Mainline 3 is an earth dam located in Crook County, Oregon, built in 1971. It carries a Significant hazard potential classification.
Dam profile
NID height · 42 ft42 ft tall and 200 ft long, taller than 88% 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 Mainline 3
The primary purpose of Mainline 3 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 Cemetery Creek near Post.
The dam stands 42 feet tall and stretches 200 feet across, creates a reservoir covering 12 acres, has a maximum storage capacity of 350 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1971, 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 02/27/2020.
At 42 feet, this dam is taller than 88% of dams nationwide.
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Location
| State | Oregon |
| County | Crook |
| Nearest City | Post |
| River/Stream | Cemetery Creek |
| Coordinates | 44.09211, -120.19557 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 42 ft |
| Dam Height | 37 ft |
| Dam Length | 200 ft |
| Year Completed | 1971 (55 years old) |
Storage & Hydraulics
| NID Storage | 350 acre-ft |
| Max Storage | 350 acre-ft |
| Normal Storage | 168 acre-ft |
| Surface Area | 12 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 67 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Waibel Ranches LLC |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 02/27/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | OR00493 |
| Federal ID | OR00493 |
| More Info | State Dam Safety Program |