The Glacial Lake Missoula and the Castastrophic Floods takes a virtual tour of the field evidence associated with the catastrophic flooding of glacial Lake Missoula through Western Montana, northern Idaho, southern Washington, and the Columbia River Gorge to the Willamette Valley near Portland Oregon. Many photographs and images are used to help the reader view the physical evidence along the virtual tour. Details are provided on trip routes through each state along with descriptions of sites along the way. The book is divided into seven chapters. Each chapter presents field evidence for each state. Chapter 1 presents a short introduction to the geologic setting. Chapter 2 discusses the Great Ice Age and glacial Lake Missoula. Chapter 3 begins the field evidence descriptions for Lake Missoula in Montana leading a tour through Western Montana to the northern Idaho state line. Chapter 4 presents field evidence for the flooding in Idaho to the southwestern state line with Washington. Chapter 5 describes filed evidence in southeastern Washington starting with the Spokane Valley and Columbia Plateau. Chapter 6 provides stratigraphic and geomorphic evidence for dozens of late glacial floods starting with the Grand Coulee and Dry Falls, Chelan area, Quincy Basin, Moses Coulee, and ending with the Cheney-Palouse Tract. Chapter 7 ends the tour with descriptions of the Columbia Valley and Columbia River Gorge ending with the Willamette Valley and the City of Portland, Oregon.