Pons Lake Reservoir is an earth dam located in Grant County, Oregon, built in 1968. It carries a Low hazard potential classification.
Dam profile
NID height · 20 ft20 ft tall and 750 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 Pons Lake Reservoir
The primary purpose of Pons Lake Reservoir is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Silvies Vally Ranch (private). It impounds the Bridge Creek& Cottonwood Creek near Burns.
The dam stands 20 feet tall and stretches 750 feet across, creates a reservoir covering 136 acres, has a maximum storage capacity of 785 acre-feet, and collects water from a drainage area of 17 square miles. Completed in 1968, 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 10/11/2016. That was over 10 years ago.
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Location
| State | Oregon |
| County | Grant |
| Nearest City | Burns |
| River/Stream | Bridge Creek& Cottonwood Creek |
| Coordinates | 44.04302, -118.93278 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 750 ft |
| Year Completed | 1968 (58 years old) |
Storage & Hydraulics
| NID Storage | 785 acre-ft |
| Max Storage | 785 acre-ft |
| Normal Storage | 785 acre-ft |
| Surface Area | 136 acres |
| Drainage Area | 17 sq mi |
| Max Discharge | 225 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Silvies Vally Ranch |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 10/11/2016 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | OR00445 |
| Federal ID | OR00445 |
| More Info | State Dam Safety Program |