Mainline 1 is an earth dam located in Crook County, Oregon, built in 1969. It carries a Significant hazard potential classification.
Dam profile
NID height · 57 ft57 ft tall and 460 ft long, taller than 94% of U.S. dams with a recorded height. Height is drawn to scale against a ten-story building, about 100 ft; the profile is a generic embankment section and the water level is illustrative.
About Mainline 1
The primary purpose of Mainline 1 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Waibel Ranches LLC (private). It impounds the Maury Creek near Post.
The dam stands 57 feet tall and stretches 460 feet across, creates a reservoir covering 20 acres, has a maximum storage capacity of 500 acre-feet, and collects water from a drainage area of 5 square miles. Completed in 1969, 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 12/18/2018.
At 57 feet, this dam is taller than 94% of dams nationwide.
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Location
| State | Oregon |
| County | Crook |
| Nearest City | Post |
| River/Stream | Maury Creek |
| Coordinates | 44.10575, -120.20470 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 57 ft |
| Dam Height | 57 ft |
| Dam Length | 460 ft |
| Year Completed | 1969 (57 years old) |
Storage & Hydraulics
| NID Storage | 500 acre-ft |
| Max Storage | 500 acre-ft |
| Normal Storage | 445 acre-ft |
| Surface Area | 20 acres |
| Drainage Area | 5 sq mi |
| Max Discharge | 611 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Waibel Ranches LLC |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 12/18/2018 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | OR00452 |
| Federal ID | OR00452 |
| More Info | State Dam Safety Program |