Activities in 1954 were of a facility testing 

 nature, and only a limited number of summer- 

 run Chinook salmon were trapped at Bonneville 

 Dam and taken to Carson hatchery. The spring 

 Chinook salmon transplantation program did 

 not actually begin until 1955. 



Trapping and Hauling 



Salmon used in the present study are trapped 

 at Bonneville Dam, located on the Columbia 

 River about 150 miles above the mouth (fig. 1). 

 Trapping facilities are located at the exit of 

 Washington shore fishway (fig. 2). 



from Bonneville Dam to Carson hatchery is 

 approximately 1 hour. 



Data pertaining to trapping operations in 

 period 1955-61 are given in table 1. Numbers 

 of fish hauled in individual loads have varied 

 from 20 to 74, and no noticeable adverse 

 effects could be detected as a result of hauling 

 the larger numbers of fish. Hauling mortalities 

 experienced during each year of operation are 

 given in table 2. On one occasion mechanical 

 failure of the truck resulted in several hours' 

 delay while fish were in transit. No ill effects 

 to the fish were observed. 



Each year, preceding regular operations, a 

 trial run is made of the entire trapping and 

 hauling procedure. This serves as a checking 

 and testing operation for the truck drivers 

 and trap operator, and permits any necessary 

 adjustments to mechanical and electrical func- 

 tions of the trap. After being loaded into the 

 1,000-gallon tank truck, fish are transported 

 to the hatchery, where they are released into a 

 dirt holding pond (fig. 3). Truck travel time 



Water temperatures have not been a problem 

 during hauling operations. Water for the truck 

 tank is provided from Bonneville pool, and for 

 years 1955-61 the temperatures have been in 

 the lower 50° F. During the period of early 

 spring hauling, air temperatures have been 

 low, and no greater than a 2° F. increase 

 in water temperature in the truck tank has 

 occurred while fish were being transferred 

 to the hatchery. 



SCALE OF MILES 



OREGON 



Figure 1.- -Columbia River, Bonneville Dam and vicinity. 



3 



