- 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)
WordReference Random House Unabridged Dictionary of American English © 2026
Grand′ Cou′lee
(ko̅o̅′lē),USA pronunciation
- Place Namesa dry canyon in central Washington: cut by the Columbia River in the glacial period. 52 mi. (84 km) long;
over 400 ft. (120 m) deep. - Place Namesa dam on the Columbia River at the N end of this canyon. 550 ft. (168 m) high.
Collins Concise English Dictionary © HarperCollins Publishers::
Grand Coulee /ˈkuːlɪ/ n