The Western States Pioneer Trail runs for 34 miles between Jedediah Smith Memorial Trail and Auburn Equestrian Staging Area near Gum Lane in Auburn. The trail, open to hikers and horseback riders only, follows the winding course of the American River along the old railroad grade built by the Pacific Portland Cement Company in the early 1900s. The line was used to transport limestone from their quarries near Auburn with the Southern Pacific Mainline in Auburn itself.