Kennewick Sewage Lagoon System
Kennewick Sewage Lagoon System is an earth dam located in Benton County, Washington, built in 1997. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Kennewick Sewage Lagoon System
Kennewick Sewage Lagoon System is a dam in Benton, Washington. The dam is owned by Kennewick City Public Works (local government). It impounds the Offstream-columbia near Kennewick.
The dam stands 24 feet tall, creates a reservoir covering 1 acres, has a maximum storage capacity of 286 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1997, the structure is 29 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. An emergency action plan is in place for this dam. The most recent inspection on record was 03/23/2016. That was 10 years ago — unusually long for a high-hazard dam, which typically requires more frequent inspections.
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 | Benton |
| Nearest City | Kennewick |
| River/Stream | Offstream-columbia |
| Coordinates | 46.21024, -119.09999 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 24 ft |
| Year Completed | 1997 (29 years old) |
Storage & Hydraulics
| NID Storage | 286 acre-ft |
| Max Storage | 286 acre-ft |
| Normal Storage | 246 acre-ft |
| Surface Area | 1 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 50 cfs |
Ownership & Safety
| Purpose | Other |
| Owner | Kennewick City Public Works |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 03/23/2016 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WA01769 |
| Federal ID | WA01769 |
| More Info | State Dam Safety Program |