Canyons (IMAGE) Woods Hole Oceanographic Institution Caption View of one of the canyons in Washington state, U.S., where the enormous Missoula floods once drained through as they flowed to the Pacific ocean. These steep walls were carved as floods plucked away at columnar basalt. Credit (Photo courtesy of Tamara Pico, California Institute of Technology) Usage Restrictions with credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.