There are numerous other low irrigation dams on the Lemhi 

 River, These are all passable to fish, most of them being temporary 

 •wing dams. Most of the diversions are small. Measurements were 

 taken on 2k of the irrigation ditches, which were withdrawing a 

 total of lii3 c,f,s. There are no fish screens on any of the water 

 diversions from this stream. 



At the terminus of the survey -Uie Lemhi River is formed by 

 the union of several small streams, namely IF-(3) Canyon Creek, IF-CU) 

 Eighteenmile Creek, and IF-(5) Texas Creek, The discharge of each of 

 these headwater streams was approximately 2 c.f .s,, and they were con- 

 sidered to be of little value to salmon because of their small size. 



The Lemhi River formerly supported an excellent run of 

 Chinook salmon. The U. S, Fisheries Station at Salmon, Idaho conduct- 

 ed the artificial propagation of Chinook salmon on the Lemhi River 

 during the years 1920-1933, but despite this effort the run has been 

 depleted. No salmon were seen during the survey. The stream is of 

 little value as a salmon producer at present, but it has great poten- 

 tial value, 



IF-(l), Wimpey Creek , — (July 1, 19Ul; Zimmer,) Wimpey Creek 

 enters the Lemhi River approximately 12^ miles above the mouth. The 

 stream is about 8 miles long, of which about l|^ miles were surveyed* 

 Near the mouth it was k2 feet wide and discharging about 75 c,f .s. 

 The gradient is moderate in the lower 3 miles, becoming steep above, 

 ■'■he lower 1/2 mile contains a high concentration of excellent spavn>- 

 ing gravel. There were 3,800 sq. yi9, of sui -table spawning area, 

 constituting approximately 2I4 percent of the total bottom in the 

 portion surveyed. The stream formerly supported a good rxin of Chinook 

 salmon, but it has been greatly depleted. No salqjon were seen during 

 the survey. Although Wimpey Creek has been adversely affected by 

 obstructions and diversions in the Lemhi River, it has 8(XQe potential 

 value for salmon, 



IF-(2), Hayden Creek , — (inspected July 8, 19Ulj Parkhurst and 

 Zimmer.) Hayden Creek enters the Lemhi River approximately 33 Tniles 

 above the mouth. The stream is about 20 miles long. Near the mou^bh 

 it was 27 feet iride, discharging about 60 c,f ,s,, and the water 

 temperature was 57«0°F» The gradient is fairly steep throughotrt. 

 The stream bed is composed chiefly of large rubble, and there is little 

 suitable spa'wning area, Hayden Creek was considered to be of slight 

 ■value to salmon, 



IG, Pahsimeroi River ,— (July 9, 19Ulj Parkhurst and Zimmer,) 

 The Pahsimeroi River enters ■the Salmon River 18 miles below Challls, 

 Idaho, or approximately 29$ miles above the mouth. The stream is 

 about 30 miles long, of irtiich about 27 miles were surveyed. It was 

 too small ■bo be of possible value to salmon above ■the terminus of 



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