Sudden Valley Falls is a waterfall in Whatcom County, Washington, in the Puget Lowland region, with a total height of about 93 feet. It lies about 0.8 miles southwest of Sudden Valley and roughly 6.8 miles southeast of Bellingham as the crow flies.
At 93 feet it is taller than the typical Washington waterfall of about 82 feet, ranking 427th of 941 with a recorded height. The tallest single drop is 60 feet. The water comes down as a tiered waterfall, falling in several distinct steps one after another, combined with a horsetail character. It falls in 2 drops.
The Puget Lowland is a glacially shaped basin of low hills, lakes and wetlands between the Olympics and the Cascades, once covered by Douglas fir and western red cedar and now the most settled part of Washington. Streams here run through terraces of glacial till and outwash, with waterfalls where creeks cut through the deposits.
There are 348 recorded waterfalls in Whatcom County. Lower West Austin Creek Falls, a 34-foot veiling horsetail waterfall, is under a mile away. West Austin Creek Falls, is under a mile away. Austin Creek Falls, a 47-foot horsetail waterfall, is about 1 miles away.
Sudden Valley Falls is located at 48.7138° N, 122.3570° 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.