Silver Lake Dam is an earth dam located in Cowlitz County, Washington, built in 1971. It carries a Low hazard potential classification.
Dam profile
NID height · 15 ft15 ft tall. 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 Silver Lake Dam
The primary purpose of Silver Lake Dam is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Silver Lake Flood Control Dist. (local government). It impounds the Outlet Creek near Castle Rock.
The dam stands 15 feet tall, creates a reservoir covering 2,300 acres, has a maximum storage capacity of 11,737 acre-feet, and collects water from a drainage area of 39 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.
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Location
| State | Washington |
| County | Cowlitz |
| Nearest City | Castle Rock |
| River/Stream | Outlet Creek |
| Coordinates | 46.30333, -122.74568 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Year Completed | 1971 (55 years old) |
Storage & Hydraulics
| NID Storage | 11,737 acre-ft |
| Max Storage | 11,737 acre-ft |
| Normal Storage | 7,500 acre-ft |
| Surface Area | 2,300 acres |
| Drainage Area | 39 sq mi |
| Max Discharge | 1,783 cfs |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Silver Lake Flood Control Dist. |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WA00142 |
| Federal ID | WA00142 |
| More Info | State Dam Safety Program |