Route description

SH 42 runs 4.9 miles (7.9 km), starting at a junction with SH 7

Colorado State Highway 7

State Highway 7 in the U.S. state of Colorado is a state highway. Approximately long, it is located in the north-central portion of the state, traversing the mountains on the east of the continental divide south of Estes Park as well as portions of the Colorado Piedmont north of Denver...

 also known as Baseline Road. The highway goes south to Louisville

Louisville, Colorado

Louisville is a Home Rule Municipality in Boulder County, Colorado, United States. The population was 18,937 at the 2000 census. Louisville began as a rough mining community in 1877, suffered through a period of extraordinary labor violence early in the 20th century, and then, when the mines...

 then turns east, crossing Coal Creek and ending at and a junction with US-287.

Major intersections

The entire route is in Boulder County

Boulder County, Colorado

Boulder County is the sixth most populous of the 64 counties of the state of Colorado of the United States. The county seat is Boulder. The most populous municipality in the county and the county seat is the City of Boulder...

.
{| class=wikitable
!Location
!Mile
!Destination
!Notes
|-
|
|0.000
|
|
|-
|
|4.876
|
|