there is an impassable series of steep cascades and low 

 falls extending for a distance of a half mile above the terminus 

 of the survey. 



The lower portion of the South Fork formerly supported a 

 good run of Chinook salmon, and still has good potential value as a 

 salmon producer. The area above the Grimes Pass dam is of slight 

 potential value. The entire stream is now inaccessible to migratory 

 fish, 



3H-(1). Middle Fork . Payette River .— (August 23-2U, 1938j 

 Hanavan and Wilding,) The Middle Fork enters the South Fork of the 

 Payette approximately 7 miles above the mouth. The stream is about 

 UO miles long, of which 32 miles were surveyed. It is of little 

 possible value to salmon above the terminus <mf the survey because 

 of the steep gradient and lack of spawning area. Near the mouth 

 the stream was about $0 feet wide and discharging about 150 c»f,s. 

 The water temperature ranged from 70,0 F. at the mouth to 58,0 F, 

 at the terminus of the survey. The gradient is slight to moderate, 

 and increases upstream. Some good spawning area was found in the 

 upper 22 miles of the portion surveyed. Floods have deposited 

 Isirge amounts of sand and silt throughout much of the stream bed, 

 thus damaging many former good spawning areas. There were 89,000 

 square yards of suitable spawning area, constituting approximately 

 9 ^percent of the total bottom in the portion surveyed. The Middle 

 Fork was reported to have formerly supported a large run of Chinook 

 salmon, and it still has good potential value as a salmon producer, 

 ^he entire stream is now inaccessible to migratory fish, 



3H-(l)a, Silver Creek,— (August 31, 1938; Parkhurst and 

 Morton.) Silver Creek enters the Middle Fork of the Payette 

 approximately 18 miles above the mouth. The stream is about l5 

 miles long, of which 9z miles were surveyed. It is of no possible 

 value to salmon above the terminus of the survey because of its 

 small size and steep gradient. The stream was 25 feet wide at the 

 mouth, discharging about 50 c,f .s,, and the water temperature was 

 58,0 F, The gradient is moderate to steep, and there is only 1,000 

 square yards of siiitable spawning area, constituting approximately 

 one percent of the total bottom in the portion svirveyed. Several 

 beaver dams and log Jams were found to be impassable at low water. 

 It was r eported that a few Chinook salmon formerly entered Silver 

 Creek, but the streaa was considered to be of little potential value 

 to salmon. The entire stream is now inaccessible to migratory fish, 



3H-(2). Deadwood River , — (August 29, 1938j Hanavan, Parkhurst, 

 Wilding, and Morton, ) The Deadwood River enters the South Fork of the 

 Payette approximately 30 miles above the mouth. It is about UO miles 

 long, of which lii miles were surveyed. The stream was about 100 feet 

 wide Just above the mouth, and gaging-station records taken at this 

 point (U,S,G,S,,1939) show a discharge of 193 c,f,s, on the date of the 



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