The surface under the bridge was a bit muddy, but when you gotta sleep, you gotta sleep. I felt safe there however setting up the tent on the mud was a bit tricky and slippery. Worst case scenario was slipping on the mud and landing in the water -- which wasn't likely and wasn't the the worst thing in the world.
Slept great that night, settled moisture in the morning was minimal.
3/14/13
SoilTrek.com