“Run the largest piece of the trail and see a bit of everything.
— Joseph States
The Yellowstone / Grand Teton Rail Trail is officially 104 miles from end to end and is part of our Idaho State Park and Recreational Trailway system. In reality, it is composed of 3 remaining runable sections with miles of highway, forest service roads and farm roads connecting the three. As of Nov 2017, these 3 sections will provide you with 78.4 miles of "Rail Trail".
You can expect beautiful wooded areas on the northern end and waves of farmland and a few tressels on the Southern end of the Rail Trail. You can also expect to enjoy an ever-changing view of the Teton Mountain Range.
The Oregon Pacific Rail lines were established to provide tourist access to the Yellowstone and Grand Teton National Parks in 1908 and 1913.
The running surface is dirt and gravel but obviously, maintain easy RR grades throughout.
This section: Handy bathroom and lots of parking separate this section from the others. Head southwest on the remains of the RR bed. South Fork Road will join you and provide an occasional dust cloud for a few miles. Cross over Black Canyon Loop Road and Big Springs Loop Road just before coming to Henry"s Fork trestle.
As you climb up the river bank the trail turns into a snake for 0.25 mile. (I know, how can that be? It just is) Keep going. You'll see Big Springs Loop Road again and parallel Trude Road for miles before crossing it. Next, pass Rainbow Road in Island Park. Now run straight as an arrow for miles. Turn ever so slightly so you are going south to Eccles. Don't blink, it is only a road and a clearing now.
Press on to Pineview where you'll again cross Eccles Road and the headwaters of the Warm River. Big surprise, you'll cross Warm River Road three times on the way to Gerrit, home of a horse corral. Cross over Warm River Fish Hatchery Road and parallel Wood Road to Warm River where you'll follow it to the campground.
FROM WEST YELLOWSTONE: (9.7 mi)
Head south on N Electric St toward Alley B 0.2 mi
Turn right onto Yellowstone Ave 0.4 mi
Continue onto Old Airport Rd 1.5 mi
Continue onto S Fork Rd 0.6 mi
Turn left onto S Fork Rd/US Frst Service Rd 478 108 ft
Turn left to stay on S Fork Rd/US Frst Service Rd 478. Continue to follow S Fork Rd 6.9 mi
Turn left onto US Frst Service Rd 1751 180 ft
FROM ASHTON: (8.5 mi)
Turn right onto N 3600 E 0.2 mi
Turn right onto 1350 N 1.0 mi
Turn left onto N 3700 E 0.5 mi
Turn right onto E 1400 N 3.4 mi
Turn left onto ID-47 N/Mesa Falls Scenic Byway 2.8 mi
Turn right onto Warm River Campground Rd 0.4 mi
Slight right to stay on Warm River Campground Rd 0.2 mi