The Hammer Creek to Confluence with Middle Fork Salmon River whitewater river run in Idaho is a thrilling adventure for experienced paddlers. This 20-mile stretch of river is rated as a Class III to Class IV, with a flow range of 800 to 5,000 cubic feet per second (cfs). The best time to take on this run is during the spring when the snowmelt increases the water flow.

There are several notable rapids throughout the run, including Dollarhide, Elkhorn, Hancock, and Sulphur. Paddlers should be prepared for technical maneuvers and tight turns, as well as potential hazards like undercut rocks and strainers.

It is important to note that this section of the Salmon River is within the Frank Church River of No Return Wilderness, and therefore has specific regulations in place. Permits are required for all overnight trips, and there are limits to group size and camping locations. Additionally, visitors must adhere to Leave No Trace principles and pack out all trash.