Washington Geologic Information Portal - Volcanic Hazards (USGS)
Washington (regional), United States, Year unknown
Washington Department of Natural Resources. Geologic Information Portal.
This map was produced by an official agency, but may not be the most recent, most complete, or main operational map.
For the current operational hazard map, please consult the proper institutional authorities.

Click on image for full-size map. If link seems broken, try the archived version.