Dunn Riffle is a stretch of rapids in Josephine County, Oregon, in the Klamath Mountains/California High North Coast Range region. It lies about 5.7 miles west of Merlin and roughly 36.4 miles northwest of Medford as the crow flies.
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.
Josephine County holds 25 recorded rapids, and several are close by. Old Man Riffle, is about 2.3 miles away. Ennis Riffle, is about 2.7 miles away. Lower Galice Riffle, is about 3.8 miles away.
Dunn Riffle is located at 42.5483° N, 123.5232° W. The listing is based on the USGS Geographic Names Information System, 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 rapid yet.