Big
Big is a gravity dam located in Lake County, Oregon, built in 1966. It carries a Low hazard potential classification and has a fair condition assessment.
About Big
The primary purpose of Big is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Doi Blm (federal). It impounds the Trib Big Lake.
The dam stands 10 feet tall and stretches 420 feet across, creates a reservoir covering 640 acres, and has a maximum storage capacity of 875 acre-feet. Completed in 1966, 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. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 10/12/2017.
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Location
| State | Oregon |
| County | Lake |
| River/Stream | Trib Big Lake |
| Coordinates | 42.15521, -120.01061 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 10 ft |
| Dam Length | 420 ft |
| Year Completed | 1966 (60 years old) |
Storage & Hydraulics
| NID Storage | 875 acre-ft |
| Max Storage | 875 acre-ft |
| Normal Storage | 674 acre-ft |
| Surface Area | 640 acres |
| Max Discharge | 31 cfs |
Ownership & Safety
| Purpose | Water Supply |
| Owner | DOI BLM |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 10/12/2017 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | OR00757 |
| Federal ID | OR00757 |
| More Info | State Dam Safety Program |