The North and South Forks each contain some additional spawning 

 area^ but also are subject to low summer f lov/s o 



50. Threemile Creek .— (inspected llarch 24^ ^L^; Ni.elson.) 

 This small stream enters the Columbia about 2 miles above The Dalles, 

 Oregon. Since it becomes completely dry during the summer and fall 

 months it is of no value to salmon. 



51» Fifteenmile Creek . — -(inspected I'Jarch 24, 194-45 Nielsen.) 

 Enters the Columbia 3 miles above The Dalles, Ore^'on. The stream is 

 about 40 miles long^ of vrfiich the lovrer 7?^ miles yras inspected. It 

 was discliarging 60 cfoS., but the flow is reduced to less than 5 

 c.f .So, at the mouth during lov/ \ra.ter stages. This fluctuation in 

 flow greatly limits tne value of the stream to salmon. 



There is a falls 12 feet high at a point I/2 mile above the 

 mouth. This fall is provided with a 5-step concrete fishway, but 

 since the first jump is 3 feet high, it is difficult for salmon to 

 ascend at lovf water stages. 



An abandoned rock and masonry diversion dam 10 feet high is lo- 

 cated 300 yards above the falls . This dam is generally passable 

 around one end except at low-water stages, and could be improved. 



There is a natural cascade about I/4 mile above the dam that is 

 a barrier at Iot/ water stages. 



Although it -vvas reported that a fevr chinook salmon enter this 

 stream under favorable flovj- conditions it is of little present value 

 to salmon. A fevf steelhead may ascend at high water stages and utilize 

 some of the sjswning area in the middle and upper sections. 



.The tributaries to this stream are also subject to the same un- 

 favorable low water conditions in the summer and fall. 



LITrHATURE CITiiD 



Craig, J.. A. and Suomela, A. J« | 



1940 A Survey of the Sandy River and its tributaries, 194-0, with 

 reference to fish management. U. 3, Fish and V/ildlife 

 Service Special Scientific Report No. 14» 20 pp. illus. 



Gleeson; G. W., and Tjferrj'-field, F. 



1936 Industrial and domestic wastes of the Willamette Valley. 

 Erig. Kxp. Sta.j Ore. State Agri. College, Bull. Ser.j, No. 7, 

 65 pp. 



Oregon State Planning Board 



1937 A preliminary survey of industrial pollution of Oregon 

 streams. Special Report to the Governor of the State of 

 Oregon. 28 pp. ICLmec. 



102 



