Bureau of Land Management, Wyoming.
The Hydrology Road (BLM Road 3422) route follows two-track and improved graveled roads. It starts near the Continental Divide and crosses over the Divide twice. Vegetation includes sagebrush, aspen, and cottonwood. Spectacular vistas of the Sierra Madre and Snowy Range Mountains abound. Wildlife viewing includes: pronghorn, elk, deer, and raptors. The loop ride is about 35 miles with some opportunities for side trips. Ride time is from 2 to 5 hours.
From Rawlins, head south on State Highway 71 that becomes Carbon County Road (CR) 401 about 11 miles south of Rawlins. Continue on CR 401 for about 17 miles. Start riding at BLM Road 3422 (Hydrology Road) and head easterly 17 miles to intersect with CR 500. Head westerly on CR 500 for 15 miles to CR 401. Turn north on CR 401 and ride three miles to the start of the ride. This 35 mile loop route can be ridden in either direction. For those that would rather stay on two-track roads (avoiding graveled roads) this route can be an out-and-back ride of 34 miles. This route does cross private land so ask permission before riding off of public roads.