High-Risk Roads
US 36, Northwest Parkway, SH 121 (Wadsworth Blvd), and I-25
US 36, the Denver-Boulder Turnpike, is the dominant commuter artery through Broomfield. Freezing drizzle that forms thin invisible ice before snow accumulation has produced documented fatal crashes near the Church Ranch Boulevard exit. The Northwest Parkway is a 9.05-mile limited-access toll road with both termini in Broomfield: the western end at US 36 near Interlocken Loop and the eastern end at the I-25 and E-470 interchange. A fatal and serious-injury crash at the southbound I-25 to southbound E-470 ramp was documented in April 2024. SH 121 (Wadsworth Boulevard) and 120th Avenue are flagged in Broomfield's Transportation Plan as high-crash intersections. I-25 and US 87 form Broomfield's eastern boundary and carry heavy north-south freight volume at interchange speeds.