The following websites have information on trails around the West.
GPX Exchange http://www.gpsxchange.com/
Experience Arizona http://www.experience-az.com/adventures/4wd/index.html
Arizona Offroad http://azoffroad.net/
Trail Damage http://www.traildamage.com/
Jeep the USA http://www.jeeptheusa.com/
Bush Ducks http://bushducks.com/tripreps/passopen.htm#altalakes
Trails Off-Road https://www.trailsoffroad.com/
Arizona Off-Road http://azoffroad.net/
Trail Damage http://www.traildamage.com/
Jeep The USA http://www.jeeptheusa.com/