Johnson Creek, Idaho, the Backcountry Grass Strip Where You Camp Under the Wing and Soak in a Hot Spring After You Land

Johnson Creek Airport (3U2) is a 3,500-foot mowed grass runway on the valley floor of the Frank Church–River of No Return Wilderness in Valley County, Idaho, north of the small town of Yellow Pine. Owned and maintained by the State of Idaho through the Idaho Division of Aeronautics, it offers free campsites, a bathhouse with hot showers, and water at the tie-downs - making it one of the few airfields in the country where you can pitch a tent under your wing and hike to a natural hot spring after you land. It is widely considered the crown jewel of American backcountry flying, but it demands real mountain flying skill to reach safely.

Where Is Johnson Creek Airport and Why Is It Special?

Johnson Creek sits at just under 5,000 feet on the floor of a canyon deep in central Idaho’s wilderness, surrounded by ridges that climb past 9,000 feet. There is no road access to speak of - the practical way in is by air, following the creek that gives the strip its name down into a bowl of granite and lodgepole pine.

What sets it apart is who runs it. Rather than paving it, fencing it, and charging landing fees, the State of Idaho keeps the grass mowed like a fairway and built the place up for visiting aviators. There are established campsites, a bathhouse with hot showers, and water spigots run out to the tie-down area.

The result is a fly-in campground you can only reach with wings. On a summer weekend the tree line fills with taildraggers on fat tundra tires - Super Cubs, Cessna 185s, Maules, Carbon Cubs - with tents pitched off the wing struts, families camping, and kids running in the grass.

Is Johnson Creek Hard to Fly Into?

Yes. This is genuine backcountry flying, not a casual Saturday-morning destination. Most pilots use essentially one way in and one way out, and there is high terrain in every direction with no room for a conventional go-around.

The biggest hazard is density altitude. On a warm summer afternoon, the thin mountain air robs an airplane of the climb performance it had at lower elevations, and pilots regularly get into trouble underestimating it.

Pilots who fly here successfully prepare for it. They take mountain flying courses, arrive early in the morning when the air is cool and dense, keep the airplane light, and fly the field the first time with someone who already knows it. Respecting the terrain and the density altitude is non-negotiable.

What Aircraft Fly the Idaho Backcountry?

The backcountry has its own breed of airplane: STOL - short takeoff and landing - machines. They ride on oversized soft tires known as tundra tires or bush wheels that roll over rocks, ruts, and gravel, paired with beefed-up landing gear built to absorb hard arrivals.

Some of these aircraft can get airborne in a couple hundred feet. Skilled backcountry pilots treat short-field work as a craft - flying slow flight right on the edge of a stall, “hanging on the propeller,” then greasing the airplane onto the grass. A well-flown Carbon Cub can clear the trees, chop the power, and stop in roughly three airplane lengths.

The whole appeal is precision: doing more with less.

What Do You Do Once You Land?

Camping is the main event. You shut down to near-total silence - no traffic, no hum, just the cooling engine, the creek, and wind in the pines - set up camp beside your airplane, and settle in.

Many pilots fly in specifically to reach the natural hot springs scattered throughout this part of Idaho. Warm water rises straight out of the ground in wild, free pools, so you can land, camp, and hike out to soak beneath a sky with virtually no light pollution for a hundred miles in any direction.

Mornings are just as memorable: fog settles low in the valley, frost lights up on the grass, and the airplanes wake one by one before flying out through the canyon while the air is still cool.

A Living Tradition Handed Down

Johnson Creek is a place where backcountry knowledge passes directly from pilot to pilot. It’s common to meet aviators who have flown the valley for more than 50 years, who learned it from their own parents and now bring their grandchildren - three generations reading the same wind off the same ridge in the same airplane.

That mentorship matters, because this kind of flying isn’t learned from a book. It’s learned from someone willing to walk you to the end of the runway and show you exactly where you need to be off the ground.

Why These Airstrips Need to Be Used to Survive

Johnson Creek is one of dozens of backcountry airstrips across Idaho, many sitting inside wilderness and national forest land. They face constant pressure from funding shortfalls, politics, land-use disputes, and wildfire.

The Idaho Division of Aeronautics, along with volunteers and groups like the Recreational Aviation Foundation (RAF), keep these strips mowed, maintained, and legal - often through fly-ins where volunteers arrive with weed trimmers, paint, and labor.

The hard truth: a backcountry strip that nobody uses and nobody maintains disappears. The forest reclaims it, or it gets closed - and closed strips rarely come back. Showing up and using these fields responsibly is part of what keeps them open.

How to Fly Johnson Creek the Right Way

If you go, go prepared:

Get mountain flying training before you attempt it.
Study the field in advance. The Idaho Division of Aeronautics publishes an airport facility directory with approach photos, diagrams, and field notes for every backcountry strip.
Fly it cool, early, and light, and respect the density altitude.
Bring an experienced pilot with you the first time.
Pack out everything you pack in - the field stays perfect only because visitors keep it that way.

Key Takeaways

Johnson Creek (3U2) is a 3,500-foot grass strip at just under 5,000 feet in Idaho’s Frank Church–River of No Return Wilderness, owned and maintained by the State of Idaho.
It’s one of the few airfields designed for camping, with free campsites, hot showers, and water at the tie-downs, plus access to nearby natural hot springs.
Reaching it safely requires mountain flying skill: expect one way in and out, high terrain, and dangerous density altitude on warm afternoons.
The backcountry runs on STOL aircraft with tundra tires and a culture of precision short-field flying passed down between generations.
These strips survive only through use and volunteer stewardship by the Idaho Division of Aeronautics and the Recreational Aviation Foundation - fly them responsibly and pack out what you pack in.