Survey tower in the Straits of Mackinac (4 of 5)

This is survey tower No. 1 of the seven throughout the Straits of Mackinac area.  Some were in the lake as is this one while others were on land (mainland and island).  Sign noting "NO MOORING OF ANY CRAFT AT THIS TOWER. Was to protect the integrity and accuracy of the survey operation.  Boats were not allowed to tough., Electronic reproduction of photograph.  The Mackinac Bridge 1954 - 1958. Mackinac Bridge Authority
Abstract/Description: This is survey tower No. 1 of the seven throughout the Straits of Mackinac area. Some were in the lake as is this one while others were on land (mainland and island). Sign noting "NO MOORING OF ANY CRAFT AT THIS TOWER. Was to protect the integrity and accuracy of the survey operation. Boats were not allowed to tough.
Subject(s): Bridges--Design and construction
St. Ignace (Mich.)
Mackinaw City (Mich.)
Mackinac Bridge (Mich.)
Date Created: 1954 (approximate)