b e Middle Fork Willamette Basin 



No evidence of serious pollution was found in the Middle Fork 

 Willamette Basino As might be expectedj, a gradual rise in both BOD 

 and conductivity developed progressively dovmstream, but neither 

 approached the borderline of significant pollutiono 



Co McKenzie River Basin 



No evidence of serious pollution was found in the McKenzie River 

 drainage . 



do Long Tom River Basin 



Water discharged from the Fern Ridge Reservoir exhibited a 

 relatively high BOD indicating that oxygen-consuming decomposition 

 within the reservoir had not yet reached the state of complete oxygen 

 satisfactions Aeration and dilution (indicated by the increasing 

 conductivity) in the next six miles downstream reduced the BOD and 

 increased the DOo The sharp rise in BOD and conductivity at the town 

 of Monroe indicated an increase in pollutionj presumably by domestic 

 sewage, at that pointo There is no evidence that the pollution burden 

 added at the toTm of Monroe would prove of serious consequence even 

 during low watero The Long Tom River on September 14 (date of first 

 survey) was flowing 37 cfs. at Monroe in comparison vdth a normal 

 season minimum of about 25 cfs. at this point. 



eo Calapooya River 



No evidence of a serious pollution was found in the Calapooya 

 River—at least above the city limits of Albany. The Calapooya was, 

 at the time of the survey, well above minimum stage— -a flow of 219 cfs. 

 being reported at Albany on October 15 (one week after the survey) in 

 comparison with a normal seasonal minimum flow of approximately 20 cfs. 

 Merryfield and Wilmot (1945) stated "o » .the Calapooya shows evidence 

 of severe contaminationo** 



fo Marys River 



No evidence of pollution of sufficient intensity to affect fish 

 life was found in Marys River except in the reach between the Chapman 

 Mill Dam and the City of Corvallis, The intervening "dry stretch** of 

 the Marys apparently is seriously polluted during the summer months 

 probably by a combination of organic material accumulating in the 

 pools when high river flov7S provide a spill over the Chapman Dam and 

 domestic sewage entering from Squaw and Oak Creeks. Unfortunately, 

 the slack-water polluted reach of Marys River borders Avery Park, 

 an area of extremely high recreational value in which the city of 

 Corvallis has a considerable investeent in svirimming and boating 

 facilities . 



16 



