BUREAU OF FISHEKIES §3 



or rendered inaccessible, (4) the sources of pollution, (5) the num- 

 fisheS rfirthri «^^r^'^g-^tion canals and tlleir effect on migratory 

 fhVir 'piif the location o± natural and artificial obstructions and 

 their effect as barriers to upstream migration, and (7) the general 

 status of the salmon populations in the river 'system. Most ^of the 

 tributaries of the Columbia River in eastern Washington and a few 



Grand Coulee Dam counting weirs have been established ii/two 



at t lie ^nrTff ^'^ n" '^'\ '^'™ ""^^ ?^'''''''' ^'^''^ been stationed 

 at the Rock Island Dam to count the fish passing these points 



Hdderf .t Z R^t'l f V"n'^^^™^ '^^'^'''^' ^^^^ ^^^ ^w^o fish 

 Jaddeis at the Rock Island Dam are inadequate to provide free 



fhri^Z''^^ "'fT\ '''^^"^ '\^'^^ ^^^^ h^^^-^^' ^'^ recommendation of 



he Bureau of Fisheries, a third fish ladder has been constructed 



m time to care for the summer migrants of 1936 ^iLiciea 



Rit^r'^^fntn^ \^l """^'T ^'T^''' f ^^- the protection of the Columbia 

 been emriZl'fn '^^^^icted as a separate project, the Bureau has 

 been engaged for over 2 years m an intensive study of the require- 

 ments of fish protection at the Bonneville Dam on the lower Coliim- 

 aid thTsH^i fi't''' T^^^^-'-^tion with the United States engineers 

 and the htate fish and game departments. Detailed designs of 

 fish protection works, embodying an improved type of gravity fish 

 ladder and hydraulic lifts or locks, have been prepared and forma 



19SrTf/i'''''1 ^''^1 '"'^""f ^^^ .^^ '^' ^^^^ Department in Aug" s 

 thP .1 ^l prolonged consideration, the War Department approved 



purmg the fiscal year just closed, in addition to completino- 



rfvinf "^r^"' '"^^"''^ "? '^'' ^'""''^^ Pl^" ^^^d rendering expert 

 advice and supervision during their construction, the Bureau's staff 

 has been mamly concerned with devising temporary fishways to 

 afford free passage to migrating salmon during the period of con 

 struction of he main dam and powerhouse. In the course of tMs 

 work many difficulties arose froii unusual flood stages oTtLrivr 

 and plans have been altered frequently and temporarily expedients 



ihe' mi ; o? f "'' r' ^'""rr^ ^^'^^"^^.^ P^'^^^^^^^^ ^as b'^en Soi cM 

 the runs of migratmg fish during the spring months, and more 



eligteers.'" ''''^' "'"'"^'^^ ^'"' ^'''' adopted^ the Uni?ec5 States 



SOCKEYE-SALMON TREATY 



After almost 40 years of consideration and discussion, a treatv for 

 the protection of the sockeye salmon of Fraser River w^s ratified by 

 vllY" '^ States Senate on June 15, 1936, with certain reservat ons 

 which are believed to be acceptable to Canadian interests This 

 treaty signed m 1930 and ratified by Canada in the same year pro! 

 vides for an international fisheries commission of six member^ 'three 

 on the part of the United States and three on the par of Canada 

 The commission is charged with the duty of making extensive inves- 

 tigations of the natural history of sockeye-salmon runs to Frl'er 



