34 U. S. BUREAU OF FISHERIES 
points are located 5, 25, and 45 miles, respectively, from the mouth 
of the Columbia. 
During these operations 2,357 chinooks were tagged and liberated, 
of which 743, or 31.5 percent, were recovered from the commercial 
fishery, sport fishery, hatchery, and from the spawning grounds. 
The recovery from hatcheries was 48 tags, or 2.04 percent. 
Information was obtained on the distribution of the spring chinook 
run in the tributaries of the Columbia, indicating that fish entering 
the river in the month of May are destined for tributaries in the 
Upper Columbia, Snake River, and Willamette River systems. 
The results of this experiment will be included in a report which is 
being prepared for publication. 
Construction of fish protective works.—On the 1st of July com- 
bination grants of P. W. A. and W. P. A. funds were made available 
for the construction of fish screens and other fish-protection works 
on certain Federal power and irrigation projects. These allotments 
authorized the expenditure of $50,000 in each of the States of Oregon, 
Washington, and Idaho, and $118,000 for the construction of one 
fish screen in the Wapato Canal of the United States Indian Service 
near Yakima, Wash., and one screen in the power canal of the United 
States Reclamation Service near Prosser, Wash. Surveys have been 
made and plans drawn for screens at the Wapato Canal, Prosser 
Canal, and Black Canyon Dam diversion of the Reclamation Service 
in Idaho, remodeling of screens in the Sunnyside Canal near Yakima, 
Wash., and construction of a screen in the Echo Feed Canal of the 
Reclamation Service on the Umatilla River in Oregon, as well as for 
several small projects in the State of Washington. Contracts have 
been let and work started on the construction of the steel screen drums 
for the above-mentioned projects. A contract has been made and 
work is well advanced on the concrete structure for the Wapato 
Canal screens. Excavation work has been going forward at the 
Black Canyon Dam site and at the Sunnyside Canal and considerable 
concrete and steel work has been done as well at Sunnyside. Con- 
crete structures will be built at the remaining sites when the work 
can be done at the lowest cost and with the least interference with 
canal operations. This work has been done under the supervision 
of J. A. Craig and O. W. Lindgren, associate hydraulic engineer. 
Special surveys.—An observer was stationed at the dam across the 
Clearwater River at Lewiston, Idaho, from late spring until late fall 
to observe the condition of the runs of migratory fish passing that 
point. It was found that a significant run of steelhead trout still 
enters the stream, but that salmon are no longer numerous in that 
watershed. Lack of adequate fishways is apparently the reason for 
this condition and the owners of the dam have drawn plans for two 
new fishways and the remodeling of the present single structure. 
As soon as this construction is completed, several hundred miles of 
spawning grounds will be made available again to salmon. Collec- 
tion and tabulation of statistical data relating to catch records and 
abundance of salmon and steelheads of the river were continued. 
COHO SALMON 
The coho salmon investigation, the basic objectives of which are 
a study of the life history of this species under the varying conditions 
