U.S. Geological Survey

Assessment of the Alluvial Sediments in the Big Thompson River Valley, Colorado

By Adrienne Barnett and Karl J. Ellefsen

U.S. Geological Survey Digital Data Series DDS-066

Version 1.0

The text of this report is presented here in Portable Document Format.
Adobe Acrobat Reader 4.0™ is required to view it.
If you wish to download the latest version of Acrobat Reader free, click here.

To obtain subsurface geologic information about the alluvium in the Big Thompson River Valley, S-wave refraction data were collected along three roads that cross the valley. The refraction data were used to estimate velocities and thickness for a layered-earth model from these models, three cross sections of the river valley were constructed. These cross sections show the thickness and gross stratigraphy of the alluvium.

Report (linked PDF files) (3 MB)

This report summarizes the collection, the processing, and the interpretation of the S-wave refraction data. This report includes two plates. The data itself are not included on this web site. The data are included on a CD-ROM, which can be purchased from the USGS.

USA.gov logo  Take Pride in America button