The Turnbull National Wildlife Refuge protects a portion of the ‘Channeled Scablands’ of ice age flood fame. The refuge has a 5.5 mile auto route through part of it. This makes a comfortable undulating loop for hikers. (Where else can you walk four or five abreast, with leashed dogs and strollers?). You can also drive or bike the auto route, stopping at the many viewpoints along the way.