State Highway 128 (SH 128) is a long state highway in the

Denver Denver () is a consolidated city and county, the capital, and most populous city of the U.S. state of Colorado. Its population was 715,522 at the 2020 census, a 19.22% increase since 2010. It is the 19th-most populous city in the Unit ...

Colorado Colorado (, other variants) is a state in the Mountain states, Mountain West subregion of the Western United States. It encompasses most of the Southern Rocky Mountains, as well as the northeastern portion of the Colorado Plateau and the wes ...

metro area. SH 128's western terminus is at SH 93 south of Boulder, and the eastern terminus is at Interstate 25 (I-25) in

Westminster Westminster is an area of Central London, part of the wider City of Westminster. The area, which extends from the River Thames to Oxford Street, has many visitor attractions and historic landmarks, including the Palace of Westminster, B ...

Route description

The route begins in the west at a junction with SH 93 roughly thirteen miles south of Boulder. From there, the road proceeds eastward into the northern portions of the

metropolitan area. The road passes through portions of the cities of Superior, Broomfield, Northglenn, and

and crosses SH 121 before being split by a section of concurrency with U.S. Route 287 (US 287) and again resuming its course towards its eastern terminus at exit 223 of

I-25 Interstate 25 (I-25) is a major Interstate Highway in the western United States. It is primarily a north–south highway, serving as the main route through New Mexico, Colorado, and Wyoming. I-25 stretches from I-10 at Las Cruces, New Mexic ...

in the city limits of Westminster. there is a brief gap of much less than a mile between the junction of SH 128 and SH 121 and the junction of SH 121 and US 287 that is not even nominally part of SH 128. This gap is due to be closed in 2018 by a mile-long connector that began construction in 2009; there was a five-year hiatus from 2010 to 2015 during negotiations with

BNSF BNSF Railway is one of the largest freight railroads in North America. One of seven North American Class I railroads, BNSF has 35,000 employees, of track in 28 states, and nearly 8,000 locomotives. It has three transcontinental routes that ...

. When construction is complete, the total end-to-end length, including the section that is nominally concurrent with US 287, will be .

History

The route was established in the early 1920s, when it began at Federal Boulevard and ended at SH 185 (now deleted). A section from

US 85 U.S. Route 85 (US 85) is a north–south United States Highway that travels in the Mountain and Northern Plains states of the United States. The southern terminus of the highway is at the Mexican border in El Paso, Texas, connecting wi ...

US 6 U.S. Route 6 (US 6), also called the Grand Army of the Republic Highway, honoring the American Civil War veterans association, is a main route of the U.S. Highway system. While it currently runs east-northeast from Bishop, California, to ...

was added by 1939 and deleted by 1949. The west terminus was extended from

US 36 U.S. Route 36 (US 36) is an east–west United States highway that travels approximately from Rocky Mountain National Park, Colorado to Uhrichsville, Ohio. The highway's western terminus is at Deer Ridge Junction, an intersection i ...

to Indiana Street in 1965 and to its current terminus at SH 93 two years later.

Major intersections

Notes

References

External links

{{Attached KML 128 Transportation in Boulder County, Colorado Transportation in Broomfield County, Colorado Transportation in Adams County, Colorado Thornton, Colorado