Jefferts Dam
Jefferts Dam is an earth dam located in San Juan County, Washington, built in 1988. It carries a Low hazard potential classification.
About Jefferts Dam
The primary purpose of Jefferts Dam is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Lynnbahrych (private). It impounds the Tr-san Juan Channel.
The dam stands 15 feet tall and stretches 275 feet across, creates a reservoir covering 5 acres, has a maximum storage capacity of 52 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1988, the structure is 38 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.
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Location
| State | Washington |
| County | San Juan |
| River/Stream | Tr-san Juan Channel |
| Coordinates | 48.58464, -122.99210 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Length | 275 ft |
| Year Completed | 1988 (38 years old) |
Storage & Hydraulics
| NID Storage | 52 acre-ft |
| Max Storage | 52 acre-ft |
| Normal Storage | 32 acre-ft |
| Surface Area | 5 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 100 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | LynnBahrych |
| Owner Type | Private |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WA01638 |
| Federal ID | WA01638 |
| More Info | State Dam Safety Program |