Hey No Skills, the Friends bridges are 2X12 PT lumber (used for both the beam and & the top deck), with 14" X 14" blocks at either end for footings. The 14X14 blocks were cut from pressure treated timbers (they were donated by a big-dig contractor). One of my better bridge designs in B'land.
Thanks CP. A little surprised to hear they are just 2x12 pressure treated. I measured the thickness the other day and they were well over 2" thick. Would have thought 2x12 would be 1 3/4" thick, at most. Maybe they were bloated I'm going to use cut up stumps for some of the footings, will probably need to find some timber blocks though.