and lovr falls . Lbre than half ol' the stream bed is composed of 

 large rubble. There are some patcl'.es of suitable spamiing area 

 sufficient to acconmodatc about /+00 Chinook spavmers. No salmon 

 were seen or reixirted. 



25BE-(15). Tumble bug Creek .— (July 8, 1938; Langton.) Enters 

 the Middle Fork of iJ'illamette approxiciatel;/ 67 miles above the 

 mouth. The stream is about 7 miles long, of which the lovrer mile 

 was Surveyed. It was about 20 feet wide and dis cliarg ing about 20 

 c.f.s. The stream covirse extends through a densely vrooded canyon 

 in a high, inaccessible, mountainous area. The stream flov/s over 

 an impassable series of lov/ falls, cascades, and log jams. A 10 

 foot high vraterfall about 1/2 mile above the mouth, and a 6-foot 

 falls through a log jam about 1 mile upstream were both impassable 

 to fish. Tumblebug Creek is of no possible value to salmon. 



25FF. Coast P3rk, Willamette River .— (ifay 23 - June 20, 193^; 

 Hanavan, Parkhurst, 'torton. Wilding, and Langton.) The Coast Fork 

 joins the Middle Fork to form the main »i'illamette River at a point 

 /^ miles above the city of Ijugene, Oregon, or approximately 189 miles 

 above the mouth. 



The river is approximately 50 miles long, of which the lower 42 

 miles were surveyed. It is formed in the hills of the Coast Range, 

 and floT/s in a general northerly direction. The lower 30 miles ex- 

 tends through a wide, flat, cultivated valley, flanked by low, roll- 

 ing hills. The remainder of the stream is in a narrow valley in 

 tijiibered, mountainous country. In the lower section the river is 

 55-200 feet wide, and has a slight gradient. In the upper 20 miles 

 the stream is less than 50 feet v/ide, and has a moderate to fairly 

 steep gradient. U. S. Geological Survey gage readings taken at a 

 station 18 miles above the mouth, and belov/ Row River and the town 

 of Cottage Grove show a maximum discharge of 30,600 c.f.s., on 

 December 30, 1942, and a minimuxii disctiarge of 7 c.f.s. on July 21, 

 1938. Tlie high water period normally occurs between January and 

 April witli flo;vs up to 6,000 c.f.s. The summer lov; flov^s generally 

 occur in August, and are usually not lower than 60 c.f.s. The flow 

 is now regulated by the nev/ Cottage Grove Dam 72 feet high, built by 

 the IJ. 3. Corj3s of Engineers in 1942 for flood control and other 

 purposes . 



The water temperature ranged frnm 60" - 65° F., in the lo;ver 

 32 miles, and v/as 52° F., at Black Butte Fork, /+3 miles upstream. 



Twenty-tvro miles above the mouth and just above the town of 

 Cottage Grove there is a concrete diversion dam 7 feet high for a 

 flour mill. It has a poor fish ladder v^hich was not operating at 

 the time of observation. This dam was considered a barrier to fish 

 except at high vrater. There is a 5-foot high dam located 1/2 mile 

 farther upstream. ^ wide do-v/nstream apron renders this dam a barrier 



