This bridge is a Bascule Bridge built in 1930 by Boston Bridge Works of Boston, MA.
How it Works
Originally the bridge had a tender, who controlled a motor to move the gears that in turn moved the concrete weight and lifted the bridge. The bridge operated similar to a see-saw, as indicated by it’s name (Bascule is French for see-saw).
Things to Notice
This bridge has different spans, some that are stationary and others that at one time moved. The bridge originally had a large concrete block in the rectangle above the bridge called an overhead counterweight.