Close-up of forms for lock construction (2 of 2)

Photograph showing a view of forms used to create the water transfer tunnels beneath the floor of the lock. At top center appear two of the large movable forms used to pour the lock wall (in sections).
Abstract/Description: Photograph showing a view of forms used to create the water transfer tunnels beneath the floor of the lock. At top center appear two of the large movable forms used to pour the lock wall (in sections).
Subject(s): Boats and boating
Soo Locks (Mich.)
Date Created: 1911 (approximate)