Armstrong Lake Dam is an earth dam located in Mason County, Washington, built in 1968. It carries a Low hazard potential classification.
Dam profile
NID height · 10 ft10 ft tall and 500 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 Armstrong Lake Dam
The primary purpose of Armstrong Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by West Coast Latvian Education Center (private). It impounds the North Fork Goldsborough Creek near Dayton.
The dam stands 10 feet tall and stretches 500 feet across, creates a reservoir covering 80 acres, and has a maximum storage capacity of 150 acre-feet. 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 03/14/2001. That was over 25 years ago.
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Location
| State | Washington |
| County | Mason |
| Nearest City | Dayton |
| River/Stream | North Fork Goldsborough Creek |
| Coordinates | 47.23083, -123.21273 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 10 ft |
| Dam Length | 500 ft |
| Year Completed | 1968 (58 years old) |
Storage & Hydraulics
| NID Storage | 150 acre-ft |
| Max Storage | 150 acre-ft |
| Normal Storage | 80 acre-ft |
| Surface Area | 80 acres |
Ownership & Safety
| Purpose | Recreation |
| Owner | West Coast Latvian Education Center |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 03/14/2001 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WA01283 |
| Federal ID | WA01283 |
| More Info | State Dam Safety Program |