Lawson Lake Dam
Lawson Lake Dam is an earth dam located in San Juan County, Washington, built in 1948. It carries a Low hazard potential classification and has a fair condition assessment.
About Lawson Lake Dam
The primary purpose of Lawson Lake Dam is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Richard Lawson Llc (private). It impounds the Tr-cady Mountain Creek.
The dam stands 17 feet tall and stretches 220 feet across, creates a reservoir covering 12 acres, has a maximum storage capacity of 100 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1948, the structure is well-established, with more than 75 years of service.
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 04/05/2021.
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Location
| State | Washington |
| County | San Juan |
| River/Stream | Tr-cady Mountain Creek |
| Coordinates | 48.54706, -123.12315 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 17 ft |
| Dam Length | 220 ft |
| Year Completed | 1948 (78 years old) |
Storage & Hydraulics
| NID Storage | 100 acre-ft |
| Max Storage | 100 acre-ft |
| Normal Storage | 65 acre-ft |
| Surface Area | 12 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 10 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Richard Lawson LLC |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 04/05/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WA00185 |
| Federal ID | WA00185 |
| More Info | State Dam Safety Program |