U.S. 16A

U.S. 16A

Nature, Parks, & Gardens • Custer, South Dakota United States

U.S. Route 16A, known as the Iron Mountain Road, is a marvel of engineering and natural beauty, offering an unforgettable drive through the Black Hills of South Dakota. The road is famous for its narrow tunnels, hairpin curves, and pigtail bridges, designed to give travelers stunning views of Mount Rushmore through its carefully aligned tunnels. The journey on U.S. 16A is as thrilling as it is scenic, with sections that loop over themselves, allowing drivers to experience the landscape from multiple perspectives.

The route covers approximately 17 miles, with numerous pull-offs where visitors can stop to enjoy expansive vistas of the surrounding forest and mountain scenery. Each turn and tunnel reveals a landscape rich with ponderosa pines and the occasional glimpse of wildlife, including deer, elk, and bison. The road's design integrates seamlessly with the rugged terrain, enhancing rather than overpowering the natural beauty of the region.

Driving Tips


Traveling U.S. 16A requires careful driving, particularly during busy tourist seasons when the road can be crowded. Early morning or late afternoon drives are recommended for those looking to avoid the crowds and catch the soft glow of the sun as it highlights the granite peaks and dense forests. Whether covered in the lush green of summer or the brilliant golds of autumn, U.S. 16A provides a picturesque journey through one of America's most cherished landscapes.

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$749 Tour Provided by Viator
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Ultimate Premium Tour: Mt Rushmore-Crazy Horse-Custer State Park

The Ultimate Private Black Hills Luxury tour of the famous Mt Rushmore and Crazy Horse - along with a Bison Safari. Perfect for couples, families, small groups seeking exclusive adventure. Experience Custer State Park on a premium, crowd-free, safari. Choose your perfect ride—a Mercedes Calèche Glass Top Sprinter, a Lincoln Executive Limo (AWD), or a specialized Jeep Gladiator (4x4). Enjoy views - perfect for photographing Custer State Park's 1,400 free-roaming bison and wildlife. Premium Lakeside Dining: Unwind with a beautifully curated private picnic right by the water. Smart Summer Scheduling: Our "Beat the Heat" summer itinerary avoids the intense afternoon sun, keeping you cool and maximizing your chances of wildlife sightings. Offered Year-Round: While winter snow and ice may occasionally close specific mountain passes and highways, both major national monuments and the Wildlife Loop remain open daily. Our AWD and 4x4 vehicles ensure a safe, smooth journey in any season.

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$399 Tour Provided by Viator
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The Only Full Day - Jeep Bison Safari - W/ Lakeside Picnic Lunch

Discover Custer State Park’s Untamed Beauty - Experience one of the nation's largest state parks like never before. Spanning 71,000 scenic acres in the Black Hills, Custer State Park is a sanctuary for abundant wildlife and rugged adventure. This 6-Hour Jeep Bison Safari Open-Top-Tours is authorized to guide you through the entirety of the park. Our comprehensive 6-hour safari takes you deep into the backcountry and includes an exclusive trek to the Mt. Coolidge Fire Lookout, offering breathtaking views of the Southern Hills from 6,020 feet. Ride in Comfort and Style - We navigate the rugged terrain in custom-modified Jeep Gladiators and Wranglers. Accommodating 2 to 14 guests, our unique open-top vehicles offer unmatched panoramic views perfect for spotting roaming bison and native wildlife. Our professional guides are local experts and a total "hoot" to travel with! They will bring the region's rich history to life, track the wildlife, and answer all your questions.

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