U.S. Route 34 (US 34) is a part of the U.S. Highway System that travels from Granby, Colorado, to Berwyn, Illinois.

It then follows the Colorado River Valley near Lake Granby and enters Arapaho National Recreation Area.

[4] This section of US 34 requires a $30 national park entrance fee, making this segment into a toll road.

From here, it passes by Estes Park, has a business route, and then continues east through Big Thompson Canyon before entering Loveland as Eisenhower Boulevard, becoming a four-lane expressway.

At Greeley, it passes by U.S. Highway 85 in a complex interchange[2] and U.S. 34 Business, and crosses the South Platte River.