Forty-Five Creek to Middle Fork Loop

This remote and challenging 52.8-mile lollipop loop explores some of the most rugged and wild stretches of Idaho’s Middle Fork country. Starting on the Forty-Five Creek Trail, the route stitches together a series of lesser-traveled trails—Pistol Creek, Middle Fork, West Fork Thomas Creek, Sheep Mountain Ridge, and Lake Creek—to create a grand tour of remote canyons, high ridges, and expansive wilderness. Expect deep solitude, tough trail conditions, and the kind of views and wildness that only come with earning them. This loop is best suited for experienced backpackers comfortable with route finding, water crossings, and significant elevation change.

Start your journey on the Forty-Five Creek Trail, eventually connecting to the Pistol Creek Trail. You’ll reach the Pistol Creek Campsite when you hit the Middle Fork of the Salmon River. Turn left and continue following the river along the Middle Fork Trail. Expect expansive canyon views and easy access to water, though parts of this section can be rocky and rough.

Before reaching the Thomas Creek Airstrip, you’ll cross the river, leaving the Middle Fork Trail and picking up the West Fork Thomas Creek Trail. From here, you'll make a loop by connecting the Sheep Mountain Ridge Trail and the Lake Creek Trail, which will bring you back to the Pistol Creek Trail. Retrace your steps along Pistol Creek and Forty-Five Creek to return to your starting point.
Flora and Fauna
The loop passes through dense pine and fir forests, open sagebrush slopes, lush creek valleys, and high alpine meadows. Keep an eye out for mule deer, elk, black bears, and possibly mountain goats along the ridgelines. Wildflowers paint the meadows in summer, and raptors often soar overhead.
Permits and Camping

• No special permits required for standard backpacking, but always double-check local regulations.

• Practice Leave No Trace ethics—this area is remote, and you may not see anyone else for days.

• Ample backcountry camping options exist along creeks and benches throughout the route.

Considerations

• Trail Conditions: Some sections, especially West Fork Thomas Creek and Lake Creek, may be faint, overgrown, or blocked by deadfall. Carry a good map or GPS and check with local ranger stations about current conditions before heading out.

• Water Crossings: Several creeks must be crossed—depending on the season, they may be swift or high.

• Remoteness: Rescue services are far away. Travel with a partner if possible and carry a satellite device.

Seasonality: Snow can linger on north-facing slopes well into early summer. High heat can make late summer travel tough without sufficient water planning.