Chemical and physical data were collected at six and biological data at five sites on the Boise River between Veterans Memorial Parkway in Boise and Star, Idaho, from October to December 1987. Data were collected to determine the impact of sewage effluent from two Boise wastewater treatment plants on the water and biological quality of the Boise River. Similar data will be collected from January to March 1988 and will be published in a second noninterpretive report. Results of all data analyses will be discussed in a final interpretive report. (USGS)