 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 | |||
   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 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. 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.