lC-(3)d. Trail Creek .— (June 20, I9I1I5 Bryant.) Trail Creek 

 enters Loon Creek approximately 2k miles above the mouth. The stream 

 is about 6^ miles long, of which the lower 2 miles were surveyed. It 

 was 12 feet wide near the mouth, and was discharging about 2^ c,f .s. 

 The gradient is fairly steep. There were only $00 square yards of 

 suitable spawning area, cpnstituting approximately 12 percent of the 

 total bottom in the portion surveyed. An impassable beaver dam was 

 found 950 yards above the mouth, and there are numerous other beaver 

 dams throughout the stream. Two small, unscreened irrigation ditches 

 were observed, each diverting 3-5 c.f.s. No salmon were reported 

 to enter Trail Creek, and probably no run exists. The stream could 

 not be of more than slight value to salmon, 



lC-(3)e Pioneer Creek , — (Jime 20, 19Ulj Frey.) Pioneer Creek 

 enters Loon Creek approximately 2$^ miles above the mouth, above an 

 impassable beaver dam on Loon Creek, The stream was therefore entirely 

 inaccessible to migratory fish. It is about 6 miles long, of which the 

 lower mile was surveyed. The stream was of no possible value to salmon 

 above the tenninus of the survey because of the increasingly steep 

 gradient. It was 21 ft, wide at the mouth and discharging about 35 c,f,s. 

 There were only 250 square yards of suitable spawning area, constituting 

 approximately 3 percent of the total bottom in the portion surveyed. 

 Pioneer Creek is of no present value and of practically no potential 

 value to salmon, 



IC-(U), Little Loon Creek , — (July 9, 19Ulj Frey and Bryant,) 

 Little Loon Creek enters the Middle Fork approximately 55^ miles above the 

 mouth. The stream is about 11 miles long, of which the lower 3 miles 

 were surveyed, up to a series of beaver dams forming an impassable 

 barrier to fish. Near the mouth it was 12 feet wide, discharging about 

 25 cf.s,, and the water temperatiure was U7»0 F, The gradient is 

 fairly steep in the lower 3 miles and increases upstream. There were 

 3,600 square yards of suitable spawning area, constituting approximately 

 16 percent of the total bottom in the portion surveyed » A falls 6 feet 

 in height is located at the mouth and is probably a barrier at low 

 water. Numerous beaver dams were found in the section surveyed, ren- 

 dering the passage of fish extremely difficult. The U. S, Forest 

 Service reported that Little Loon Creek formerly supported a small run 

 of Chinook salmon before the infliix of beavers in recent years. No 

 salmon were seen dxiring the survey, and it is doubtful if any enter at 

 present. The stream has some potential value for a small salmon popu- 

 lation, 



lC-($), Marble Creek .— (July 11, I9UI; Frey and Bryant.) Marble 

 Creek enters the Middle Fork approximately 63 miles above the mouth. The 

 stream is about 2U miles long, of which the lower 11 miles were surveyed. 

 Near the mouth it was U2 feet wide, discharging between 125 and l50 c.f.s,, 

 and the water temperature was 52,0 F, The gradient is fairly steep, and 



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