Ravensdale Pit is an earth dam located in King County, Washington, built in 1972. It carries a Low hazard potential classification.
Dam profile
NID height · 18 ft18 ft tall and 2,950 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 Ravensdale Pit
Ravensdale Pit is a dam in King, Washington. The dam is owned by Reserve Silica Corp (private). It impounds the Tr-green River near Ravensdale.
The dam stands 18 feet tall and stretches 2,950 feet across, creates a reservoir covering 17 acres, has a maximum storage capacity of 165 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1972, 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 11/19/1999. That was over 26 years ago.
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Location
| State | Washington |
| County | King |
| Nearest City | Ravensdale |
| River/Stream | Tr-green River |
| Coordinates | 47.35097, -121.99269 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 18 ft |
| Dam Length | 2,950 ft |
| Year Completed | 1972 (54 years old) |
Storage & Hydraulics
| NID Storage | 165 acre-ft |
| Max Storage | 165 acre-ft |
| Normal Storage | 120 acre-ft |
| Surface Area | 17 acres |
| Drainage Area | 1 sq mi |
Ownership & Safety
| Purpose | Other |
| Owner | Reserve Silica Corp |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 11/19/1999 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WA00339 |
| Federal ID | WA00339 |
| More Info | State Dam Safety Program |