3W7 Eletric city, WA Grand Coullee Dam V. 1 For FS2004. By Donald Miller Grand Coulee Dam Airport GRANT COUNTY, WASHINGTON The Grand Coulee Dam Airport is located in Grant County, two miles southwest of Electric City. There are six single-engine aircraft based at the Airport. The latest available data indicate that Grand Coulee Dam had a total of 11, 000 annual operations. Runway 3-21 is the Airport s sole runway. This runway is 4, 200 feet long, 75 feet wide, has an asphalt surface, and has pilot controlled medium intensity runway lights. Approaches to both runway ends are visual. Precision approach path indicators provide vertical guidance to Runway 21.