Altnow Reservoir is an earth dam located in Harney County, Oregon, built in 1908. It carries a Low hazard potential classification.
Dam profile
NID height · 23 ft23 ft tall and 720 ft long. 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 Altnow Reservoir
The primary purpose of Altnow Reservoir is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by John and Suzanne Moon (private). It impounds the Warm Spring Creek near Drewsey.
The dam stands 23 feet tall and stretches 720 feet across, creates a reservoir covering 16 acres, has a maximum storage capacity of 120 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1908, 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 04/28/2009. That was over 17 years ago.
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Location
| State | Oregon |
| County | Harney |
| Nearest City | Drewsey |
| River/Stream | Warm Spring Creek |
| Coordinates | 43.86142, -118.28940 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 23 ft |
| Dam Height | 20 ft |
| Dam Length | 720 ft |
| Year Completed | 1908 (118 years old) |
Storage & Hydraulics
| NID Storage | 122 acre-ft |
| Max Storage | 120 acre-ft |
| Normal Storage | 122 acre-ft |
| Surface Area | 16 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 183 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | John and Suzanne Moon |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 04/28/2009 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | OR00604 |
| Federal ID | OR00604 |
| More Info | State Dam Safety Program |