... Steel and Timber by System and Year Built – All States + DC and PR . . . . . . . . . . . . . . . . 19Table A.10 – Number and Percent of Bridges with Main Span Material of RC, PS, Steel and ... System and Span Length – All States + DC and PR . . . . . . . . . . . . . . 20Table A.11 – Deck Area and Percent of Bridges with Main Span Material of RC, PS, Steel and Timber by System and Year ... DC and PR . . . . . . . . . . . . . . . . 21Table A.12 – Deck Area and Percent of Bridges with Main Span Material of RC, PS, Steel and Timber by System and Span Length – All States + DC and...