Click Relander2017-11-052017-11-05196019602002-850-240http://hdl.handle.net/20.500.11867/2008Aerial view of first cofferdam built during construction of John Day Dam.7.5x 8 inchesPhotographIN COPYRIGHT This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).Dams--John Day;Dams; Hydroelectric power plants--Columbia River Basin;