Illinois River Falls is a waterfall on Illionois River in Josephine County, Oregon, in the Klamath Mountains/California High North Coast Range region, with a total height of about 18 feet. It lies about 11.6 miles northwest of Cave Junction and roughly 45.9 miles west of Medford as the crow flies.
At 18 feet it is on the modest side for Oregon, where the typical waterfall with a recorded height stands around 54 feet; it ranks 369th of 425.
The Klamath Mountains and California High North Coast Range are a rugged, geologically complex region of steep ridges and deep river canyons with mixed conifer and hardwood forest, including redwoods near the coast. Wild rivers and steep creeks drop through rocky gorges.
There are 28 recorded waterfalls in Josephine County. Snailback Falls, is about 4.6 miles away. Little Illinois River Falls, is about 6.5 miles away. Swede Basin Falls, is about 6.6 miles away.
Illinois River Falls is located at 42.3031° N, 123.7742° 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 position was verified on aerial imagery. Details on trails, parking and access have not been documented for this waterfall yet.