nuiaber of salmon are able to pass the critical stream section below 

 Lebanon at high water stages in order to marUitain the present runs in- 

 to tne upper river section and tributaries. However, the fate of many 

 of the downstream migrants is subject to question. Chubs, suckers, and 

 minnows were abundant in the lower and middle sections, and small cut- 

 thr'-"a"G and rainbor;- trout and a fev; vihitefish were observed in the up- 

 per section. None of the tributaries above the confluence of the Mid- 

 dle Fbrk have been surveyed. 



25S-(3)a. Thomas Creek . — -(Lower 18^ miles to Jordan Dam inspected 

 August 18-20, 194.0; Parkhurst and Bryant. Next S-g- miles surveyed 

 September 26-27, 1945; Brev/ington, Davis, and Johanson.) 



Enters the South Santiam 3 miles above the moutli, and is about Ul 

 miles long. Tlie discharge on August 18, 194-0 Tjas about 20 c.f.s., and 

 the v/ater temperature ranged from 67° - 71*^ F. The gradient is slight 

 to moderate (25-4-5 feet per mile)o 



A diversion dam 6 feet high at the town of Scio, 9 miles above the 

 mouth, provides power for a feed mill. The former fishway was im- 

 passable at low vrater, and recently was replaced. The diversion is un- 

 screened. 



The Jordan power dam, located aiiproximately 18^- miles above the 

 mouth, is 15 feet high. The fishv^ay was completely broken down and the 

 dam vras a total barrier at tne time of the survey. However, in recent 

 negotiations between the Mountain States Pov\rer Company and the Oregon 

 Fish Commission and Game Commission, plans have been prepared for a new 

 fishway at this dam. The power diversion amounted to 15 c.f.s., and 

 was returned to the stream at the tailrace of the pov/er plant one mile 

 belov/. The diversion flume is unscreened at the take-off, but there is 

 a 1/2 inch spaced bar screen just above the povrer house. The by-pass 

 at this point was dry. The power plant operates under a 56 foot head 

 at 900 R.P.M. The river channel in the 1-mile section between the dam 

 and the power plant return was practically dry except for isolated pools . 

 The fishway at Jordan Dam recently has been repaired. 



There is a 3-i'oot high dam 2\ miles above Jordan Dam that is a 

 barrier at low vrater, as is a similar structure 1^ miles farther up- 

 stream. 



The lower I6 miles of the stream is heavily silted and the next 

 2-2 miles contain a large amount of bedrock and boulders . There is some 

 spawning area below Jordan Dam, but due to siD.ting, high temperatures ^ 

 and low flov;s it is not utilized by saljnon or trout. There are good 

 spavming areas above Jordan Dam, sufficient to accommodate an estimated 

 4.5OOO salmon in the 8-mile section surveyed. The water temperature in 

 this upper section ranged from 4.9° - 54° F. The present runs of both 

 salmon and steelhead have been greatly depleted. 



54 



