Field measures of gravel quality in the South Platte River north of Denver,
Colorado: a pilot study,
U. S. Geological Survey Open-File Report 97-451,
by David A. Lindsey and John F. Shary
This report identifies field measures of aggregate quality and sampling
procedures for modeling and assessing alluvial gravel deposits in the Front
Range Urban Corridor, Colorado. Measures of particle size, lithology, shape,
and roundness of gravel in lateral bars of the South Platte River are
presented and statistically analyzed.  Optimal sample design for mapping
aggregate quality within drainages and at scales of typical gravel mining
operations is discussed. The accompanying file OF97-451.pdf is in Portable
Document Format (PDF) and requires Adobe Acrobat ReaderTM (v. 3.0 or later)
for viewing and printing. Acrobat Reader can be downloaded free from
<http://www.adobe.com/prodindex/acrobat/main.html>.