Definately wheelie the front wheel onto it at moderate speed. I would then completely unweight the rear of the bike and lift it by wieghting the front and pushing the handlebars forward. I would also cheat and use the clipless pedals . Kind of like a bunny hop but your front wheel will contact the bridge first. Then pedal on out of there.
I think speed is key. you have to keep it up.
I have a section like this on a trail I ride a lot. In fact, it is a boyscout bridge also. The toughest part was to try it at a speed where you could make it. The tendancy was to try it going to slow and then you would stall out. Becuase on either side is nasty ass swamp about 5 feet down.
I will say this too, there are probably 4 or5 different techniques that will all work
Last edited by C Law; 05-05-06 at 11:48 AM.