Water flume at Marquette, Michigan.

Locks at Sault Sainte Marie, Michigan.

Water discharge at Victoria Mine, an abandoned copper mine in the Upper Peninsula of Michigan.

Logging locomotive in Upper Peninsula, Michigan.

Locks at Sault Sainte Marie, Michigan.

Water discharge at Victoria Mine, an abandoned copper mine in the Upper Peninsula of Michigan.

Ship in the locks at Sault Sainte Marie, Michigan.

Imperoyal Sarnia going through the locks at Sault Ste. Marie.

Glacial action on rock in Marquette, Michigan.

High Bridge spanning the Kentucky River from the Dix River.

D.J. Angus and friends aboard the Shawnee on the Kentucky River at Lockport, Kentucky.

Dix Dam, completed in 1927, was constructed across the Dix River three miles upstream from its confluence with the Kentucky River. It was the world's largest stone-filled dam.