The discharge at the lower end of the valley was about 53 c.f.s., 

 and the water temperature was 6U Fo The gradient is slight for 

 the most part, having an average rise of 12 feet per mile* There 

 are few shallow riffles, but pools are almost continuous o The 

 stream bed is composed chiefly of mediian and small rubble, with 

 a heavy layer of mud and silt. There is no suitable salmon spawn- 

 ing area except for a small amount in the upper ij miles, where 

 the gradient becomes moderate and there is less silt. There are 

 11 irrigation ditches, with a total water diversion of slightly 

 more than 56 Cof«s» 



Section (6) - Unity Valley and headwaters : 



Unity Dam is located at the narrow, upper end of the Hereford 

 Valley, The dam was built by the U. S, Bureau of Reclamation in 

 order to provide a water storage reservoir to supplement the irriga- 

 tion of lands along Burnt River, Its construction was begun in 1936 

 and was completed in 1939, when the operation and maintenance of the 

 project was turned over to the Burnt River Irrigation District, The 

 dam has a height of 76 feet above the stream channel, and a crest 

 length of 69U feeto It is of the earth embankment type, with the 

 spillway and outlet works constructed of concrete. The spillway is 

 an open rectangular chute controlled by two large radial gates. The 

 outlet works consist of a tunnel 7§ feet in diameter and 620 feet 

 long, gate controlled, and protected at the submerged inlet by an 

 iron grizzly. This tunnel is impassable to any fish seeking to 

 migrate farther upstream. At the time of observation in the latter 

 part of June, 19U2, the discharge at the dam was from 89 c,f,So to 

 87 c,f,s. No fishways are provided, and the dam is a total barrier 

 to the upstream passage of fish. The reservoir has a capacity of 25,UOO 

 acre feet, and a surface area of 925 acres. It is subject to consider- 

 able variation in water level. At the time of the survey in September, 

 I9UI, the reservoir was ?2 feet below the high water level. At high 

 water stages it extends for a mile or more above the original mouths 

 of the principal tributaries. 



All the tributaries to Burnt River entering below Unity Dam 

 are small, intermittent, and of no possible value to saL-non, These 

 include 7A Durbin Creek, 7B Marble Greek, 7C Dixie Creek, 7D Damen 

 Jet Creek, 7E Chicken Creek, 7E-(1) Sisley Creek, 7F Shirttail Creek, 

 7G Swayze Creek, 7G-(1) Manning Creek, 7H Durkee Creek, 71 Alder Creek, 

 7I-(1) Lawrence Creek, 7 J Powell Creek, 7K Deer Creek, 7L Dark Canyon 

 Creek, 7M Clarks Creek, 7N Auburn Creek, 7-0 Mill Creek, 7P Pine Creek, 

 7Q Independence Creek, 7R Big Creek, 7R-(l) Cow Creek, and 7S Camp 

 Creek, 



7T, Job Creek , — (September 27> 19hl; Parkhurst and Ziramer,) 

 Job Creek enters Unity Reservoir approximately a mile above the dam. 

 It is a small stream, about 7 rniles ling. It has 6 small irrigation 

 ditches diverting a total of about lOg- cf.s,, which is practically 

 the entire flow. Job Creek is of no possible value to salmon. 



87 



