Aggregate plant for lock construction (3 of 3)

Photograph of an aggregate plant, set up in preparation for mixing concrete used to pour piers, walls and floor of the Davis Lock.
Abstract/Description: Photograph of an aggregate plant, set up in preparation for mixing concrete used to pour piers, walls and floor of the Davis Lock.
Subject(s): Boats and boating
Soo Locks (Mich.)
Date Created: 1912 (approximate)