My dad, I and a few other guys built 2 bridges: the 1st is a stainless steel driveway bridge, and the 2nd is a stainless steel walking bridge, both over the same ravine. Also, the driveway bridge can hold 90 TONS, it has 6 stainless steel I-Beams w/ 86 yards of concrete as a foundation. Enjoy. BTW, these were built at our house in Elba, MN, USA. Thanks for viewing! Here's the address: http://www.diychatroom.com/f49/hand-made-stainless-steel-driveway-bridge-elba-mn-usa-53613/