Thanks guys.
The bridge spans about 30 feet or so with a 6-8 foot contact on either end. The creek is not much to look at for most of the year but in the spring it washes pretty good and the banks are way to steep for the sled and a little dangerous for the bikes in the summer. The two supports (one on each beam) were plenty to support things. I'm sure they are going to wash away in the spring but I stashed a few more close by to replace them if need be. The water has never come up high enough to take out the bridge so hopefully it stays that way.
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