Exit embouchures, Soo Locks

Photograph showing the mouths of three of the outflow tunnels in the left foreground and cement being delivered to the inside of the middle tunnel.
Abstract/Description: Photograph showing the mouths of three of the outflow tunnels in the left foreground and cement being delivered to the inside of the middle tunnel.
Subject(s): Boats and boating
Soo Locks (Mich.)
Date Created: 1912 (approximate)