Snohomish County Online Government Information & Services  Snohomish County > Public Works > Surface Water Management
Drainage Inventory Maps
Updated once a month
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Drainage Inventory Map Browser
Data collected by Surface Water Management, Snohomish County Public Works. Data and field observations reflect drainage conditions at the time of data collection. Data should not be used for final engineering designs. This Map Browser includes data collected as part of the Drainage Needs Report Project.
Click on a highlighted area in the map to go to a Township view
Areas highlighted in yellow are Townships that have available drainage maps. Click on the area you are interested in to find the maps. The maps have a topographical contours background. Drainage maps are recreated once a month using our most up-to-date, quality-controlled data.

Last Update: December 11, 2009