mainly a succession of cascades^ lov/ falls, and small pools. Al- 

 though large rubble predominates, there is spavming area available 

 for a few fish. No salmon were seen, but trout were fairly numerous. 



25DD-(17) Horse Creek (August 24-26, 1937, and July 22, 1938j 



Baltzo, Kolloen and Parkliurst.) Enters the McKenzie River Similes 

 above the mouth, and is 22 miles long. The lower 11 miles to Separa- 

 tion Creek, its principal tributary, was surveyed in 1937, and the 

 next U miles to Mosquito Creek was surveyed in 1938. Tlie flow near 

 the mouth was 332 c.f.s., and at the mouth of Roney Creek , 13 miles 

 upstream, was 39 c.f.s. The water temperature was 50-5B°F. The 

 gradient in tne lower 7 miles is moderate, increasing to more than 

 100 feet per mile above. In the lower 2|- miles Horse Creek flovirs 

 through flat bottom lands 2-3 miles wide in an intricate network of 

 cross connecting channels that shift with each high water period. 

 The earth banks are low, and the stream is overhung with a jungle- 

 like growth of trees and brush, affording good shelter for fish. 

 This lower section is flooded during high vrater periods. Multiple 

 channels also occur in the next 3 miles upstream as the valley nar- 

 rows to 1/^-1/2 mile. The upper watershed is a mountainous, vrooded 

 (conifers) section. Above Separation Creek there are many fast 

 riffles and cascades and a high percentage of large rubble. The 

 Forest Service reported that the stream widens in the upper section 

 and originates in a swampy, flat, area containing tvro small lakes. 

 The only barrier found in the stream was an impassable log jam 1 mile 

 above Separation Creek. There are 12-19 good resting pools per mile. 

 There is sufficient spawning area available for several thousand 

 Chinook salmon, but it is little used at present. Seven adult chinooks 

 were seen in 1937 and about 100 in 1938, these fish having escaped from 

 the McKenzie River racks. 



Local residents report that large runs of spring chinooks formerly 

 utilized this stream, f^ir numbers of small rainbow and cutthroat 

 trout were observed. The fishing intensity is moderate, the dense 

 brush rendering much of the stream too difficult to fish. Most of the 

 tributaries except Kings Creek, Separation Creek, and Roney Creek are 

 either too small (less than 3 c.f.s.^ or too steep to be of value to 

 salmon. 



Kings Creek . — Entering 1 mile above the mouth, is L, miles long, 

 had a flov/ of 3 c.f.s., and its lower course in a STrampy flat is diffi- 

 cult to follow. Roney Creek had a flow of 5 c.f.s., and has some good 

 spawning area near the mouth. Pothole and Mosquito Creeks near the 

 upper end of the survey, each had a flow of 10 c.f.s., but are steep 

 and contain little spawning area. 



25DI>-(l7)b. Separation Creek .— (July 21, 1938; Wilding.) Enters 

 Horse Creek 11 miles above the mouth, and is 13 miles long, of which 

 the lower 2|- miles were surveyed. The stream is ^0-50 feet wide at 



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