Uo So Coast and Geodetic Survey charts for the Columbia River 

 from Vsncouver, Washington, to The Dalles, Oregon have been reproduced 

 in Figures 8 and 9, and have been marked off in 1-mile sections from 

 The Dalles, Oregon, to Lyle, Washington, and from Bonneville Dam to 

 Cape Horn, Washington. The numerals in the circles refer to the 

 numbers of dead fish found in each 1-mile seotiono Only fish found 

 in 1946 during the period of the fall run are included in the figures 

 encirclede Figure 8 also includes 21 dead salmon and steelhead trout 

 which were picked up just below the spillway section on September 6 

 and October 3, 1946. 



Dea d Fish Above Bonneville o It was decided to conduct the same 

 intensive sef rch for dead fish above Bonneville Dam as below in order 

 to compare the rate of mortality of fish that had passed over Bonneville 

 Dam with those that had not surmounted the ladders. Accordingly, obser- 

 vers were stationed at The Dalles, Oregon, from September 10 to 19, 

 inclusiveo With the aid of a power boat, these men made a search for 

 dead fish between The Dalles, Oregon, and Lyle, Washington. The section 

 of river near The Dalles is roughly the same distance below Celilo Falls, 

 a natural barrier, as Cepe Horn is belov/ Bonneville Dam, an artificial 

 structure. Figure 9 shows the distribution of the fish found. 



Table 8 shown that in 81-1/2 hours of observations 93 dead salmon 

 and steelhead were found. On September 23, the boat returned to the 

 dam. En route to the dam 11 dead chinook salmon jf9te found dviring 5 

 hours of obeorvation» 



Table 8. Number of dead chinook salmon and steelhead trout seen 

 floating in the Columbia River in the vicinity between 

 The Dalles, Oregon, and Lyle, Washington, (approximately 

 13 miles belov; Celilo Falls) during the period September 

 10-20, 1946. 



1/ The average number of dead chinook salmon seen per hoxxr during this 

 period was 1.018, and the average number of dead steelhead trout seen 

 per hour was 0.123} the average for both species was 1.41 per hour. This 

 would average 27.4 fish per day. During this period approximately 15 

 sturgeon fishermen were fishing between Celilo Palls and the point of 

 observation. However, most, if not all, of these men used lamprey or 

 smelt for bait. 



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