This 1976 structure is not likely to be the first bridge at this location. Rather, there was likely a structure from the 1910 to 1930 era in place. That bridge was probably a narrow one-lane bridge, possibly a through truss structure. If anyone knows for sure, please let me know. At any rate, that structure would have been obsolete in about 40 years, leading to the construction of the current bridge.
The new Highway T bridge is a modern pre-stressed concrete girder bridge with a concrete deck. To save time, money, and materials, a rather basic metal rail was installed rather than a safer concrete railing. The metal rail is simply bolted into the bridge deck. The downside is that it allows bridge runoff and debris to end up in the river. One very interesting feature of this bridge is that it was built on a curve in the road with a curve in the bridge. Despite the bridge having a curve, the girders are straight and do not have a curved shape.
The photo above is a view looking down the length of the bridge deck towards the southeast from the center line on the north end of the structure.