25S-(3)» South Santian River . — (Lower 35 miles survej'Bd August 

 L,-^ ., 19/4.0; Frey and Zinner. Next 292 miles survevBd September 15-17; 

 Ilanavan, Kolloen, Baltzo, and Lobell.; Joins the North Pork to form 

 the main Santiam River 11 miles above the mouth. The river is 85 miles 

 long, of Tz-hich the lower 64^=- miles were surve^/ed. The flow at Waterloo, 

 24. miles upstream, and above the principal diversions, ranges from a 

 minimum of 96 c.f.s., nn September 1-2, 19A0, to 70,000 c.f.s., on 

 Larch 31, 1931. The average yearly discharge is 2,652 c.f.s. The flow 

 from July through October is usually less tlian 500 c.f.s. The water 

 temperature ranged from 55° - 66° F., vrith one reading of 74-° F-, at 

 the mouth of Crabtree Creek. The gradient is slight in the lower 25 

 miles, moderate in the next 30 miles, and steeper in the upper section. 



There is a paper mill diversion dam 4- feet high at the towi:i of 

 Lebanon, 19 miles above the mouth. This dam is equipped Tritii a fish- 

 way which was nearly dry and impassable at the tine of the survey. 

 The diversion is unscreened except for a trash rack. Between the diver- 

 sion take-off at the dan and the return 500 yards belov; the river channel 

 was practically dry. Part of the diverted ivater does not return to the 

 Santiam, but flows into the Albany Ditch. From the diversion return to 

 the mouth of the river the stream was highly polluted -v/ith paper mill 

 waste and serfage from the toivn of Lebanon. The v/ater in tnis section 

 was dark and foul and the stream bed vras covered v;ith a scum of gelati- 

 nous material. A chemical analysis of the vrater taken at a point 9 

 miles above the mouth indicated no dissolved oxygen present. Numerous 

 dead rough fish littered the shore. 



Tliere is a 9-foot high concrete povrer and irrigation diversion 

 aan located about 2-g miles farther upstream. The dam was equipped 

 with a f ishvray which was nearly dry and impassable at the time of the 

 survej'-. The power company, working in coojjeration 7;-ith the Oregon 

 Fish Commission and Game Conmission, recently has completed a new con- 

 crete fislTV'/ay over this dam. The diversion canal, knovm as the Lebanon 

 Ditch, v;as carrying 160 c.f.s., but withdravre at tines a maximum of 34-6 

 c.f.s. Most of this diversion is not returned to the Santiam, but flov;s 

 into the Albany Ditch leading to the Mountain States Power Company plant 

 near the mouth of the Calapooj^a River at Albany. 



There is a series of low falls 3-6 feet high 4-3 to 4.5 miles above 

 the mouth, and a 5-foot falls 54^ miles above the mouth. These falls 

 are very difficult or impassable at low v/ater. There is an impassable 

 falls 64 miles above the nouth and another, 20 feet in height, 65 miles 

 upstream, at which point the survey was terminated. 



There is sjoa-vming area for about 20,000 salnon in the South Fork 

 above Lebanon. Apparently the major part of the present run spavms 35 

 to 65 miles above the nouth. in the ;^^'ar 1937, 237 spring chinooks 

 were observed Si)awning above the toivn of Sweet Home, and numerous redds 

 indicated the presence of many uncounted fish. Fortunately, a sufficient 



53 



