The Great Western Sugar Company (subsidiary of the Great Western United Corporation) operates a sugar beet processing mill at Greeley, Colorado, on the Cache la Poudre River just upstream of its confluence with the South Platte River. Inadequately treated industrial wastes from this mill are discharged to the Cache la Poudre River. In addition to these discharges, a large volume of inadequately treated municipal wastes is discharged immediately upstream of the Great Western mill. Stream surveys were conducted by the National Field Investigations Center - Denver (EPA) during the months of September and December 1971, to define conditions in the receiving waters prior to and during the sugar beet processing season. The report summarizes the results of these investigations.