Connell Wastewater Lagoon 4 is an earth dam located in Franklin County, Washington, built in 2009. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 10 ft10 ft tall and 1,470 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 Connell Wastewater Lagoon 4
Connell Wastewater Lagoon 4 is a dam in Franklin, Washington. The dam is owned by Connell City (local government). It impounds the Esquatzel Coulee-tr, Os near Connell.
The dam stands 10 feet tall and stretches 1,470 feet across, creates a reservoir covering 10 acres, has a maximum storage capacity of 107 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 2009, the structure is relatively new.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 07/17/2024.
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Location
| State | Washington |
| County | Franklin |
| Nearest City | Connell |
| River/Stream | Esquatzel Coulee-tr, Os |
| Coordinates | 46.68982, -118.84504 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 10 ft |
| Dam Length | 1,470 ft |
| Year Completed | 2009 (17 years old) |
Storage & Hydraulics
| NID Storage | 107 acre-ft |
| Max Storage | 107 acre-ft |
| Normal Storage | 81 acre-ft |
| Surface Area | 10 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Other |
| Owner | Connell City |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 07/17/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WA00710 |
| Federal ID | WA00710 |
| More Info | State Dam Safety Program |