Lahars

Lahar Inundation Areas

Using two USGS 30 meter DEM's, the rivers shown here were extrapolated using a few tools in ArcMap's Spatial Analyst extension. These rivers can then be used to locate potential lahar inundation areas and as a tool in hazard assessment.

Lahar Hazard Assessment

This map identifies at risk population by US Census block groups and schools within a half mile of streams and rivers located on Mt Hood. In the event of a volcanic event, these areas have the highest probability of being impacted by lahars.