Zion's Tunnel Road Is Back: Your Complete Guide to the Zion-Mt. Carmel Highway

Introduction: The East Door of Zion Swings Open Again

Some roads are connectors. The Zion-Mt. Carmel Highway is the reason to come.

Zion National Park is restoring full visitor access to the Zion-Mt. Carmel Highway today, reopening the 25-mile route that carries State Route 9 from the mouth of Zion Canyon at Canyon Junction, up a wall of switchbacks, through a 1.1-mile tunnel bored into Navajo sandstone, and out across the slickrock country to the park's East Entrance. The road has been closed since September 30, when a large rock formation collapsed onto the pavement, damaging the roadway and blocking travel — severing the park's eastern connection on the Grand Circle route between Zion, Bryce Canyon, and the Grand Canyon's North Rim. This morning, the detours end.

What Happened: A Rockfall, Then a Race to Reopen

On September 30, a large rock formation collapsed onto the Zion-Mt. Carmel Highway, smashing pavement and blocking the road between Canyon Junction and the East Entrance — severing the park's eastern connection and forcing Bryce-bound travelers onto long detours around the park.

Crews moved fast. On October 6, the park reopened 7.5 miles of road from the East Entrance to Great Arch Overlook for scenic driving while heavy equipment kept working the slide zone. This week, the park announced crews had cleared the debris, removed the damaged asphalt, and hauled in gravel to temporarily stabilize the section — with full repaving planned in the near future. Today, the whole highway reopens to visitor traffic, according to the park's announcement.

Expect a work zone through the repair area: the park is urging drivers to slow down and watch for workers and pedestrians. The South Entrance, the Zion Canyon shuttle, and the Zion Canyon Scenic Drive operated normally throughout and continue to do so.

The Drive: Canyon Junction to Mt. Carmel Junction, 25 Miles

The Zion-Mt. Carmel Highway is State Route 9 through the park — about 25 miles from Canyon Junction, near the mouth of Zion Canyon, to Mt. Carmel Junction and U.S. 89 on the east. Drive it west to east and the road tells its story in the right order: the canyon first, then the engineering. Allow at least 90 minutes with stops — but the stops are the point, so give it half a day.

Don't-miss stops, west to east:

• Canyon Junction — where the highway splits from the Zion Canyon Scenic Drive. This is the gateway: from here, the road starts climbing.
• The switchbacks — seven of them, carved 800 feet up the side of Pine Creek Canyon. Pull over at the guard-walled overlooks and look back: the road you just climbed zigzags below you while Zion Canyon opens up behind it.
• The Zion-Mt. Carmel Tunnel — 1.1 miles through solid Navajo sandstone, opened in 1930. Watch for the gallery windows: slits blasted through the rock that spill daylight — and canyon views — into the darkness. No stopping inside, but the moment the walls open onto those windows is the drive's signature thrill.
• Canyon Overlook Trail — the trailhead sits immediately east of the tunnel's east portal. A one-mile round trip along a fenced cliff edge to a sweeping view down lower Zion Canyon. Short, easy, and absurdly photogenic.
• The east-side slickrock — six miles of pale, rolling sandstone country that feels like another planet after the red canyon. Pullouts punctuate the whole stretch; the light at golden hour is unreal.
• Checkerboard Mesa — the great crosshatched dome near the East Entrance, its surface scored by horizontal and vertical cracks. A roadside pause is enough.
• East Entrance and Mt. Carmel Junction — the road exits the park and meets U.S. 89. Bryce Canyon lies to the northeast; the Grand Canyon's North Rim to the southeast. Visit Utah's highway guide is a good companion for the east-side hikes.

A Tunnel Through a Mountain: The History

The highway was a joint effort of the National Park Service, the state of Utah, and the Bureau of Public Roads — a road designed, as the NPS history page puts it, “to go where no road had gone before.” Four crews started from both ends in 1927: the Nevada Contracting Company carved the switchbacks up from the canyon floor while Utah crews blasted east from Mt. Carmel Junction through six miles of slickrock.

The tunnel was the crux. Workers began by blasting the gallery windows into the cliff face above Pine Creek Canyon, then bored inward from those openings, widening a pilot shaft with drills and dynamite. The windows doubled as chutes for dumping rock debris into the canyon below — and gave the crews inside their only light and air. Collapses were not uncommon, and rockslides on the switchbacks killed at least one worker. Two years and ten months after work began, the road was done: dedicated and opened on July 3, 1930, it made the long-imagined Grand Circle tour of Zion, Bryce Canyon, and the Grand Canyon a reality.

The highway is listed in the National Register of Historic Places, and in May 2012 the American Society of Civil Engineers designated it a Historic Civil Engineering Landmark. Nearly a century later the tunnel is basically unchanged — concrete ribs now reinforce the soft sandstone — and the drive is the one the 1930 motorists knew: rustic masonry bridges, hand-laid rock walls, and arched culverts blending into the cliffs.

If you like historic park roads, our guides to Old Fall River Road and the North Rim's Cape Royal and Point Imperial roads pick up the same theme.

Practical Tips: Driving It Right

1. Check conditions before you go. The NPS alerts page is the authoritative source. This road has closed for rockfalls before, and the repaired section near the slide zone is still awaiting final repaving — temporary closures can appear fast.
2. Know your vehicle. Since June 7, 2026, vehicles over 35 feet 9 inches long, 7 feet 10 inches wide, 11 feet 4 inches tall, or 50,000 pounds are not permitted between Canyon Junction and the East Entrance — the old ranger escort system is gone. Standard passenger cars sail through the tunnel day or night. The NPS large-vehicle page has the full limits.
3. Pay the park fee. The route runs through Zion National Park, so the $35-per-vehicle entrance fee applies. Buy it at the entrance station; it's good for seven days.
4. Drive it west to east. Starting at Canyon Junction, you climb the switchbacks with the canyon views behind you, burst through the tunnel's east portal into the slickrock, and finish at Checkerboard Mesa. The reveal sequence is better in this direction.
5. Slow down through the repair zone. Gravel patches and work crews remain near the rockfall site. Obey posted speed limits and use the pullouts — the road is narrow and the views are distracting by design.
6. Fill up and pack water. There are no services between Springdale and Mt. Carmel Junction. Gas, food, and water happen at the ends.

When to Go

October is the sweet spot. Summer's heat has broken, the cottonwoods along the Virgin River are turning gold, and the low autumn light sets the east-side slickrock glowing. The highway stays open year-round — unlike most mountain passes — but winter storms can bring temporary closures and ice on the switchbacks. Spring brings wildflowers; summer brings crowds and canyon heat, so drive early.

The Bottom Line

The Zion-Mt. Carmel Highway is one of the few roads in America that is itself a historic monument: a National Register-listed, ASCE-recognized engineering landmark you get to drive with the windows down. The September rockfall was a reminder that this road is carved into living, crumbling geology. Today's reopening is a reminder of why it matters — the tunnel is back, the switchbacks are back, and the east door of Zion is open again.

For the road-trip arc, read how Highway 1 through Big Sur came back from its own years of closures — another great American road that refused to stay shut.