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Surface Water Management Division
Library
- Aquatic Habitat Restoration & Salmon Recovery
- River Flood Hazard Management
- Septic System Outreach Pilot Program
- Urban Drainage Infrastructure
- Water Quality Management
- Watershed Plans
- Drainage Inventory Maps
- Fish Distribution
- Marine Resource Maps
- Water Quality Monitoring
- Countywide Watersheds and Lakes
- Lake Washington Watershed
- Puget Sound Watershed
- Skagit Watershed
- Stillaguamish Watershed
- Snohomish Watershed
- Watershed Management Areas/Clean Water District
- Drainage Inventory Maps - search by geography
- Groundwater Data - search by geography
- Geographic search for countywide water quality data
- Interactive Culvert Inventory Map - search by geography
- Real-time Flood Warning Information for Snohomish County rivers
- Watersheds of Snohomish County
- Drainage Inventory Maps - search by geography
- Geographic search for countywide water quality data
- Groundwater Data - search by geography
- Groundwater Quality and Well Data
- Hydrology Data including stream-flow collected every 15 minutes to 2 hours from streams and rivers around the county Lake Quality Data from lakes around the county
- Real-time Flood Warning Information for Snohomish County rivers. Updated every 15 minutes.
- Water Quality Data from streams and rivers around the county
The Fine Print
This website contains downloadable materials produced by Snohomish County government in the course of its official duties. Snohomish County disclaims any warranty of merchantability or warranty of fitness of these materials for any particular purpose, either express or implied. No representation or warranty is made concerning the accuracy, currency, completeness or quality of data depicted. Any user of these materials assumes all responsibility for use thereof, and further agrees to hold Snohomish County harmless from and against any damage, loss, or liability arising from any use of the material.
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