The avalanche paths are boundaries of historic and active avalanches in the Washington State, primarily in WSDOT’s Northwest and North Central Regions. The avalanche path features also contain an attachment to historic maps and images of the avalanche. If you have questions about the data, please contact John Stimberis at John.Stimberis@wsdot.wa.gov or Harlan Sheppard at Harlan.Sheppard@wsdot.wa.gov.

This data represents a statewide catalogue of avalanche paths. The paths are grouped by geographic regions across State and Federal transportation corridors within Washington. Data consists of individual path polygons and corresponding oblique photos. Attributes include frequency, magnitude, elevations, aspect, terrain characteristics, historical occurrences, and other pertinent information. The data is updated and edited as needed. Ownership is shared by WSDOT Avalanche Forecasters and GIS & Data Systems Groups. Any questions can be directed to WSDOT Regional Avalanche Supervisors in North Central or South Central Regions as well as to HQMaintenanceTechnologyGroup@wsdot.wa.gov.