This object  is an old bridge pier belonging to a pedestrian bridge to the tram line that used to run on Kavanaugh (nee' Prospect Avenue). It is over 100 years old, constructed beginning in 1903.
Given the structure's historical significance, status as a cultural resource, and location in a naturally wooded (not urban) area, painted graffiti is considered vandalism. Arguably, should not be considered art. Suggest the feature be changed to bridge support, ruins.