small bridge building with utility poles?

I really great source would be the US army Core of engineers field manual.

There are bridge designs using poles and rope that can hold a tank.

try this as well

http://www.pioneeringprojects.org/resources/ebooks...

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Building A Small Bridge

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RE:

small bridge building with utility poles?

I need to build a bridge across a 20' wide stream.

My idea is to use 30' utility poles, 2+2 where vehicle tires would be, and rough saw 2x? decking.

It is for a driveway so it must support things like the oil delivery truck and (God forbid) fire trucks.

I have available 6 slightly used...

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Even if you bolted 4 14" deep LV L's together you still won't have enough strength to drive a car over it. You're going to need the help of a structural engineer for this one. A 20' free span with the dead loads for the materials plus the live load of a car are huge.

Howdy Bill R..

The bridge your talking about is pretty complicated before you take any ones word for this look at the trestle picture in the 6 th row down second from left. Its more brown than the others...notice the cap on top of the post columns ..from the E