Twigg Reservoir
Twigg Reservoir is an earth dam located in Washington County, Oregon, built in 1957. It carries a Low hazard potential classification.
About Twigg Reservoir
The primary purpose of Twigg Reservoir is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Joseph Twigg (private). It impounds the Unnamed Trib/christensen Creek near No Downstream Settlement.
The dam stands 16 feet tall and stretches 240 feet across, creates a reservoir covering 14 acres, and has a maximum storage capacity of 65 acre-feet. Completed in 1957, the structure is well into its service life at over 50 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. The most recent inspection on record was 11/09/2016.
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Location
| State | Oregon |
| County | Washington |
| Nearest City | No Downstream Settlement |
| River/Stream | Unnamed Trib/christensen Creek |
| Coordinates | 45.43595, -123.00237 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 16 ft |
| Dam Height | 16 ft |
| Dam Length | 240 ft |
| Year Completed | 1957 (69 years old) |
Storage & Hydraulics
| NID Storage | 65 acre-ft |
| Max Storage | 65 acre-ft |
| Normal Storage | 64 acre-ft |
| Surface Area | 14 acres |
Ownership & Safety
| Purpose | Irrigation |
| Owner | JOSEPH TWIGG |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Last Inspection | 11/09/2016 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | OR03732 |
| Federal ID | OR03732 |
| More Info | State Dam Safety Program |