I405 Coal Creek Stormwater Detention Da
I405 Coal Creek Stormwater Detention Da is an earth dam located in King County, Washington, built in 1987. It carries a Low hazard potential classification.
About I405 Coal Creek Stormwater Detention Da
The primary purpose of I405 Coal Creek Stormwater Detention Da 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 Bellevue City Utilities Dept (local government). It impounds the Coal Creek near Newport Shores.
The dam stands 31 feet tall, creates a reservoir covering 1 acres, and has a maximum storage capacity of 40 acre-feet. Completed in 1987, the structure is 39 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 | King |
| Nearest City | Newport Shores |
| River/Stream | Coal Creek |
| Coordinates | 47.56656, -122.18036 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 31 ft |
| Year Completed | 1987 (39 years old) |
Storage & Hydraulics
| NID Storage | 40 acre-ft |
| Max Storage | 40 acre-ft |
| Normal Storage | 1 acre-ft |
| Surface Area | 1 acres |
| Max Discharge | 1,000 cfs |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Bellevue City Utilities Dept |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WA01647 |
| Federal ID | WA01647 |
| More Info | State Dam Safety Program |