How to build a bridge that people can walk across? It needs to be able to hold

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  1. Paul Edmondson profile imageSTAFF
    Paul Edmondsonposted 9 years ago

    How to build a bridge that people can walk across?  It needs to be able to hold up to 500 pounds and will stretch about 10 feet wide over a creek.

  2. RVDaniels profile image72
    RVDanielsposted 9 years ago

    Hi Paul. The simplest way to brige the creek is to use  3 logs the length of the creek  anchored to the ground with steel spikes set with concrete. Cover the logs with a platform made of 1x4 boards ( use marine quality) or you could use some treated deck planks.
    I hope this was helpful.

  3. Hi-Jinks profile image60
    Hi-Jinksposted 9 years ago

    First ask about zoning and insurance reg.

  4. dlarson profile image86
    dlarsonposted 8 years ago

    500 pounds over only 10 feet?  It doesn't have to be a very heavy bridge at all - one 12" log should do it.  Also, you can use a short log as a "mud sill" embedded alongside the creek bank.

    I've built several bridges like this spanning creeks from 10-feet to 36-feet.  My bridges were built to carry a pack train so were pretty heavy.  Here's my suggestion:

    1)  Two Douglas-fir (or Cedar) mud sills, 12-inches in diameter, 8-feet long, peeled and bedded along the creek banks.  Pin them into the bank with 4' long 5/8" rebar stakes (pre-drill holes through the sills).
    2)  Two 10-inch diameter stringers about 12-feet long (or that will overlap your mud sills by about a foot), peeled.  Space them about 2 feet apart.  Species doesn't really matter unless you want it to last 100 years.  Notch the mud sills and set the stringers in the notches, then drill two holes in the stringer at each notch and drive in an 18" piece of 1/2" rebar.  If you want to get really fancy, treat all exposed cuts on your logs.
    3)  Deck the bridge with 5"-6" logs split in half down the center, laid flat surfaces up.  2x dimensional lumber would probably support people just fine, but untreated lumber gets tender in damp conditions.
    4)  Put up a handrail or curb logs along the edge to remind the kids that it's wet over the sides.

    If you need some pictures, I do have many available...


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