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2. A simple beam bridge is a rigid horizontal structure supported by two ends called abutments. Beam bridges can span up to 500 meters in length. Most beam bridges can support light to moderate loads. Beam bridges are usually permanent structures and can be constructed quickly. Beam Bridge 2

3. An arch bridge is composed of a curved structure with abutments on each end. Arch bridges are permanent structures that can span up to 600 meters. Arch bridges can carry heavy loads. Arch bridges take a long time to construct. Arch Bridge 3

4. A suspension bridge is composed of a roadbed that is attached to or suspended from cables. Suspension bridges are permanent structures that can span over 2,300 meters. Suspension bridges can support moderate to heavy loads. Suspension bridges take a long time to construct. Suspension Bridge 4

5. A pontoon bridge or floating bridge is a bridge that floats on water, supported by barge-or-boat-like pontoons that support the bridge deck, or roadbed. Floating bridges are used to bridge short spans and can carry light loads. Floating bridges are usually temporary structures that can be constructed quickly. Floating Bridge http://www.historylink101.com/ww2_color/WorldWarIIBridges/IMG_1178.html 5

6. Your Bridge Type research is now complete. Return to your mission log to analyze the bridge data you have collected. 6