Here are two photos of the LaGrande Aqueduct taken in LaGrande, Wash., in 1915.
In the first photo you can actually see people at the top.
Rich Williams, “The water was diverted at LaGrande Dam, and the flume ran down the west side of the river and crossed the LeGrande Canyon vie this pipeline. The pipeline ended up at the headworks reservoir in LaGrande.”
Photos courtesy of Pat Van Eaton.
Click on images to enlarge.