Connell Wastewater Lagoon 1a 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 · 23 ft23 ft tall and 790 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 1a
Connell Wastewater Lagoon 1a 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 23 feet tall and stretches 790 feet across, creates a reservoir covering 2 acres, and has a maximum storage capacity of 17 acre-feet. 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 | 46.69263, -118.84599 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 23 ft |
| Dam Length | 790 ft |
| Year Completed | 2009 (17 years old) |
Storage & Hydraulics
| NID Storage | 17 acre-ft |
| Max Storage | 17 acre-ft |
| Normal Storage | 13 acre-ft |
| Surface Area | 2 acres |
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 | WA01913 |
| Federal ID | WA01913 |
| More Info | State Dam Safety Program |