Colorado State Highway 121

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State Highway 121 marker

State Highway 121
Map of north central Colorado with SH 121 highlighted in red
Route information
Maintained by CDOT
Length: 30.425 mi[1] (48.964 km)
Major junctions
South end: Waterton Road near Littleton
North end: US 287 in Broomfield
Counties: Jefferson, Denver, Broomfield
Highway system
Colorado State Highways
SH 120 SH 125

State Highway 121 is a 30.425 mile (48.96 km) long state highway in the U.S. state of Colorado.

Route description[edit]

The route, also known as Wadsworth Boulevard, Wadsworth Bypass, and Wadsworth Parkway, starts at a junction with Waterton Road in unincorporated Jefferson County (near Littleton and at the entrance to the main plant of Lockheed Martin Space Systems) and ends at the junction of U.S. Route 36, U.S. Route 287, and State Highway 128 in Broomfield at a trumpet interchange. State Highway 121 passes through portions of southwest Denver County.


Wadsworth Boulevard (Colorado Highway 121) at Bowles Ave. in Littleton, Colorado.

The name Wadsworth comes from Benjamin Franklin Wadsworth, one of the founders and first postmaster of Arvada. In northwest Arvada, Wadsworth Boulevard passes over Hackberry Hill at the site where a landmark hackberry tree, for which the hill was named, stood before it was cut down to make room for the highway in 1937. [2]

Major intersections[edit]

County Location mi km Destinations Notes
Jefferson 0.00 0.00 Waterton Road Southern terminus
4.41 7.10 SH 470 Interchange
Lakewood 7.49 12.05 US 285 (Hampden Avenue) Interchange
9.06 14.58 SH 8 west (Morrison Road) Eastern terminus of SH 8
12.44 20.02 US 6 (Sixth Avenue) Interchange
13.59 21.87 US 40 / I-70 Bus. (Colfax Avenue)
Arvada 16.79 27.02 I-70 / I-76 east – Denver, Fort Morgan, Grand Junction Exit 269A on I-70; exit 1A on I-76
City and County of Broomfield 25.82 41.55 SH 128 west (Interlocken Loop)
26.02 41.88 US 36 – Denver, Boulder Interchange
26.42 42.52 US 287 Interchange; northern terminus, carries highway north.
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  1. ^ "Segment list for SH 121". Retrieved 2007-05-12. 
  2. ^ "Jefferson County, Colorado Place Names Directory". Retrieved 2012-03-23. 

External links[edit]

KML is from Wikidata