average width of 60 feet in the section surveyed. The survey was con- 

 ducted at extreme low water stage, when more than half of the stream 

 bed was dry. The run-off is rapid and of short duration, the stream 

 exhibiting great fluctuation in water level. The water temperature 

 ranged from 76°F near the mouth to 70 F at the upper terminrs of the 

 survey. The gradient is slight in the lower section, end becomes 

 moderate to steep above. There were approximately h.0,000 sq,yd, of 

 suitable spawning area, constituting 8 percent of the total bottom 

 in the section surveyed* However, the entire stream bed was covered 

 with a layer of silt and algae, which together with the high wator 

 temperatures and other adverse factors causes the stream to be un- 

 suitable for salmon. No salmon were seen or reported. The upper 

 section may be of some value to steelhead and resident trout, 



9B, North Fork, Clearwater River . — (Sept, 19-0ct, 3, 1938} 

 Hanavan, Parkhurst, Wilding, and Morton,) The North Fork enters the 

 Clearwater River approximately U3 miles above the mouth. The 3tream 

 is about 135 miles long, of which the lower 110 miles were surveyed* 

 Above the terminus of the survey it is of little potential value to 

 salmon because of the steep gradient. The width of the stream ranged 

 from approximately UOO feet at the mouth to about 100 feet at the 

 mouth of Kelly Creek, the terminus of the survey. The discharge at 

 the time of the survey ranged from about 1,000 c*f*s* at the mouth 

 to 200 c,f,s, just above the mouth of Kelly Creek, Gaging station 

 records for the years 1926 to 19U8, taken at a station near Ahsahka, 

 Idaho, 2 miles above the mouth, show discharges ranging from a maxi- 

 mum flood of 100,000 c,f ,s, in December, 1933> to a minimum of less 

 than 250 c,f*s, in January, 1937, The average discharge for a 19 

 year period (1926-19U5) was £,liUt c,f,s,, according to U.S. Geological 

 Survey records. The water temperature ranged from about 65°F. in the 

 lower section of the river to 5»2°F. in the headwaters. The gradient 

 is moderate for the most part, and becomes fairly steep in the upper 

 section. There are numerous good shallow riffle areas and adequate 

 resting pools well distributed throughout the course* Factors that 

 greatly reduce the potential value of the stream for salmon include 

 the large amount of bedrock in the stream bed, especially above the 

 confluence of the Little North Fork, and the large amount of sand in 

 the lower portion of the river* There were approximately 2^0,000 

 sq. yd, of suitable spawning area constituting 2\ percent of the total 

 bottom in the section surveyed. 



There was a log jam 1,200 yards long about 20 miles above the 

 mouth which was a barrier at low water. Above this point there were 

 two smaller log jams, likewise impassable at low water. These jams 

 develop each summer as a result of the method of logging. They are 

 removed at high water, when the accumulated logs are floated downstream. 

 There are no permanent barriers to the migration of fish. 



The North Fork formerly supported a large run of chinook 

 salmon. This run has been greatly depleted for many years, and is 

 now practically exterminated. No salmon were seen or reported during 

 the survey, A small spring run of steelhead trout was reported. The 

 river is of little value at present as a salmon producer, but it has 



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