Figure 9. — Interior of the test flshway at pool 59, showing attached 

 observation chamber. Plexiglass wall panels are 3/4-inch thick. 



Figure 10. — Observation chaniber (A) for viewing passage of fish leaving the 

 fishway through the orifices. Grillwork adjacent to window (B) deflects fish 

 toward observer for better view and also prevents fish from drifting back 

 through orifice after they have passed into the flow introduction pool (fore- 

 ground). 



Observation facilities .-- T wo underwater 

 chambers were provided for observing fish 

 and hydraulic conditions. One chamber was 

 placed adjacent to pools 59 and 60 (fig. 9) 



to inspect the flow patterns and fish move- 

 ment; and the other chamber at weir 60 

 (fig. 10), to observe fish as they passed 

 through the orifices on completing their ascent 



