I built two campbells wood truss bridges (double track) and I am placing them end to end. Now I'm not sure if it's orthodox or not, but I have 7 1/4" between the bridge and the water bottom. So I need a support pier for the center here. Does anyone know of a pre-made pier to use for this? Or do I need to make one. IF I need to make one, what do I make it out of?
Or should I raise up my bottom a bit?
Or should I raise up my bottom a bit?