Thank you all for your thoughtful suggestions. As for the expected load, we will be occassionally driving a hay truck over the bridge. In addition, the horse van that comes to pick up is a semi-tractor trailer rig. The firetruck is also a possibility (my neighbor set the countryside on fire...
Thanks so much for the help! I am starting to read about laminated bridge decking. Very interesting. I am afraid that a grated deck won't work in my case. I need to walk horses over the bridge and they freak when they don't have solid looking ground to walk on. BTW, this bridge used to have...
I have bought and had erected a used/discarded county bridge onto my private property. It is a steel pony truss 76' long and (now) 14' wide. There should be no issues with the bridge's structural strength but I need to know about what kind of deck to use. Timber planks seem the cheapest way...