Contact whoever manages the forest and let them know.

Send an email to a couple of the local mountain bike groups. There are a bunch in Idaho and they all have a vested interest in keeping up the trails.

http://www.singletracks.com/mountain-bike/club.php
https://www.swimba.org
http://www.cimbarides.org
http://snakerivermountainbikeclub.com
http://eaglebikepark.org


Buy a pair of decent boots.

Quit whining.

“Life is life and fun is fun, but it's all so quiet when the goldfish die.”