Fairfield Sewage Equalization Basin - Lagoon 2 is an earth dam located in Spokane County, Washington, built in 1966. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 12 ft12 ft tall and 650 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 Fairfield Sewage Equalization Basin - Lagoon 2
Fairfield Sewage Equalization Basin - Lagoon 2 is a dam in Spokane, Washington. The dam is owned by Fairfield City (local government). It impounds the Rattler Run Creek-offstream near Fairfield.
The dam stands 12 feet tall and stretches 650 feet across, creates a reservoir covering 6 acres, has a maximum storage capacity of 18 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1966, the structure is well into its service life at over 50 years old.
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 09/22/2021.
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Location
| State | Washington |
| County | Spokane |
| Nearest City | Fairfield |
| River/Stream | Rattler Run Creek-offstream |
| Coordinates | 47.39909, -117.17260 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 12 ft |
| Dam Length | 650 ft |
| Year Completed | 1966 (60 years old) |
Storage & Hydraulics
| NID Storage | 18 acre-ft |
| Max Storage | 18 acre-ft |
| Normal Storage | 13 acre-ft |
| Surface Area | 6 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Other |
| Owner | Fairfield City |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 09/22/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WA01528 |
| Federal ID | WA01528 |
| More Info | State Dam Safety Program |