re: OB Engineers: Steel Beams to Make a Bridge

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How will you keep the bank from eroding from beneath the bridge?

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Bank is relatively stable as this is in a straight shot on the creek. It shouldn't erode much in either direction. But that's why I'm thinking the 89 foot railcar to cover 75 feet. Plus, I will probably weld some extensions of another 12 feet to each end, and then dig them out and set them in concrete. To give it some extra room for the bank to move.

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Tank car culverts are too small/the ravine is too deep?

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Way too small. Ravine is not too deep. But is definitely too wide.