Radar Lake Dam
Radar Lake Dam is an earth dam located in King County, Washington, built in 1973. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Radar Lake Dam
The primary purpose of Radar Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Radar Lake Holding Trust (private). It impounds the Tr-bear Creek near Redmond.
The dam stands 34 feet tall and stretches 2,500 feet across, creates a reservoir covering 44 acres, has a maximum storage capacity of 90 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1973, the structure is well into its service life at over 50 years old.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. Notably, no emergency action plan is currently on file for this high-hazard dam. The most recent inspection on record was 08/06/2019.
At 34 feet, this dam is taller than 80% of dams nationwide.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Washington dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Washington |
| County | King |
| Nearest City | Redmond |
| River/Stream | Tr-bear Creek |
| Coordinates | 47.73051, -122.02417 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 34 ft |
| Dam Length | 2,500 ft |
| Year Completed | 1973 (53 years old) |
Storage & Hydraulics
| NID Storage | 90 acre-ft |
| Max Storage | 90 acre-ft |
| Normal Storage | 68 acre-ft |
| Surface Area | 44 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 5 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Radar Lake Holding Trust |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/06/2019 |
| Emergency Action Plan | No |
Identifiers
| NID ID | WA00186 |
| Federal ID | WA00186 |
| More Info | State Dam Safety Program |