Looks like a great day! Were all the bikes on at least sport touring tires? looks like lots of gravel for traction in the water crossings, gravel is good, dirt especially top soil can be tricky with street tires.
Most street focused bike on the ride?
Most street focused bike on the ride?
Here is the track if anyone wants it... it can be done on a big bike with street tires, but don't go alone in case you get into trouble.
http://www.wikiloc.com/wikiloc/view.do?id=9694140