The trail starts at the kiosk and runs north approximately 11 miles. The trail follows the west bank of the green river and is marked by 3 foot high green treated posts with the intials "WBHT" (aka warren bridge hiking trail), it goes through all the campgrounds so you could park at any campground and get on the trail. Some parts of the trail are excellent, some are grown over with grass, some parts are really close to the campground spot (which may be awkward if someone is camped there). The trail is relatively flat with a slight incline. It is a fun trail and needs riders to get worn in!
From Pinedale follow highway 191 northwest towards Jackson, for about 20 miles. You will get to the Green River and Warren Bridge turn right at the Warren Bridge Recreation Area go a couple hundred feet and you will see a turnout and kiosk park here.
http://www.singletracks.com/item.php?c=1&i=5272