Mahon Reservoir
Mahon Reservoir is an earth dam located in Harney County, Oregon, built in 1904. It carries a Low hazard potential classification.
About Mahon Reservoir
The primary purpose of Mahon Reservoir is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Tree Top Ranches, Ltd. (private). It impounds the Camp Creek & South Fork Malheur River near Venator.
The dam stands 31 feet tall and stretches 1,200 feet across, creates a reservoir covering 12 acres, has a maximum storage capacity of 2,000 acre-feet, and collects water from a drainage area of 30 square miles. Completed in 1904, the structure is over a century 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 08/15/2012. That was over 13 years ago.
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Location
| State | Oregon |
| County | Harney |
| Nearest City | Venator |
| River/Stream | Camp Creek & South Fork Malheur River |
| Coordinates | 43.15387, -118.39911 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 31 ft |
| Dam Height | 25 ft |
| Dam Length | 1,200 ft |
| Year Completed | 1904 (122 years old) |
Storage & Hydraulics
| NID Storage | 3,456 acre-ft |
| Max Storage | 2,000 acre-ft |
| Normal Storage | 3,456 acre-ft |
| Surface Area | 12 acres |
| Drainage Area | 30 sq mi |
| Max Discharge | 90 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | TREE TOP RANCHES, LTD. |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Last Inspection | 08/15/2012 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | OR00603 |
| Federal ID | OR00603 |
| More Info | State Dam Safety Program |