- a dry canyon in central Washington: cut by the Columbia River in the glacial period. 52 miles (84 km) long; over 400 feet (120 meters) deep.
- a dam on the Columbia River at the N end of this canyon. 550 feet (168 meters) high.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- a canyon in central Washington State, over 120 m (400 ft) deep, at the N end of which is situated the Grand Coulee Dam, on the Columbia River. Height of dam: 168 m (550 ft). Length of dam: 1310 m (4300 ft)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012