Bolded cities are officially-designated control cities for signs
Planning for an outerbelt around Columbus began in the late 1950s. The outerbelt was completed in stages, with the south section finished first and the east portion last.
By the early 1960s detailed planning for the route had begun, and several controversies arose. The first involved the location of the northern segment, which was originally planned to pass south of Worthington, passing through the Ohio Deaf School and just north of the then ten year old Graceland Shopping Center. Through vigorous lobbying throughout 1961, and with the help of Ohio Governor Michael DiSalle, residents were able to get the outerbelt relocated to pass north of Worthington.
Another contentious issue involved the routing of the eastern portion of the outerbelt between Port Columbus International Airport and the city of Gahanna. While the airport wanted the outerbelt pushed out towards Gahanna so as to leave land for future runway expansion, the residents of Gahanna wanted it pushed back towards Columbus. The final compromise led to an interesting kink in I-270 as it jogs around the airport.
Construction of the outerbelt began in 1962, and work was begun on various disconnected sections. The first portion to be completed connected U.S. 23 with I-71 south of Columbus. The portion between U.S. 23 and Interstate 71 on the north side opened in August, 1967.
The section between Interstate 70 on the West Side and Interstate 71 on the South Side opened in August, 1970. In late 1970, sections opened on the East Side between U.S. 33 and Interstate 70, and between State Rt. 3 in Westerville and State Rt. 161 on the East Side. It was now possible to bypass Columbus using I-270 by going around the south side of the city.
In June, 1971 the section between Morse Road and State Rt. 161 on the East side opened. In October, 1971, another section on the East Side between Interstate 70 and East Main Street opened. It would take four more years to complete the northeast portion of the outerbelt.
The last section of I-270, on the East Side, between Hamilton Road and East Broad Street, was opened on August 20, 1975. The total cost of the ten year construction project was 175 million dollars, compared to the original 1961 estimate of 104 million dollars.
Massive development followed the construction of I-270, especially around the north and northwest sides. The northern suburbs of Westerville, Worthington and Dublin, and Hilliard to the west benefited the most. As in other sizeable cities across America, the effect of this outerbelt driven development was to hasten the decline of the Columbus core. The south portion of the I-270 was much slower to develop due to the location of sewage treatment and landfill facilities, as well as quarries and the flood prone Scioto River. Grove City began to develop in the 1990s with the addition of office/warehouse space, and the conversion of Rickenbacker Air Force Base to a civilian air freight facility.
|Columbus||5.0||5||Georgesville Rd||WB changes to NB and SB changes to EB|
|7.0||7A||NB combined as Exit 7|
|8.7||8||some signage says Indianapolis instead of Dayton|
|Hilliard||12.6||13A||Fishinger Rd - Upper Arlington||SB combined as Exit 13|
|13B||Cemetery Rd - Hilliard - Franklin County Fairgrounds|
|Columbus||15.6||15||Tuttle Crossing Blvd||The Mall at Tuttle Crossing|
|Dublin||17.3||17A||to "Olde Dublin"; NB changes to EB and WB changes to SB|
|17B||to most of residential Dublin|
|Columbus||19.8||20||Sawmill Rd - Columbus Zoo, Zoombezi Bay, Muirfield (WB)||first SPUI in Ohio|
|Worthington||22.8||22||severe weaving issues; interchanges will be braided in project beginning 2009|
|Columbus||25.8||26||EB formerly split into 26A and 26B|
|27.4||28||eastern terminus of SR 710|
|Westerville||28.7||29||EB changes to SB and NB changes to WB. Route 3 known as State Street north of I-270 and Westerville Road south of I-270|
|Columbus||30.5||30||formerly exits 30A-B; shares CD roads with exit 33|
|32.2||32||Morse Rd||no connection to exits 30 or 33|
|32.9||33||Easton Way - Easton||shares CD roads with exit 30; provides access to Morse Road via Stelzer Road|
|Gahanna||35.4||35A||- Airport||NB exits combined as exit 35; Johnstown Rd exit is NB-exit-only, no entrance|
|Columbus||39.5||39A||Taylor Station Rd exit is NB-exit-only via Old Morrison Rd and Westbourne Ave|
|41.3||41A||exits 41A-43B share CD roads|
|Obetz||49.0||49||Alum Creek Dr - Obetz - Rickenbacker Int'l Airport||SB becomes WB and EB becomes NB|
|Columbus||52.7||52A||EB combined as exit 52|