Coulee City Wastewater Lagoon Cell 4 is an earth dam located in Grant County, Washington, built in 2008. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 15 ft15 ft tall and 2,015 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 Coulee City Wastewater Lagoon Cell 4
Coulee City Wastewater Lagoon Cell 4 is a dam in Grant, Washington. The dam is owned by Coulee City Town Public Works Dept (local government). It impounds the Offstream - Grand Coulee.
The dam stands 15 feet tall and stretches 2,015 feet across, creates a reservoir covering 7 acres, and has a maximum storage capacity of 56 acre-feet. Completed in 2008, 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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 05/11/2022.
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Location
| State | Washington |
| County | Grant |
| River/Stream | Offstream - Grand Coulee |
| Coordinates | 47.60094, -119.29288 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Length | 2,015 ft |
| Year Completed | 2008 (18 years old) |
Storage & Hydraulics
| NID Storage | 56 acre-ft |
| Max Storage | 56 acre-ft |
| Normal Storage | 38 acre-ft |
| Surface Area | 7 acres |
| Max Discharge | 0 cfs |
Ownership & Safety
| Purpose | Other |
| Owner | Coulee City Town Public Works Dept |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/11/2022 |
| Emergency Action Plan | No |
Identifiers
| NID ID | WA01927 |
| Federal ID | WA01927 |
| More Info | State Dam Safety Program |