8. Alpowa Creek . — (April 26, 1937; Suomela and Burrows.) 

 Alpowa Creek enters the Snake River approximately 131 miles above 

 the mouth. The stream is about 22 miles long, of which the lower 

 11 miles were inspected. The stream had an average width of 8 



feet in the section observed, and was flowing about 15 c.f.s. near the 

 mouth at the time of observation. There is often no flow in the 

 lower section during the summer months, due to the diversion of water 

 into several small, unscreened irrigation ditches, and also due to 

 the semi-arid nature of the watershed. The water temperature was 73°F« 

 at a point near the mouth. The gradient is moderate in the lower 

 valley portion of the course, and becomes steep in the upper canyon 

 portion. Riffle areas are found throughout, but pools are lacking 

 in the lower section. There is practically no stream cover in the 

 lower part, and it is sparse in the upper portion. Stream improvement 

 work of deepening and straightening the channel in the lower section 

 for the purpose of flood control has contributed to rendering that 

 part of the stream of no value to fish. The upper section is 

 spring-fed, and never becomes completely dry. It was reported that 

 this section supports a small resident trout population, as well as a 

 small spring run of steelhead. Alpowa Creek is of no present or 

 potential value to salmon. 



8A. Page Creek . — (April 26, 1937; Suomela and Burrows.) Page 

 Creek enters Alpowa Creek about one mile above the mouth. It is a 

 small, intermittent stream, and of no value to migratory fish. 



8B. Powahkee Creek. — (April 26, 1937; Suomela and Burrows.) 

 Powahkee Creek enters Alpowa Creek 3 miles above the mouth. It is a 

 small, intermittent stream, and of no value to migratory fish. 



9. Clearwater River . — See Part 2, page 16 



10. Asotin Creek .— (March 8-10, 1935; Suomela and Christy.) 

 Asotin Creek enters the Snake River approximately ll±6 miles above the 

 mouth. The main stream extends for a distance of about lit§ miles, 

 where it is formed by the confluence of the north and south forks. 

 It was completely surveyed. In March, 1935, the stream had an aver- 

 age width of about 30 feet near the mouth. Gaging station records 

 taken at a point about 10 miles above the mouth indicated a flow of 

 UO c.f.s. on March 10, 1935. Records for the water year 19UU-li5 

 (U.S. Geological Survey) give a maximum flow of 152 c.f.s. in May and 

 a minimum flow of 23 c.f.s. in August. The water temperature at 

 the time of the survey was uniformly Uh°F» The stream gradient is 

 moderate, with numerous good shallow riffles forming extensive 

 spawning areas, and an adequate number of good resting pools well 

 distributed throughout the course. There were estimated to be 

 168,000 sq. yd. of medium and small rubble constituting 79 percent 

 of the total bottom. A large part of this medium and small rubble 

 comprised suitable salmon spawning area. 



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