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A large chunk of asphalt fell from the partially demolished bridge deck to the ground between the sidewalk on C Street and the existing bridge 16/5 E Pier 16. The piece of asphalt was approximately 6' X 4' X 4" and weighed around 1800 pounds. It fell approximately 50' to the ground. Nobody was in the immediate area when the piece fell at approximately 9:00pm. However, the demolition subcontractor was working on the opposite side of C Street at the time. The chunk was a part of the asphalt overlay on the bridge deck and had been loosened by the demo that had occurred in the day prior to the event. The demolition subcontractor had been using the demo tool on the end of the excavator arm to clear all loose debris on the partially demolished deck edge at the end of every shift and visual checked with a manlift, however, inspection of the deck the morning after the incident showed large chunks of loose asphalt near the deck edge. To reduce the risk of similar incidents occuring in the future, we are recommending implementation of the following three solutions: - To control the cause "manlift inspection did not reveal the debris", we propose the addition of an end-of-shift inspection from the top side for all elevated road decking demo jobs. - To control the cause "inadequate lighting", we propose to equip crews with high powered lighting for inspections - To control the cause "1800 lb asphalt chunk fell off bridge", we propose to install protective safety restraints over top of elevated roads to prevent asphalt movement after demo work.We had a near miss incident when a large asphalt chunk fell in an area where people could have been present. People could have been present because this occured on an open public street where construction crews were working. Crews were working there because the bridge was due for demolition because it had been ruled unsafe. The asphalt chunk fell because it was elevated on the partially-demolished bridge, it was close to the edge, and vibration from the nearby roadway moved it. It was elevated because it was not cleared and it was missed in inspection. It was not cleared because the crew used a long demo tool and did not see the chunk. We are unsure why the chunk was not found in inspection.