- Table Mountain is a peak rising on the north side of the Columbia River in Washington state, about 4 miles (6.4 km) north-northwest of Bonneville Dam. It is one of the most spectacular landmarks of the Columbia River Gorge. Its southeast face drops 2,400 feet (730 m) in less than one horizontal mile (1.6 km.), and is topped by an almost vertical 800-foot (240 m) cliff. Table Mountain is joined by the similar Greenleaf Peak to the northeast, and also by Hamilton Mountain to the southwest, which is lower, (2,438 ft or 743 m), but similarly steep and much closer to the Columbia. Together these peaks form an impressive group on the Washington side of the Gorge.