Workmen on forms during lock construction

Photograph showing workmen waiting for concrete atop forms. The reinforcing rods are curved above the subfloor passageways used for emptying and filling the lock.
Abstract/Description: Photograph showing workmen waiting for concrete atop forms. The reinforcing rods are curved above the subfloor passageways used for emptying and filling the lock.
Subject(s): Boats and boating
Soo Locks (Mich.)
Date Created: 1912 (approximate)