go LuoKiamute Riva r 



Wo eviderice of pollution was found in either the Luckiamute or 

 Little L'uckiamute River drpinRp;e3o 



ho Rickreall Crsek 



Ths City of Dallas apparently seriously pollutes Rickreall Creek 

 as evidenoed by an extrr'smelj^ high BODj, a marked increase in conductivityg 

 and a decreased DO, obtained below Dallas on each of the two sunreys^ 

 Rickreall Creek is not gaged but it is believed that the flows observed 

 during both surveys v/ere considerably above the minimum seasonal flowo 



Pollution of Rickreall Creek would constitute a resident fish 

 problem primarily as migratory fishes apparentljr only occasionally 

 enter this streejTio 



Dimick and Merryfieid (1945) reported a DO of 2o2 parts per 

 million obtained on September 6, 1944;, in the lower reach of Rickreall 



Creek o 



io Santiam River Basin 



Pollution of sufficient intensity to affect fish life was not 

 present in the Santiam River Basin at the time of this survey. A 

 marked rise in both BOD and conductivityj with an accompanying '3rop 

 in DO, was found immediately below the City of Lebanon on the South 

 San-biamn These observations tend to confirm those by Dimick and 

 Tforryfie'! '^ (1945) that extremely serious pollution does exist in the 

 lower reach of tine South Santiam during low water stages as a result 

 of indue tz'ial and domestic wastes added at Lebanono A DO of 8.3 ppm 

 was recorded at Crabtree Bridge, 10 miles below Lebanon, on September 

 3O5 1948., Dim.icic and Merryfield reported a 0,0 DO obtained at the 

 sane stntrlon on September 8„ 1944. 



jo Y&mnill River Basin 



No evidence of seriouts pollution was found in the Yamhill Basin 

 except for the reach of the South Yamhill betv/een McMinnville and the 

 forebay of Govemnent Looks on the mam Yamhillo 



The 4o9 ppm DO concentration found in the South Yamhill below 

 McMinnville on September 22, 1948, when the river f lovr was approximately 

 45 cffl, is indicative of a DO depression to about 1 ppm at the lovr" 

 water stages of about 25 cf s o This indication of severe pollution 

 agrees vri th the findings of Dimick and Merryfield who reported a 4.0 

 ppm DO concentration obtained near the mouth of the Yamhill on August 

 23, 1944. 



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