YMCA at Indianapolis, Indiana.

Quarry in Bedford, Indiana.

Paddleboat at the locks on the Kentucky River at Frankfort, Kentucky.

Paddleboat at the locks on the Kentucky River at Frankfort, Kentucky.

Paddleboat at the locks on the Kentucky River at Frankfort, Kentucky.

Locks on the Kentucky River at Frankfort, Kentucky.

Locks on the Kentucky River at Frankfort, Kentucky.

D.J. Angus and friends on board the Shawnee paddleboat on the Kentucky River.

Powerhouse for 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.

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.

Locks on the Kentucky River at Frankfort, Kentucky.

High Bridge spanning the Kentucky River from the Dix River.

D.J. Angus and friends boarding the Shawnee on the Kentucky River.

Powerhouse for 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.

High Bridge spanning the Kentucky River.

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.

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

High Bridge spanning the Kentucky River from the Dix River.

Glacial action on rock in Marquette, Michigan.

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

Ship in the locks at Sault Sainte Marie, Michigan.

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

Locks at Sault Sainte Marie, Michigan.

Logging locomotive in Upper Peninsula, Michigan.