The orignial dataset contains the street centerline data for Snohomish County. It follows the Washington State NG 911 Model for use in emergency call routing. Any other use of this data is not directly supported by Snohomish County.

This feature class has been exclusively updated by Mukilteo's GIS team since it was first acquired, carefully adjusting centerlines to be more accurate in the area and creating attribute fields that pertain to city operations and interests in Mukilteo and the surrounding areas.