The OC&E Woods Line State Trail is a rail trail in Klamath and Lake counties in the U.S. state of Oregon. It is Oregon's longest state park. The trail follows the old OC&E and Weyerhaeuser railroads from Klamath Falls to Thompson Reservoir. Along its 105-mile (169 km) length it passes through the communities of Olene, Sprague River, Dairy, Beatty, and Bly.