Bennettsen Lake Dam is an earth dam located in Mason County, Washington, built in 1971. It carries a Low hazard potential classification.
Dam profile
NID height · 11 ft11 ft tall and 150 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 Bennettsen Lake Dam
The primary purpose of Bennettsen Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Wa DNR State Land Divisions (state). It impounds the Tr-tahuya River.
The dam stands 11 feet tall and stretches 150 feet across, creates a reservoir covering 28 acres, has a maximum storage capacity of 270 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1971, 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 06/03/2001. That was over 25 years ago.
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Location
| State | Washington |
| County | Mason |
| River/Stream | Tr-tahuya River |
| Coordinates | 47.46827, -122.95973 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 11 ft |
| Dam Length | 150 ft |
| Year Completed | 1971 (55 years old) |
Storage & Hydraulics
| NID Storage | 270 acre-ft |
| Max Storage | 270 acre-ft |
| Normal Storage | 253 acre-ft |
| Surface Area | 28 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 37 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Wa DNR State Land Divisions |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 06/03/2001 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WA00351 |
| Federal ID | WA00351 |
| More Info | State Dam Safety Program |