Marshall, through Lexington to Fort Osage, then to Independence. Independence was also one of the historic "jumping off points" for the Oregon and California Trails. West of Independence, it roughly followed the route of U.S. Route 56 from near the town of Olathe to the western border of Kansas. It enters Colorado, cutting across the southeast corner of the state before entering New Mexico. The section of the trail between Independence and Olathe was also used by immigrants on the California and Oregon Trails, which branched off to the northwest near Gardner, Kansas. From Olathe, the trail passed through the towns of Baldwin City, Burlingame, and Council Grove, then swung west of McPherson to the town of Lyons. West of Lyons the trail followed nearly the route of present-day Highway 56 to Great Bend. Ruts in the earth made from the trail are still visible in several locations (Ralph's Ruts are visible in aerial photos at (). At Great Bend, the trail encountered the Arkansas River. Branches of the trail followed both sides of the river upstream to Dodge City and Garden City. West of Garden City in southwestern Kansas the trail splits into two branches. One of the branches, called the Mountain Route or the Upper Crossing follows the Purgatoire River from La Junta upstream to Trinidad then south through the Raton Pass into New Mexico. The other main branch, called the Cimarron Cutoff or Cimarron Crossing or Middle Crossing cut southwest across the Cimarron Desert (also known as the Waterscrape or La Jornada) to the valley of the Cimarron River near the town of Ulysses and Elkhart then continued toward Boise City, Oklahoma, to Clayton, New Mexico, joining up with northern branch at Fort Union. This route was generally very hazardous because it had very little water. In fact, the Cimarron River was one of the only sources of water along this branch of the trail. From Watrous, the reunited branches continued southward to Santa Fe. Part of this route has been designated a National Scenic Byway. Challenges Travelers faced many hardships along the Santa Fe Trail. The trail was a challenging of dangerous plains, hot deserts, and steep and rocky mountains. The natural weather was and is continental: very hot and dry summers, coupled with long and bitterly cold winters. Fresh water was scarce, and the high steppe-like plains are nearly treeless. Water flows in the Pecos,