Erosion survey high on north flank of Mount St. Helens.

Erosion survey high on north flank of Mount St. Helens....

Detailed Description

Holding a prism, a geologist assists on a survey of the area above Loowit Falls to quantify erosional changes that affect stream hydrology. View is to the north, with Spirit Lake in the background.

Details

Image Dimensions: 900 x 661

Date Taken: