Half Moon Riffle is a stretch of rapids in Curry County, Oregon, in the Klamath Mountains/California High North Coast Range region. It lies about 27.5 miles south of Myrtle Point and roughly 59.9 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.
There are 65 recorded rapids in Curry County. Paradise Riffle, is under a mile away. Brushy Bar Riffle, is under a mile away. Devils Stairs, is about 1.2 miles away.
Half Moon Riffle is located at 42.6933° N, 123.9422° 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.