Rock Creek Dam

On the North Fork of the Feather River, California. The highway to the left is California SR 70; the railroad on the right is the old Western Pacific line ("the Feather River route"), now part of the Union Pacific and still in use. Unlike the Middle Fork, the North Fork is definitely a "harnessed" river, with a chain of hydropower structures extending all along it from about here to the head of Lake Oroville. The construction dates from the early-mid 20th century, and of course thoroughly trashed the original salmon run--but such things weren't much of a consideration back then.
Telephoto view from the Three Lakes access road well above the canyon; the location is of the dam itself rather than the photo point.