Arched beam radius
I built my 20' span with 12" grouted concrete blocks, used a 30" poly pipe, tied the walls with ss cables and back filled with stone. I can drive my pick up over it.
I'd also consider lighting this bridge.
Added: I sure hope you get a permit and an engineers approval for this design.
What we've got here is... failure to communicate. Some men you just can't reach. So you get what we had here last week, which is the way he wants it... well, he gets it.
Last edited by 47_47; 07-16-2008 at 01:07 PM.