If you have ever gone to Glen Echo park you have probably noticed the old trolley bridge over Minnehaha creek. It is the big metal bridge you see on your left as you cross the foot bridge. This bridge has been abandoned for decades. The bridge has been rehabilitated and a short section MacArthur Avenue Trail has now been re-routed over it
Here is how it looks below the bridge. You can see the concrete and steel have gotten a fresh coat of paint.
This is how the underside of the bridge looked in May of 2013.
Last year at this time the bridge was totally overgrown. It looks like construction started last July.
Update 2015-04-05: In the comments, Brett Young pointed out that he has a set of pictures taken throughout the construction process.