Belfair Wwtp Treated Water Storage Pond
Belfair Wwtp Treated Water Storage Pond is an earth dam located in Mason County, Washington, built in 2014. It carries a High hazard potential classification and has a poor condition assessment.
About Belfair Wwtp Treated Water Storage Pond
Belfair Wwtp Treated Water Storage Pond is a dam in Mason, Washington. The dam is owned by Mason County (local government). It impounds the Coulter Creek.
The dam stands 22 feet tall and stretches 1,700 feet across, creates a reservoir covering 14 acres, has a maximum storage capacity of 209 acre-feet, and collects water from a drainage area of 12 square miles. Completed in 2014, the structure is relatively new.
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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. An emergency action plan is in place for this dam. The most recent inspection on record was 05/27/2022.
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 | Mason |
| River/Stream | Coulter Creek |
| Coordinates | 47.44538, -122.81226 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 22 ft |
| Dam Length | 1,700 ft |
| Year Completed | 2014 (12 years old) |
Storage & Hydraulics
| NID Storage | 209 acre-ft |
| Max Storage | 209 acre-ft |
| Normal Storage | 159 acre-ft |
| Surface Area | 14 acres |
| Drainage Area | 12 sq mi |
| Max Discharge | 139 cfs |
Ownership & Safety
| Purpose | Other |
| Owner | Mason County |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Poor |
| Last Inspection | 05/27/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WA00728 |
| Federal ID | WA00728 |
| More Info | State Dam Safety Program |