Which state has the highest (altitude) continuous paved road in the United States?
Peaking at 12,183 feet (2 miles above sea level), Trail Ridge Road runs 48 miles between Grand Lake and Estes Park. Work was completed on the "highway to the sky" in 1933 after four years of an off-and-on construction schedule that was largely determined by high-elevation weather conditions. Eleven miles of the road are above the tree line, offering spectacular, sweeping views of the park’s alpine forests, tundra, and meadows. - Mental Floss
Trail Ridge Road, Rocky Mountain National Park's heavily traveled highway to the sky, inspired awe before the first motorist ever traveled it. "It is hard to describe what a sensation this new road is going to make," predicted Horace Albright, director of the National Park Service, in 1931 during the road's construction. "You will have the whole sweep of the Rockies before you in all directions."
The next year, Rocky Mountain National Park's lofty wilderness interior was introduced to the first travelers along an auto route the Rocky Mountain News called a "scenic wonder road of the world." - NPS