Getting Started: 1933-1938
1936. Cofferdam. You can see how the cofferdam clears a portion of the riverbed for excavation.
Contact
Grand Coulee Visitor Center
(509) 633-9265
pninfo@usbr.gov
Columbia River Basin in Idaho, Oregon, Washington,
Montana & Wyoming
1936. Cofferdam. You can see how the cofferdam clears a portion of the riverbed for excavation.
Contact
Grand Coulee Visitor Center
(509) 633-9265
pninfo@usbr.gov