THE INFLUENCE OF EXTRINSIC FACTORS ON SEDIMENTATION RATES AND
SEDIMENT TYPES IN THE CATFISH CREEK WATERSHED, DUBUQUE, IOWA.  

Robert Duffy.   Environmental Sciences Program, University of
Dubuque, 2000 University Avenue, Dubuque, IA 52001.  

The watershed of Catfish Creek, a tributary of the Mississippi
River, near Dubuque, Iowa, encompasses both urban/suburban and
rural areas.  We are interested in analyzing the influence of
such activities as subdivision construction and development,
agricultural practices, commercial development, industrial, and
other activities, on the types and volumes of sediments entering
into the watershed.  Sediment cores were taken at locations above
and below designated activities and were typed as to mineral
content.  Integrated sediment samples were also taken at the
designated sites and correlated with concurrent streamflows.  

Keywords:  Catfish Creek, sediments, industrial, residential,
agricultural, commercial