Center section of Columbia River coffered off and stream diverted west of block 40 shown to right center where section "E" of west cofferdam is partly removed. Frames in lower foreground are feeders for conveyor to be used in removing about 1,350,000 cubic yards of overburden in this section. Rocks projecting through ice rest on river bottom. Upstream is steel piling on river side of crib-type cofferdam.
Dewatering central and eastern portions of the Columbia River after completion of the cross river cofferdam.