acre-ft |
| Max Storage | 97 acre-ft |
| Normal Storage | 80 acre-ft |
| Surface Area | 5 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 32 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Ronald and Debra Hochstein |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 11/14/2019 |
| Emergency Action Plan | No |
Identifiers
| NID ID | OR00461 |
| Federal ID | OR00461 |
| More Info | State Dam Safety Program |