Johnson Creek airstrip in the Idaho backcountry and the grass runway that disappears into the wilderness

Johnson Creek airstrip (3U2) is a 3,400-foot grass strip tucked into the mountains of central Idaho, about twenty miles east of McCall, at 5,100 feet elevation. Maintained by the Idaho Department of Aeronautics, it’s one of the most accessible gateways to Idaho’s legendary backcountry flying — a place where you land on impossibly green grass, walk fifty feet, and put your toes in snowmelt-cold mountain creek water with nobody around for miles.

What Makes Johnson Creek Special?

Johnson Creek sits in a valley with ridgelines pressing in on both sides, the Salmon River country stretching in every direction. The runway runs roughly north-south (Runway 16/34), and the strip is mowed and maintained with a windsock, pit toilet, fire rings, and campsites along the creek the strip is named for.

That’s it. No fuel. No FBO. No terminal building. You fly here to disappear.

In early June, snow still clings to ridges above 7,000 feet while the runway grass glows an impossible green from snowmelt and mountain sun. The parking area fills with Super Cubs, Cessna 180s on tundra tires, Huskies, Maules, and Carbon Cubs. Pilots camp creekside with tents, camp stoves, and folding chairs by the water, flying in four or five times a summer to different backcountry strips across the state.

What Is the Approach Into Johnson Creek Like?

The approach from the northwest follows the valley, and this is where mountain flying demands your full attention. The wind does not behave the way it does over flatland. Thermals bounce off canyon walls, creating updrafts on one side and downdrafts on the other. The windsock at the field can show something completely different from conditions two miles out.

You fly the approach with eyes wide open and speed nailed. The trees on the threshold are tall, and the runway comes up fast. Touchdown on grass feels like landing on a mattress compared to pavement — the mains sink in just slightly, you roll out, and the mountains fill your windshield.

What Do Pilots Need to Know Before Flying In?

This is real backcountry flying. The Idaho Division of Aeronautics and organizations like the Recreational Aviation Foundation (RAF) work hard to keep strips like this open and maintained, but you are on your own out here. There is no cell service and no radar coverage below the ridgelines. If something goes wrong, help is a long way off.

Density Altitude Is the Critical Factor

At 5,100 feet elevation in summer sun, density altitude can push 7,000 feet or higher by early afternoon. That 3,400-foot strip starts feeling much shorter when the airplane thinks it’s at 7,000 feet. Experienced backcountry pilots fly in at the crack of dawn — cool air, dense air, maximum performance. They camp, enjoy the day, and fly out the next morning. Taking off from Johnson Creek at two in the afternoon in July is simply not done.

Get Backcountry Training First

There are backcountry flight schools in McCall, Cascade, and Boise that specialize in exactly this kind of flying. They teach how to read a mountain strip, evaluate wind, execute a go-around when it means climbing toward a box canyon, load for short-field performance, and use tundra tires effectively. A weekend course may be the most enjoyable flying training available, and it makes pilots better everywhere else too.

What Other Backcountry Strips Are Nearby?

Johnson Creek is the gateway. Once you’ve felt what backcountry strip flying is like, the map reveals that Idaho has dozens of backcountry strips maintained by the state: Chamberlain Basin, Thomas Creek, Cold Meadows, and Sulphur Creek Ranch among them.

The legendary strips along the Middle Fork of the Salmon River — Indian Creek, Flying B Ranch, Marble Creek — thread approaches through canyons with short, sloped runways that are absolutely magnificent.

Who Maintains These Wild Runways?

A dedicated volunteer community keeps these strips alive. The Recreational Aviation Foundation organizes work parties where pilots fly in with camping gear and chainsaws to clear brush from approach paths, replace windsocks, and maintain trail access. At a strip called Reed Ranch, volunteers spent an entire weekend clearing the approach path with chainsaws and hand tools so pilots could keep using it safely.

This is aviation community at its purest — no vendor booths, no ticket prices, just people who care about keeping wild runways open.

What’s the Strip Condition Like?

The surface is firm and smooth with just a few soft spots near the north end by the creek. Wildflowers line the grass edges in season. The creek is audible from the entire length of the strip, and the air carries the scent of ponderosa pine and clean mountain dirt — that particular quality air gets above 5,000 feet where it’s thin enough to taste.

Performance on the strip is impressive for properly equipped aircraft. A Carbon Cub was observed touching down in roughly 400 feet on grass, coming in so slowly over the tree line it appeared to hover.

Leave No Trace at Backcountry Strips

Pack it in, pack it out. These places survive because pilots treat them with respect. The Idaho Department of Aeronautics and the Recreational Aviation Foundation count on users to keep strips clean and usable. No trash. No fire scars outside the rings. No buzzing wildlife. Fly in like a guest. Leave it better than you found it.

Key Takeaways

Johnson Creek (3U2) is a well-maintained 3,400-foot grass strip at 5,100 feet elevation, about 20 miles east of McCall, Idaho — one of the best entry points to Idaho backcountry flying
Density altitude is the primary hazard — fly in early morning when air is cool and dense, and never attempt a midafternoon departure in summer
Get backcountry flight training from schools in McCall, Cascade, or Boise before attempting mountain strips for the first time
The Recreational Aviation Foundation and volunteer pilots maintain these strips; supporting their work keeps backcountry flying alive
Leave no trace — the future of backcountry airstrips depends on pilots treating them with respect