Snohomish Sewage Lagoon dam
Snohomish Sewage Lagoon
Located in Everett, Washington, the Snohomish Sewage Lagoon serves as an essential water resource infrastructure managed by the local government. This lagoon, constructed in 1958, plays a critical role in treating sewage and maintaining water quality in the Snohomish River-Offstream. With a storage capacity of 400 acre-feet and a surface area of 120 acres, the lagoon is designed as an earth dam with a hydraulic height of 11 feet.
The Snohomish Sewage Lagoon is regulated by the Washington Department of Ecology, ensuring compliance with state permitting, inspection, and enforcement requirements. Despite its low hazard potential, the lagoon has not been rated for its overall condition. The facility's emergency action plan status, risk assessment, and risk management measures are currently undocumented, highlighting potential areas for improvement in emergency preparedness and response. As a vital component of the local water infrastructure, ongoing monitoring and maintenance of the Snohomish Sewage Lagoon are essential to safeguarding water resources and mitigating environmental risks in the region.
Dam data reference
Condition Assessment
- Satisfactory
- No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
- Fair
- No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action.
- Poor
- A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency.
- Unsatisfactory
- A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
- Not Rated
- The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Hazard Potential Classification
- High
- Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
- Significant
- Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environmental damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
- Low
- Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
- Undetermined
- Dams for which a downstream hazard potential has not been designated or is not provided.
Plan around the weather
Same NOAA / yr.no feed Snoflo's iOS app uses. Watch the precipitation column on the meteogram -- rain on the basin upstream typically lifts inflow 24-72 hours later.
Next 5 days, hour by hour
Temperature line with weather symbols on top, snow + rain accumulation as columns, humidity as a dotted line.
5-day forecast table
Every 3 hours, broken out across temperature, snow, rain, humidity, and wind. Each cell is colour-coded relative to the column min/max.
| Time | Condition | Temp (°F) | Snow (in) | Rain (in) | Humidity (%) | Wind (mps) | Wind dir |
|---|---|---|---|---|---|---|---|
| Loading detailed forecast… | |||||||
15-day temperature & precipitation
Daily temperatures, snow, and rain projected over the next two weeks.
Nearby streamflow gauges
USGS streamgauges around Snohomish Sewage Lagoon -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Pilchuck River Near Snohomish | 193 cfs | → |
| Snohomish River Near Monroe | 4,150 cfs | → |
| Mission Creek Near Tulalip | 3 cfs | → |
| Tulalip Creek Near Tulalip | 7 cfs | → |
| Sultan River Below Powerplant Near Sultan | 322 cfs | → |
| East Branch Tulalip Creek Nr Mouth Nr Tulalip | 3 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Snohomish Sewage Lagoon.
Boat launches
- City Of Snohomish River Front Trail, Snohomish
- Lowell Riverfont Trail Lowell
- Panther Lake Road Snohomish County
- West Flowing Lake Road 6415, Snohomish
- 123rd Drive Northeast 1709, Lake Stevens
- East Shore Drive Snohomish County
Campgrounds
- Flowing Lake County Park
- Camp Pigott
- Camp Edward Bsa (Boy Scouts Of America)
- Island County Fairgrounds
- Wenberg County Park
- River Meadows County Park
Paddle runs
- Headwaters In Ne1/4 Of Sec 14, T29n, R10e To Confluence With Canyon Creek
- Canyon Creek To Confluence With North Fork Stillaguamish River
- Confluence With Troublesome Creek To Confluence With South Fork Skykomish River
- Confluence Of Tye And Foss Rivers To Gold Bar
- Headwaters In Sw1/4 Of Sec 7, T31n, R9e To Boulder River Wilderness Boundary
- Snoqualmie Falls To Plum's Landing
Track Snohomish Sewage Lagoon in the Snoflo app
Save this dam as a favorite and get the local NOAA / yr.no forecast plus regional flow context wherever you are.
About Snohomish Sewage Lagoon
Where does the data for Snohomish Sewage Lagoon come from?
Structural and regulatory data come from the U.S. Army Corps of Engineers' National Inventory of Dams (NID). Weather forecast comes from NOAA / yr.no -- the same feed Snoflo's iOS app uses.
How often is the report updated?
NID structural data refreshes annually as the Corps publishes updated assessments. The weather forecast refreshes throughout the day.
What does the Low hazard rating mean?
The Corps of Engineers' hazard potential classification grades probable consequences if the dam fails: High = probable loss of human life; Significant = no probable loss of human life but possible economic loss / environmental damage; Low = no probable loss of human life, only minor economic / environmental losses. See the Dam Data Reference card above for the full definitions.
What's "% of normal"?
The current storage value compared to the historical average storage on this calendar day. 100% = right on average; values above 100% mean above-normal storage (wet year); values below mean below-normal (dry year or drought).
Can I get alerts when storage crosses a threshold?
Yes -- alerts are managed in the Snoflo iOS app. Favorite this dam, set a threshold, and you'll get a push the moment conditions cross.
Other water bodies near here
Snoflo-tracked reservoirs and dams within driving distance of Snohomish Sewage Lagoon.