Sylvia Lake Dam Pierce Co is an earth dam located in Pierce County, Washington, built in 1963. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 16 ft16 ft tall and 390 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 Sylvia Lake Dam Pierce Co
The primary purpose of Sylvia Lake Dam Pierce Co is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Sylvia Lake Country Club (private). It impounds the Tr-puget Sound.
The dam stands 16 feet tall and stretches 390 feet across, creates a reservoir covering 6 acres, has a maximum storage capacity of 142 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1963, the structure is well into its service life at over 50 years 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. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 07/29/2021.
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Location
| State | Washington |
| County | Pierce |
| River/Stream | Tr-puget Sound |
| Coordinates | 47.32094, -122.65274 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 16 ft |
| Dam Length | 390 ft |
| Year Completed | 1963 (63 years old) |
Storage & Hydraulics
| NID Storage | 142 acre-ft |
| Max Storage | 142 acre-ft |
| Normal Storage | 60 acre-ft |
| Surface Area | 6 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 160 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Sylvia Lake Country Club |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 07/29/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WA00115 |
| Federal ID | WA00115 |
| More Info | State Dam Safety Program |