This bridge is a late night hangout for the underage hipsters of Allston. The graffiti is rather charming, but the copious amounts of broken glass and bottle-ends is becoming a hazard for children and cyclists. This bridge either needs a debris sweep daily or more security overnight.
Update: I spoke to a gentleman at MassDot who actually achieved some headway - the bridge is currently clean! If the situation devolves again, please call 617-635-7507 and report it.