I am re-decking a wooden bridge. I need to add a support beam. Can this be done using 2 x 10 pressure treated wood. The bridge length is 24 feet. The beam will need to be the same.
The first answer to any home improvement question is 'it depends'. In general, yes, you can use a 2x10 or rather a number of them to make a 'built-up beam' for supporting a load but you may be better off using a pressure treated Parallel Strand Lumber (PSL) beam. You can find more information and a load chart here: