Thompson Valley Diversion (slid)
Thompson Valley Diversion (slid) is an earth dam located in Lake County, Oregon, built in 1915. It carries a Significant hazard potential classification.
About Thompson Valley Diversion (slid)
The primary purpose of Thompson Valley Diversion (slid) is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by John Monfore Weyerhaeser Company (private). It impounds the Silver And West Fork Silver Creek near Silver Lake.
The dam stands 48 feet tall and stretches 244 feet across, creates a reservoir covering 40 acres, has a maximum storage capacity of 460 acre-feet, and collects water from a drainage area of 180 square miles. Completed in 1915, the structure is over a century 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 08/01/2016.
At 48 feet, this dam is taller than 92% of dams nationwide.
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Location
| State | Oregon |
| County | Lake |
| Nearest City | Silver Lake |
| River/Stream | Silver And West Fork Silver Creek |
| Coordinates | 43.09186, -121.07931 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 48 ft |
| Dam Height | 48 ft |
| Dam Length | 244 ft |
| Year Completed | 1915 (111 years old) |
Storage & Hydraulics
| NID Storage | 460 acre-ft |
| Max Storage | 460 acre-ft |
| Normal Storage | 460 acre-ft |
| Surface Area | 40 acres |
| Drainage Area | 180 sq mi |
| Max Discharge | 5,000 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | JOHN MONFORE WEYERHAESER COMPANY |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not Rated |
| Last Inspection | 08/01/2016 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | OR00126 |
| Federal ID | OR00126 |
| More Info | State Dam Safety Program |