The first bridge is Wisconsin Avenue, the one that this bridge replaced. The overhead poles carry the catenary for streetcars. Note the skew angle, more on that later.
The next bridge is the Michigan Street Bridge, replaced in 1978, followed by Clybourn Street, that bridge was replaced in 1968.
The one in the far distance carried Buffalo Street. That bridge was removed in the early 1970's and was not replaced. The bridge lives on, though, in scenes of a movie entitled Gaily, Gaily from 1969, in scenes shot using the bridge as a background.
Photo from the Milwaukee Public Museum Collection, used with permission.