Mud sleds were designed to navigate the difficult, muddy terrain of swamps while carrying heavy loads of timber. They had two sets of white oak and metal runners, one for the front and another for the back, with a chain or pole connecting the two sections. This design supported heavy loads on both ends and made turning easier. In the right conditions, a single mud sled could carry dozens of logs at a time. Logging sleds were originally designed for snow but were modified for muddy conditions in the Great Black Swamp region, when tree removal and the use of tiles to drain the area began turning it into farmland. By the end of the 1800s, the swamp, once 1,500 square miles, was nearly gone.