Aerial photographs of the Lower Illinois River Basin (LIRB) were taken
from a remote-controlled (R/C) helicopter with a camera suspended from a
remote-controlled camera rig. This was done to document the shape of LIRB
study unit stream reaches and to document and quantify the amount of woody
debris in the stream reaches. Woody debris is important because it
influences the flow of water, which affects the shape of the stream.
Woody debris also provides a habitat for fish and benthic
macroinvertebrates that are used as indicator species of water quality.
Personnel to contact about a specific subject are listed on the staff page.
U.S. Department of the Interior
U.S. Geological Survey
221 North Broadway, Urbana, IL 61801, USA
Last modified: 16:59 CST Wed 17 May 2000