Most visitors see the wild stretch of the Snake River below Hells Canyon Dam from a guided jet boat or a raft run by a licensed outfitter. Some want to take their own boat. If that is you, the first thing to know is that the river is permitted water, and the rules depend on two things: whether you are floating or running a powerboat, and when you plan to go. Everything below comes from the Forest Service's Hells Canyon National Recreation Area pages, which are the place to confirm the current details before you commit to a date.
A permit, every day of the year
There is no permit-free season on this river. The Forest Service requires a permit to float the Wild and Scenic Snake River at any time of the year, and the same goes for powerboats. What changes with the calendar is how you get one.
Primary season and the Four Rivers Lottery
The busy part of the year, the primary season, runs from the Friday before Memorial Day through September 10. In those months, private float trips go through the Four Rivers Lottery, a shared permit process that also covers three other famous Idaho rivers: the Main Salmon, the Middle Fork of the Salmon and the Selway. Primary-season reservations are offered through the National Recreation Reservation System on Recreation.gov, and the first day you can make one is March 1, at 7 a.m. Pacific Time.
In practice that means summer float trips are planned in winter. If a July trip through the canyon is on your list, mark the opening date on the calendar and read the lottery instructions well before it arrives.
Secondary season: self-issue permits
From September 11 through the Thursday before Memorial Day, the secondary season, the process is simpler: a self-issue permit is available at major launch sites on the river. A permit is still required; you just fill it out at the launch rather than winning it in advance.
That makes early autumn an appealing window for a private trip. Fall brings milder temperatures and thinner crowds to the canyon, and the long, low light suits the place well. Pay attention to the exact dates, though: September 10 is still primary season, and September 11 is the first day of the secondary season.
Powerboats
Private powerboat trips follow the same two seasons but have their own reservations. In the primary season, powerboat permits are reserved through Recreation.gov, the same system used for float trips, with reservations opening on March 1 at 7 a.m. Pacific Time. In the secondary season, self-issue permits are available at major boat launches. When you search, make sure you are looking at the powerboat listing rather than the float listing; the two are separate.
Watching the flows
River levels matter for any boat trip, and the Forest Service points boaters to a display from Idaho Power that shows four days of flow for the Snake River below Hells Canyon Dam, measured in cubic feet per second. It is worth checking in the days before a trip and again just before you launch.
Guided trips and the uplands
The permits described here are for private trips. Guided jet-boat and raft trips with licensed outfitters remain the easiest way onto the river, and our Hells Canyon guide describes what those trips are like.
The recreation area is far bigger than the river. It covers 652,488 acres across northeastern Oregon and western Idaho, and its Idaho section takes in the high country away from the water: the Hells Canyon Wilderness in the Seven Devils, Black Lake, Heavens Gate Lookout, Windy Saddle and the Seven Devils recreation area. Plenty of visitors see the deepest river gorge in North America from up there without ever getting in a boat.
Planning from Cambridge
The Forest Service names Cambridge and Council, along with Riggins, Grangeville and Whitebird, as the Idaho communities with services within an hour of the recreation area's Idaho uplands. For a river trip, a night in town before an early start is a good way to arrive rested, with a full tank and plenty of water. Our trip-planning guide covers the drive, the seasons and what to pack.