SH 139 begins in the south at exit 15 of I-70 at Loma roughly fifteen miles west of Grand Junction.

From there the road proceeds northward through very remote, very sparsely populated land to its northern end at SH 64 at Rangely.

Near its midpoint, the road crosses the Book Cliffs at Douglas Pass at an elevation of 8,268 ft (2,520 m).

The route was paved from Loma to Douglas Pass in 1972, when the southern terminus was extended to I-70.

[2] Media related to Colorado State Highway 139 at Wikimedia Commons