The Lost Spring Cottonwood Wash Trail is about 76 miles and should take you about 8 hours. Parking is available at the City Park on N200E and Main Street in Green River. This trail will take you all the way up to the remaining cabin at Summerville. make sure to stop at the Kiosk in Cottonwood wash. We rode the trail in a Stock 4 door Polaris ranger. There are no extreme obstacles. There are no width restrictions.