Lock floor ready for concrete

Photograph showing the reinforcing rods in the lock floor in the foreground. The structure in the background is used to deliver concrete from the mixing plant to the bottom of the pit.
Abstract/Description: Photograph showing the reinforcing rods in the lock floor in the foreground. The structure in the background is used to deliver concrete from the mixing plant to the bottom of the pit.
Subject(s): Boats and boating
Soo Locks (Mich.)
Date Created: 1912 (approximate)