APPENDIX I 



COPY October 8, 1945 



Memorandum 



To? F. M. Lewis 



Subject; Fishway Observation 



There has recently been constructed an inspection chamber or diving bell 

 for use in observing aouatic conditions in the fishway system» 



Completion of the chamber was too late to make as thorough a study as 

 might be desirable, but did give certain desirable information. 



!• It was the consensus of the opinion that fish are not being injured 

 passing through underwater orifices. Although there appears to be a fairly 

 rapid velocity which reouires some effort on the part of the fish to get 

 through, it in no way taxes their capacity. 



2. Fish do, at times, rub the top and sides of orifice, but several different 

 observers agree they saw no fish passing through which, in their opinion, rubbed 

 hard enough to be injiired. From my own personal observation, I am not prepared 

 to say definitely that fish are not, in some instances, injured. But for 

 reasons other than injuries, I am of the opinion that underwater orifices are 

 of no help to the fish. 



3« The first setting of chamber was just upstream of Weir 55. This weir 

 forms the lower end of stilling pool below counting station. Visibility varied 

 during observation from excellent to fair. During the time of best visibility 

 conditions, fish were very numerous, and could readily be ob^served as far 

 as 15'-0" feet away. Water conditions could hardly be improved upon in this 

 pool. As thousands were passing up the ladder, it was possible to observe 

 their general condition and actions. 



The opinion of all observers is that fish, upon reacning this pool, are in- 

 clined to take it easy, probably resting. They are in TlO apparent hurry and 

 in contrast to those fish seen on the surface of the pool, those in the lower 

 depths are remarkably calm and lazyo They displayed no concern over chamber, 

 and many were curious enough to i-jmain within inches of the windows for consid- 

 erable periods of time. 



4» Diver's underwater lights (1000 Watts) were used at times to light up the 

 area adjacent to the orifice and chamber. The fish were in no way disturbed. 

 Some even appeared to be fascinated by the lights and remained under the lights 

 for minutes at a time. This would tend to disprove the idea that fish will not 



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