Overburden removal during Mackinac Bridge construction (1 of 2)

cranes using clam buckets remove overburden from inside of caisson 18.  Overburden in the form of rock, sand, and mud was deposited outside the caisson.  Note the pipe discharging water in the center of the photo.  This "Air Lift" was used as a vacuum to remove the fine materials., Electronic reproduction of photograph.  The Mackinac Bridge 1954 - 1958. Mackinac Bridge Authority
Abstract/Description: cranes using clam buckets remove overburden from inside of caisson 18. Overburden in the form of rock, sand, and mud was deposited outside the caisson. Note the pipe discharging water in the center of the photo. This "Air Lift" was used as a vacuum to remove the fine materials.
Subject(s): Bridges--Design and construction
St. Ignace (Mich.)
Mackinaw City (Mich.)
Mackinac Bridge (Mich.)
Date Created: 1954 (approximate)