Chicago to Santa Monica
Route 66 is not a road; it is an archaeology project. Officially decertified in 1985, the “Main Street of America” no longer exists on modern federal maps. What remains is a 2,400-mile patchwork of frontage roads, decaying concrete, and business loops that shadow the modern Interstates (I-55, I-44, I-40, I-15).
Driving it today is a navigational challenge. It requires tracing the history of American civil engineering from the mud tracks of the 1920s to the superhighways of the 1950s.
1. The Engineering Oddity: Chain of Rocks Bridge
Location: Illinois/Missouri Border (St. Louis)
Route 66 crossed the Mississippi River via the Chain of Rocks Bridge. Built in 1929, it features a unique 22-degree bend in the middle of the river—a structural necessity to accommodate bedrock geology for the piers.
The Reality: You cannot drive across it anymore, but walking it reveals the narrow lane widths of the 1930s, a stark contrast to the massive I-270 bridge looming nearby.
2. The Pavement Experiment: The Sidewalk Highway
Location: Miami to Afton, Oklahoma
This is arguably the most technically interesting section of the old alignment.
The Engineering: Between 1922 and 1926, funding was scarce. To stretch the budget, Oklahoma built a single, 9-foot wide lane of pavement. Drivers would put their left wheels on the paved strip and right wheels in the dirt—unless passing, where one car had to yield the pavement entirely. A surviving section remains drivable today, offering a tactile history lesson in early automotive travel.
3. The Neon Museum: Tucumcari
Location: New Mexico (Old US 66 Blvd)
While much of Route 66 is dead, Tucumcari is a living museum of mid-century commercial architecture.
The Drive: At night, the Blue Swallow Motel and its neighbors illuminate the desert. This section highlights the “motor court” design era—integrated garages and neon signage designed to catch the eye of drivers moving at 45 mph, before the Interstate bypassed the town and increased speeds to 75 mph.
4. The Technical Pass: Oatman Highway
Location: Arizona (Sitgreaves Pass)
This is the most demanding driving section of the entire route. Before the straight alignment through Yucca was built, Route 66 had to cross the Black Mountains.
The Drive: The road is narrow, lacks shoulders, and features tight, blind switchbacks and steep drop-offs. In the 1930s, travelers would often hire locals to drive their cars over the pass due to fear of heights.
The Hazard: Burros. Wild donkeys roam freely in the town of Oatman and on the highway. They are a road hazard unique to this sector.
5. The Preservation Sector: Seligman to Kingman
Location: Arizona
This is the longest continuous stretch of the old road remaining.
The Experience: Unlike the fragmented sections in the Midwest, here you can drive for over an hour without seeing an Interstate shield. The railway runs parallel, creating the classic “train vs. car” visual. The asphalt is aged and coarse, producing a distinct tire roar that is absent on modern tarmac.
6. The Thermal Limit: The Mojave Desert
Location: California (Needles to Barstow)
Entering California, the route crosses the Mojave.
The Logistics: This section was historically the graveyard of radiators. The climb from the Colorado River is relentless. Today, the challenge is isolation. The town of Amboy (home to Roy’s Motel) is a ghost town. The road surface is rough, cracked by intense heat and neglected maintenance. It is a raw, lonely drive through volcanic crater fields.
