The Katy Trail is a 237 mile trail stretching across most of Missouri. It is America's longest "rails-to-trail" project, formerly the MKT rail line. This trail starts with quiet farmland and then follows large river bluffs. The recommended tire width for the trail is 25mm or wider. The trail is flat and scenic. There are long distances without access to water, so runners and hikers should carry water and plan ahead.