Amy Bisson shared this photo and post with us yesterday:
About a year ago, there was a rumor that this section of the Riverwalk was to be completed. What seems to be missing are the railings, but there are possibly other structural features needed to make this section of the walk safe for pedestrians. A 2014 article in the Lowell Sun outlines this a bit more.
As it is now, it is more of an attractive nuisance for fence jumpers who want to take a shortcut under the Bridge Street Bridge.