Places to Go: Harpers Corner Area - Dinosaur National Monument (U.S. National Park Service) Located on the Colorado side of the monument, Harpers Corner Drive is a scenic, 32-mile (55-km) road that leads to the heart of Dinosaur National Monument's canyon country. Overlooks offer sweeping vistas of the Green and Yampa river canyons. Several picnic areas and the trailheads of three hiking trails are located just off Harpers Corner Drive. On one trail, sharp-eyed hikers can spot fossils of small sea creatures that lived long ago. Visitors prepared for remote driving conditions can access two unimproved roads from Harpers Corner Drive.