Snohomish Sewage Lagoon
Snohomish Sewage Lagoon is an earth dam located in Snohomish County, Washington, built in 1958. It carries a Low hazard potential classification.
About Snohomish Sewage Lagoon
Snohomish Sewage Lagoon is a dam in Snohomish, Washington. The dam is owned by Snohomish City (local government). It impounds the Snohomish River-offstream near Everett.
The dam stands 11 feet tall and stretches 5,000 feet across, creates a reservoir covering 120 acres, has a maximum storage capacity of 400 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1958, the structure is well into its service life at over 50 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life.
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Location
| State | Washington |
| County | Snohomish |
| Nearest City | Everett |
| River/Stream | Snohomish River-offstream |
| Coordinates | 47.91302, -122.11442 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 11 ft |
| Dam Length | 5,000 ft |
| Year Completed | 1958 (68 years old) |
Storage & Hydraulics
| NID Storage | 400 acre-ft |
| Max Storage | 400 acre-ft |
| Normal Storage | 120 acre-ft |
| Surface Area | 120 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 615 cfs |
Ownership & Safety
| Purpose | Other |
| Owner | Snohomish City |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WA00539 |
| Federal ID | WA00539 |
| More Info | State Dam Safety Program |