The Straight Creek to Confluence with Lewis River run in Washington State has an ideal streamflow range between 800 and 5,000 cubic feet per second (cfs). The segment is rated as Class III, with frequent rapids and obstacles such as boulder fields, small drops, and waves. The total mileage for this run is approximately 5.6 miles.

Specific rapids and obstacles on this stretch of the river include the "Tunnel of Love," a narrow chute with a sharp turn, and "Satan's Eyeball," a large boulder in the middle of the river that creates a challenging obstacle. The run also features several eddies and pools, providing opportunities for rest and recovery.

Regulations for the area include a permit requirement for commercial outfitters and a Northwest Forest Pass for parking at the put-in and take-out locations. The use of alcohol and drugs is prohibited on the river, and all boaters must wear appropriate safety gear, including helmets and personal floatation devices. It is also recommended that boaters have prior experience or hire a professional guide for this challenging run.