Ancient Lake Falls is a 100-foot waterfall in Grant County, Washington, in the Columbia Plateau region. It lies about 7 miles southwest of Quincy and roughly 46.5 miles northeast of Yakima as the crow flies.
At 100 feet it is taller than the typical Washington waterfall of about 82 feet, ranking 398th of 941 with a recorded height. The tallest single drop is 50 feet. By form it is a tiered waterfall, falling in several distinct steps one after another, combined with a plunge character. It falls in 2 drops.
The Columbia Plateau is a vast expanse of layered basalt flows covered by sagebrush steppe, grassland and dryland wheat. Waterfalls here drop over basalt cliffs in coulees and river canyons carved by ancient floods.
Grant County holds 15 recorded waterfalls, and several are close by. Upper Ancient Lakes Falls, a 20-foot segmented plunge waterfall, is under a mile away. Crater Coulee Falls, is about 6.6 miles away. Frenchman Falls, a 200-foot tiered plunge waterfall, is about 8.2 miles away.
Ancient Lake Falls is located at 47.1526° N, 119.9398° W. The listing is based on the World Waterfall Database, one of the sources compiled by the U.S. Geological Survey in its inventory of waterfalls and rapids of the conterminous United States. The exact position has not yet been verified on aerial imagery, so treat the map pin as approximate. Details on trails, parking and access have not been documented for this waterfall yet.