porting- fish movement, a narrow high opening should be 

 created by either modifying the construction of the head- 

 gate or blocking part of the flow into the canal with baled 

 straw, boards or other suitable material. 



2. It is recommended that holes be filled and brush cover or 

 undercut banks be removed to stimulate a greater number of 

 fish to move to the river. This is especially important for the 

 area immediately behind the headgate. It is of little benefit 

 to stimulate fish to move one or two thousand yards up a 

 canal only to have them find suitable concealment just short 

 of the river. A project of cover removal can be accomplished 

 through the cooperative efforts of both sportsmen and ditch 

 companies. 



Many ditches have two headgates — one at the point of diversion 

 and the other some distance down the canal. The downstream head- 

 gate regulates the flow into the canal proper and surplus water at 

 this point is by-passed back to the river through a blowoff. 



Wherever this condition exists, a third measure to reduce fish 

 losses can be applied. If the upstream headgate and by-pass are 

 opened one or two weeks prior to the irrigation season, some resident 

 fish in the vicinity of the intake structure can be transferred from 

 the intake back to the river downstream from the point of diversion. 



The proposal is based on the finding that approximately 80 percent 

 of the pounds of trout and whitefish lost to the Keughen Canal in 

 1950 moved down the ditch during the high water period, and an 

 even greater percentage (96 percent) was lost to the Low Line Canal 

 in 1951 under similar conditions. 



GATE CCL05ED) 



BLOWOFF*- 



• MAIN bTR-EAM ^m 



— 75 — 



