Surface Water Management Division

Downloadable GIS Data

Drainage Inventory GIS Data

In December of 2002, a team of Snohomish County staff and consultants completed a study that inventoried existing drainage systems and evaluated stormwater drainage problems and solutions in the County's rapidly growing urban growth areas (UGAs).

Using Global Positioning Systems (GPS), an inventory of 73 square miles of existing drainage systems were mapped (includes 15 square miles of inventory conducted prior to the DNR project and 58 square miles of inventory conducted during the DNR project).

Disclaimer: Data collected by Snohomish County Public Works, Surface Water Management Division. Data and field observations reflect drainage conditions at the time of data collection. Data should not be used for final engineering designs.

SWMInventory.zip - Comprehensive drainage inventory collected by SWM and Road Maintenance.  Includes data collected by the Drainage Needs Report Surface Water Management effort and on-going efforts. This file also includes the Field procedures used in collection of the inventory data in PDF format and the data dictionary. Shapefiles have the following abbreviations for data type: catchbas (catch Basins); drainpt (Drainage Feature); xsection (Cross Sections); network (Drainage Network). All metadata is in HTML format.

Contact

Gi-Choul Ahn, Senior GIS Analyst - Water Resources, 425-388-3464 ext. 4621.