I have a canal 16 feet across. I want to put a 4 foot wide bridge over it using 2 beams spread 3 ft. What size beams are needed. Load = 700?

6 Answers

  • Anonymous
    2 weeks ago

    Steel? Wood? Something else?

    What do you plan to lay on the beams?

    700 what?

  • 1 month ago

    Bridge design on yahoo answers? 700lbs? 16ft is a little long without some support midway. The stronger the beams, the heavier they are. Maybe two pine tree trunks properly anchored at both ends

  • 1 month ago

    700, huh? 4 foot wide bridge with 2 beams 3 feet apart. 700 what by that way?

  • Joseph
    Lv 7
    1 month ago

    And are the beams made of high strength steel or Swiss cheese? It does make a difference, you know.

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  • 1 month ago


  • 1 month ago

    20 inches would do the job

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