The river supports a sport fishery of considerable recreational 

 value for resident trout. That portion of the stream below the 

 Anderson Ranch dam may have its fishery value adversely affected by 

 power— peaking operations o However, a greatly increased trout sport 

 fishery has been provided by the reservoir area* The South Fork both 

 below and above the Anderson Ranch dam has been of no value to anadrom- 

 ous fish for many years, for the same reasons as previously stated 

 for the main Boise River below the project,, 



2B. Middle Fork . — (Not surveyed in detail,,) The Middle Fork 

 joins the North Fork to form the main Boise River at a point 2h miles 

 above the impassable A r rowrock Dam or approximately Ik miles above the 

 upper end of the reservoir area. The stream is inaccessible and of 

 no present or potential value to anadromous fish. It extends for 

 approximately $0 miles in a mountainous region, and is of considerable 

 value to resident trout, 



2C 8 North Fork , — (Not surveyed in detail.) The North Fork 

 extends for a distance of approximately U5 miles through rugged 

 mountainous terrain from its confluence with the Middle Fork, Its 

 fishery aspects are similar to the Middle Fork, and it is of no 

 present or potential value to anadromous fish, 



3o Owyhee River , — (July 12-18, 19U2; Parkhurst, Inspected at 

 various times j Parkhurst j Gangmark, and Dawson ) The Owyhee River 

 enters the Snake River approximately 380 miles above the mouth It 

 extends for more than l£0 miles, of which the main portion is in 

 Malheur County, Oregon, The headwaters, however, are in Idaho and 

 Nevada, 



The lower 12 miles of the course extends through a flat, fertile 

 valley 1/2 to 5 miles wide and bounded by low, rolling hills having 

 a sparse cover of sage. The valley section is under irrigation, and 

 is utilized intensively for the raising of hay, grain, fruit, and 

 pasture. The stream channel in this section is 130-160 feet wide, 

 but at the time of the survey in July the stream bed was mostly un- 

 covered. The discharge near the mouth was only 1$ c,f ,s. The gradient 

 is slight and the stream bed is heavily silted. There are few shallow 

 riffles, but almost continuous pools. The sparse marginal vegetation 

 affords little stream cover. The water temperature was 7i±,0°F, - 76,0°F, 

 There is no suitable salmon spawning area in this section,, There are 

 several small, unscreened irrigation diversions withdrawing 2-3 c f,s o 



At the upper end of this section where the valley converges into 

 the Owyhee Canyon at a point approximately 12 miles above the mouth 

 there is the "Old Owyhee" irrigation dam and diversion. This loose 

 rock dam is only 2 feet high, and although there is no fishway, it is 

 not a barrier except under low flow conditions. The irrigation canal 

 is 20 feet wide, withdrawing 190 c.f,s at the time of observation in 



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