Aldarra Pond Dfr1 is an earth dam located in King County, Washington, built in 2001. It carries a Low hazard potential classification.
Dam profile
NID height · 15 ft15 ft tall and 1,100 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 Aldarra Pond Dfr1
The primary purpose of Aldarra Pond Dfr1 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 The Members Club at Aldarra (private). It impounds the Patterson Creek - Offstream.
The dam stands 15 feet tall and stretches 1,100 feet across, creates a reservoir covering 3 acres, and has a maximum storage capacity of 53 acre-feet. Completed in 2001, the structure is relatively new.
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 08/28/2000. That was over 26 years ago.
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Location
| State | Washington |
| County | King |
| River/Stream | Patterson Creek - Offstream |
| Coordinates | 47.58777, -121.95440 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Length | 1,100 ft |
| Year Completed | 2001 (25 years old) |
Storage & Hydraulics
| NID Storage | 53 acre-ft |
| Max Storage | 53 acre-ft |
| Normal Storage | 1 acre-ft |
| Surface Area | 3 acres |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | The Members Club at Aldarra |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 08/28/2000 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WA01818 |
| Federal ID | WA01818 |
| More Info | State Dam Safety Program |