
Where is the Boulder Basin?
Usa, north-america
9.17 km
2,987 m
hard
Year-round
Okay, picture this: You're in central Idaho, about 15 miles northwest of Ketchum, ready for an adventure. You're heading toward Boulder Basin, way up in the Boulder Mountains. This ain't your typical Sunday drive, though. Forget the pavement! You're hitting Boulder Creek Road (aka County Road 158A and 158), a 5.7-mile stretch of pure, unadulterated dirt-road fun.
Starting from Highway 75, you'll climb a whopping 2,792 feet to nearly 9,800 feet above sea level. That's an average grade of over 9%! Trust me, this road is bumpy, rocky, and rough. We're talking serious 4x4 territory here – high clearance is a MUST, and airing down your tires is a smart move. The higher you go, the wilder it gets, with the road turning into shale rock and sometimes even a stream running right down the middle! Plus, the last mile is a narrow ledge clinging to the mountainside, so hope you don't meet anyone coming the other way.
Keep in mind, this road's a no-go in winter thanks to the snow. Aim for July or August for the best shot at getting through. But trust me, if you make it, the views are epic. You'll reach the ghost town of Boulder City and a stunning, secluded alpine lake. Totally worth the white-knuckle drive!
Road Details
- Country
- Usa
- Continent
- north-america
- Length
- 9.17 km
- Max Elevation
- 2,987 m
- Difficulty
- hard
Related Roads in north-america
extremePeon Pass
🇺🇸 Usa
Alright, adventure seekers, listen up! Peon Pass in Colorado's Saguache County is calling your name! This isn't your average Sunday drive; we're talking about a legit high-mountain experience peaking at 10,357 feet! You'll find it nestled deep within the Gunnison National Forest, accessible via County Road 31CC. Now, fair warning: this isn't paved paradise. It's a gravel 4x4 track, so leave the low-riders at home. Expect a bit of a rocky, muddy ride, but that's part of the fun, right? Keep a close eye on the weather! This route can get seriously dicey with avalanches, heavy snowfall, and landslides, especially with sneaky ice patches lurking about. But if you're prepared and the conditions are right, you're in for some killer views! Get ready for some seriously stunning scenery that'll make all those bumps worthwhile.
hardSouth Summit Ridge
🇺🇸 Usa
South Summit Ridge is a high mountain peak at an elevation of 3.483m (11,427ft) above the sea level, located in Garfield County, Utah, United States. It's one of the highest mountains roads of Utah. The road to the summit, located within the Henry Mountains, is gravel, rocky, tippy and bumpy at times. The road is impassable in winters. Great trail for experienced wheelers. Avoid driving in this area if unpaved mountain roads aren't your strong point. 4x4 required. Stay away if you're scared of heights. Expect a trail pretty steep. Wet conditions may make for tough driving along the muddy road. At the summit there’s a lookout and a broken communication antenna. Missouri’s Most Accident-Prone Roads Revealed Embark on a journey like never before! Navigate through our to discover the most spectacular roads of the world Drive Us to Your Road! With over 13,000 roads cataloged, we're always on the lookout for unique routes. Know of a road that deserves to be featured? Click to share your suggestion, and we may add it to dangerousroads.org.
extremeConclusion: Strategic Vigilance on SR 99
🇺🇸 Usa
State Route 99 (SR 99), which carves through California’s Central Valley, holds the somber distinction of being ranked as the most dangerous highway in the United States. Despite being shorter than the major Interstates, it leads the nation in fatal accidents per 100 miles. A combination of outdated structural design, insufficient lighting, and high-velocity commercial transit makes this 400-mile stretch a high-consequence environment for any driver. SR 99 Technical Risk Profile 62 fatal accidents per 100 miles Sacramento, Stockton, Modesto, Fresno Lack of lighting (40% of nighttime fatalities) 70 MPH (Exceeds standard CA 65 MPH limit) Infrastructure and Design Flaws The primary reason for the high mortality rate on Highway 99 is its outdated infrastructure. Originally designed for lower traffic volumes, the road is now a major corridor for heavy commercial trucks and passenger vehicles. The lack of adequate lighting is a decisive factor: statistical data reveals that nearly 25.5 incidents per 100 miles occur during nighttime in unlit sections. In the last five years, 40% of all fatal collisions on this route took place in total darkness. Heavy Vehicle Dynamics and Collision Factors Federal Motor Carrier Safety Administration (FMCSA) , fatal collisions involving heavy trucks (above 10,000 lbs) on SR 99 are often the result of cumulative factors rather than sudden events. On this specific corridor, the most frequent causes include: Semi-trucks failing to decelerate for sudden traffic jams near urban nodes like Fresno and Fowler. Improper Load Management: Shifting loads affecting vehicle stability in narrow lanes. Long-haul transit through the Central Valley leads to lapses in situational awareness. The "Speed vs. Geometry" Paradox Interestingly, Highway 99 has a posted speed limit of 70 MPH, which is higher than the typical 65 MPH limit found on most California highways. This high speed, combined with a narrow and aging road structure, leaves zero margin for error. When high-velocity transit meets the dense fog frequent in the Central Valley (Tule fog), the probability of multi-vehicle pile-ups increases exponentially. Critical Incident Zones: The Fresno-Fowler Sector Data indicates that the highest fatality rates are concentrated in the Fresno County sector. Urban expansion has placed immense pressure on the SR 99 interchanges, leading to aggressive lane merging and "rear-end" collisions involving heavy freight. In 2016, a series of high-profile accidents—including a fatal semi-truck collision near Fowler—underscored the lethal consequences of following too closely in areas of fluctuating traffic density. Conclusion: Strategic Vigilance on SR 99 Navigating Highway 99 requires more than basic driving skills; it requires an understanding of the road's technical limitations. The combination of darkness, high speed limits, and a high volume of commercial traffic makes it the most volatile corridor in the American highway system. For drivers in Central California, situational awareness and strict adherence to following distances are the only ways to mitigate the inherent risks of this outdated arterial. Road Trip Guide: Conquering Barker Pass in California The Ultimate Guide to Traveling the Kelso Dunes Road in California Embark on a journey like never before! Navigate through our to discover the most spectacular roads of the world Drive Us to Your Road! With over 13,000 roads cataloged, we're always on the lookout for unique routes. Know of a road that deserves to be featured? Click to share your suggestion, and we may add it to dangerousroads.org.
hardA steep unpaved road to Mount Graham in Arizona
🇺🇸 Usa
Okay, adventure seekers, listen up! You absolutely HAVE to check out Mount Graham in Arizona. Nestled in Graham County, this peak soars to a whopping 10,472 feet, making it one of Arizona’s highest drives. Find it northeast of Tucson, chilling in the Coronado National Forest. Word is they started carving a road to the top way back in the '20s! Now, heads up: the road to the very top is all dirt, so you'll want an SUV for this one. It's called Mt. Graham International Observatory Road (4567) and leads to the Mount Graham International Observatory, built in '93. Keep in mind, the road usually closes between November 15th and April 15th. Plus, the very tippy-top has been kinda off-limits to the public for a while now. The climb is a beast! From the paved AZ-366, it's just about 2 miles to the top, but get ready for seven seriously tight hairpin turns! You'll climb nearly 900 feet in elevation – that's an average grade of over 8%! Get ready for incredible views!