Interstate 225

Interstate 225
I-225 highlighted in red
Route information
Auxiliary route of I-25
Maintained by CDOT
Length	11.959 mi[1] (19.246 km)
Existed	1976[2]–present
NHS	Entire route
Major junctions
South end	I-25 / US 87 in Denver
Major intersections	I-70 BL / US 40 / US 287 in Aurora
North end	I-70 / US 36 in Aurora and Denver
Location
Country	United States
State	Colorado
Counties	Denver, Arapahoe, Adams
Highway system
Interstate Highway System Main Auxiliary Suffixed Business Future Colorado State Highway System Interstate US State Scenic
← SH 224 → SH 227

Interstate 225 (I-225) is an auxiliary Interstate Highway in the U.S. state of Colorado. The freeway is a 11.959-mile-long (19.246 km) connector spur route of I-25 that acts as an eastern bypass in the Denver metropolitan area and serves Aurora. It also provides direct access to Denver International Airport for the Denver Tech Center and the southern suburbs of Denver. I-225 is one of the two existing auxiliary Interstate Highways in Colorado and it is the only auxiliary route of I-25, as there are no auxiliary routes for I-25 in New Mexico and Wyoming. The route begins at I-25 in the Denver Tech Center and runs north to I-70 north of Aurora. It interchanges with State Highway 83 (SH 83), SH 30 and I-70 Business/US 40/US 287, known locally as Colfax Avenue. The freeway was first proposed in the 1950s along with the first Interstate Highways within Denver. Construction did not begin until 1964 at the I-70 interchange and proceeded south through Aurora until final completion in early 1976 with the final link to I-25 opening to traffic.