Sulphur Slide Rapid is a stretch of rapids in Custer County, Idaho, in the Idaho Batholith region. It lies about 45.8 miles southeast of McCall and roughly 79.8 miles northeast of Boise as the crow flies.
The Idaho Batholith is a maze of steep granite mountains and deep canyons blanketed by lodgepole and ponderosa pine and Douglas fir, with some of the largest roadless areas in the lower 48. Rivers here are wild and fast, dropping through rocky gorges.
Custer County holds 4 recorded rapids, and several are close by. Powerhouse Rapids, is about 5.8 miles away. Pistol Creek Rapids, is about 13.3 miles away. Ski Jump Rapid, is about 18.3 miles away.
Sulphur Slide Rapid is located at 44.5685° N, 115.3009° 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.