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.
"Everyone I know in bicycling is at least a little bit crazy, present company included." Sheldon Brown