The Old Pioneer Irrigation Diversion Dam is located within the 

 city limits of Baker, about ^ mile south of the city center. This 

 dam is 2 feet high and U5 feet long. There was a good flow over the 

 entire crest, naking the structure passable to fish. The foundation 

 and abutments are of concrete construction, and it is a simple matter 

 to raise the effective height of the dam by the use of stop- logs. It 

 may be a barrier to fish during the irrigation season, when the 

 volume of the diversion is several times greater. The irrigation canal 

 is 18 feet wide, and is fitted with headgates which were limiting the 

 diversion to about 10 Cof,s, 



Above Baker Valley the Powder River extends for a distance of 

 one mile and 2-| miles through two narrow, rocky canyons separated by 

 a small valley U miles long. The discharge was about 120 c,f,So in 

 the lower part of this section, and the water temperature was above 

 70 Fo The gradient is generally moderate, although somewhat less in 

 the valley portion. There are numerous good shallow riffles and ade- 

 quate resting pools. The stream bed is so heaidly silted as a res\xlt 

 of mining activity in the headwaters that the underlying rubble com- 

 position cajinot easily be determined. This condition is so pronoimced 

 that it caused the value of this section for salmon spawning to be 

 heavily discounted. It was estimated that less than 10 percent of the 

 stream bed should be classified as suitable spawning area« 



An irrigation diversion dam is located near the lower end of the 

 canyon where the powder River emerges into Baker Valley, about 2 miles 

 above Baker, or approximately 8? miles above the mouth of the stream. 

 This dam is 1| feet high and 36 feet long. It is probably a barrier to 

 fish during low water. The type of construction is typical of that 

 employed on the Powder River; the foundation and abutments are of 

 concrete, and the height of the dam can easily be changed by the adjust- 

 ment of stojV'logs. The ditch is h feet wide at the headgate, and was 

 withdrawing about 6 c.f ,s. 



The Stewart-Shaw Irrigation Diversion Daii is located near the 

 lower end of a canyon about 7 miles south of Baker, or approximately 92 

 miles above the mouth of the river. This dam is 2 feet high, 36 feet 

 long, and is impassable to fish during low water© Its height can be 

 easily changed. The ditch is about h feet wide at the headgate, and 

 was withdrawing 125 miner's inches, or slightly more than 3 c,f,So It 

 was reported that the average diversion during the irrigation season 

 is 500 miner's inches, or 12f c.f.s. 



The Smith Brothers Irrigation Diversion Dam is located 100 yards 

 above the Stewart-Shaw Dam. This dam is 3 feet high, 39 feet long, 

 and is probably impassable to fish during low water. It is similar 

 in construction to the dams previously described. The diversion canal 

 is 8 feet wide at the headgate, and was withdrawing about 12^ c,f,s. 

 The maximum diversion is 372 c»f«s« 



7$ 



