The Owyhee River system once supported a good run of Chinook 

 salmon. However, many factors contributed to the depletion of this 

 run, in common with the runs in other tributaries of the Snake River, 

 long before the Owyhee Dam was constructed. 



Although it is not heavily fished, the Owyhee reservoir has a 

 considerable sport fishery value for both resident trout and warm 

 water species, such as bass. 



In addition to more than 100 miles of the main stream above Owyhee 

 reservoir, there are a number of upper major tributaries having a 

 total stream length of more than U00 miles entering above the reservoir, 

 many of which also support resident trout populations. In upstream 

 order the principal tributaries are 3A. Crooked Creek , 51 miles long, 

 entering 82 miles above the dam, 3B .Jordan Creek , Tf miles long, enter- 

 ing 89 miles above the dam, 3C.the South Fork , 90 miles long, entering 

 approximately 126 miles above the dam, and which in turn has several 

 large tributaries, including 3C-(1) the East Fork, 72 miles long, and 

 3C-(2) the Little Owyhee River , k3 miles long. The South Fork, 

 Middle Fork, and North Forks come together approximately 126 miles above 

 the dam to form the main stream. 3D. the Middle Fork , 18 miles long, and 

 3E. the North Fork , 2U miles long, are both much smaller than the South 

 Fork . 



There are a number of small streams entering the Snake River up- 

 stream from the mouth of the Owyhee River. None of them is of value 

 to anadromous fish, and it is considered that they do not warrant a 

 detailed survey Below Swan Falls several small streams enter the 

 Snake River from the southwest. Proceeding upstream above the Owyhee 

 River, the first of these are U. Sucker Creek and £• Jump Creek , both 

 used for irrigation between the towns of Homedale and Marsing, Idaho, 

 In the canyon section below Swan Falls there enters 6* Squaw Creek , 

 7, Reynolds Creek, and 8, Rabbit Creek , None of these is passable to 

 anadromous fish, 9, Sinker Creek enters the Swan Falls reservoir, and 

 is used for irrigation! 10. Castle Creek enters the Snake River a short 

 distance above Swan Falls reservoir, and is utilized for irrigation, 

 11. Birch Creek and 12, Shoo Fly Creek are small streams entering below 

 and above. the town of Grand View, Idaho. Both are used for irrigation 

 in the lower portions of their courses. 



13. Bruneau River ,— (Not surveyed in detail.) Enters the Snake 

 River 8 miles upstream from the town of Grand View, The Bruneau was 

 formerly a fair sized stream, but it is now utilized extensively for 

 irrigation, and is of no value to anadromous fish. Gaging station 

 records taken by the U.S. Geological Survey at a station 1 mile above the 

 mouth and 0,8 mile downstream from the Grand View irrigation diversion 

 dam show mean flows for the water year 19h6-li7 ranging from 629 c.f .s, 

 in May to U,6 c,f .s, in September, ^here are several reservoirs and 

 numerous unscreened irrigation diversions in the Bruneau River system. 



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