Colorado State Highway 121

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State Highway 121

Wadsworth Boulevard
Map of north central Colorado with SH 121 highlighted in red
Route information
Maintained by CDOT
Length30.425 mi[1] (48.964 km)
Major junctions
South endWaterton Road near Littleton
Major intersections
North end US 287 in Broomfield
CountryUnited States
CountiesJefferson, Denver, Broomfield
Highway system
  • Colorado State Highway System
SH 120 SH 125

State Highway 121 (SH 121) is a 30.425 mile (48.96 km) long state highway in the U.S. state of Colorado. SH 121's southern terminus is at Waterton Road near Littleton, and the northern terminus is at U.S. Route 287 (US 287) in Broomfield.

Route description

End of SH 121 just before Waterton Road

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

Jefferson0.000.00Waterton RoadSouthern terminus
4.417.10 SH 470C-470 Exit 13; Interchange;
Lakewood7.4912.05 US 285 (Hampden Avenue)Interchange
SH 8 west (Morrison Road)
Eastern terminus of SH-8
12.4420.02 US 6 (Sixth Avenue)Interchange
13.5921.87 US 40 / I-70 BL (Colfax Avenue)
I-70 / I-76 east – Denver, Fort Morgan, Grand Junction
I-76 exit 1a; I-70 exit 269a
City and County of Broomfield25.8241.55 SH 128 (Interlocken Loop)
26.0241.88 US 36 – Denver, BoulderInterchange
26.4242.52 US 287Interchange; Northern terminus, Road continues north as US-287.
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


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

External links

Media related to Colorado State Highway 121 at Wikimedia Commons