ABSTRACT A two-day, ~300-mile field trip follows the path of ancient Ice Age megafloods through the eastern Channeled Scabland plexus and explores abundant evidence for the last outburst floods from the late Pleistocene within the Cheney-Palouse Scabland Tract, Washington, USA. Features unique to the scablands include spectacular, headward-retreating cataract canyons; giant ripples, bars, and scour holes along with dry waterfalls; battleship-sized, streamlined loess islands; and anastomosing channel networks. Some noteworthy flood features within the Cheney-Palouse tract include a massive 530-ton, ice-rafted, granitic boulder; the hidden Cove Coulees; and a close-up inside a giant flood bar covered with giant current ripples. Also, along the route are two regions with bedrock fracture zones preferentially and spectacularly eroded by megafloods. Less common, but no less significant, is evidence for much older (>130,000 yr) exhumed, middle-to-early Pleistocene flood deposits. These are recognized by >1-m-thick, pedogenic, calcrete caps and paleosols overlying flood deposits. Some of these ancient flood deposits also have a reversed magnetic polarity of early Pleistocene age >780 ka (i.e., Matuyama Reversed Epoch). Older flood deposits like these sometimes lie deeply buried within eolian Palouse loess. Thus, it appears the growth and erosion of windblown loess hills in the Channeled Scabland also extend back to the early Pleistocene.