To protect the innocent and not give SUWA or the Sierra Club any free amunition, I won't say where or when I saw this... But... I'm very disappointed in some riders who think it's fun to go ride the mountain trails too early in the spring when they are really muddy. The damage I encountered was fairly severe with several sections of 100+ yards of 12-24 inch deep ruts right down the middle of the trail. With the rest of the snow pack melting and the spring rains... AND additional riders going down the same ruts, the forrest service is going to deem this as too much erosion and they WILL close the trails. PLEASE, don't ride the trails when they are really muddy. Just turn around and go back home --- or out to the many rideable desert areas until the ground dries up sufficiently.