In 1962, the Ohio Department of Highways implemented the system of

Interstate Highways The Dwight D. Eisenhower National System of Interstate and Defense Highways, commonly known as the Interstate Highway System, is a network of controlled-access highways that forms part of the National Highway System in the United States. T ...

that had been approved by the states in 1956. The State Route numbers 70, 71, 74, 75, 77, 80, 90, 270, 271,

275 __NOTOC__ Year 275 ( CCLXXV) was a common year starting on Friday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Aurelianus and Marcellinus (or, less frequently, year 10 ...

, 277, 280,

290 __NOTOC__ Year 290 ( CCXC) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar. In the Roman Empire, it was known as the Year of the Consulship of Valerius and Valerius (or, less frequently, ye ...

, 675, and

680 __NOTOC__ Year 680 ( DCLXXX) was a leap year starting on Sunday (link will display the full calendar) of the Julian calendar. The denomination 680 for this year has been used since the early medieval period, when the Anno Domini calendar era ...

conflicted with new designations, so the State Routes with those numbers were renumbered. However, there is no Interstate 290 in Ohio anymore, so 290 is a possible state route number again.

Other renumberings due to new interstate designations after 1962

*In 1972, due to the designation of I-76 in Ohio, Ohio State Route 76 had the part north of Beverly renumbered to

Ohio State Route 83 State Route 83 is a north–south state highway in the U.S. state of Ohio. Its southern terminus is near the town of Beverly at State Route 60, and its northern terminus is overlooking Lake Erie at U.S. Route 6 in Avon Lake. A portion of SR ...

and the rest became a southward extension of

Ohio State Route 339 State Route 339 (SR 339) is a north–south state highway in southeastern Ohio, a U.S. state. The southern terminus of SR 339 is at SR 618 approximately west of Belpre, and less than south of the U.S. Route 50 (US 50) ...

. *In 1973, due to the designation of I-670 in Ohio, Ohio State Route 670 had the portion east of

Ohio State Route 313 State Route 313 (SR 313, OH 313) is a long east–west state highway located in the southeastern portion of the U.S. state of Ohio. The western terminus of SR 313 is at a T-intersection with SR 146 approximately n ...

become an extension of it and the rest was renumbered to Ohio State Route 761.

References

{{DEFAULTSORT:1962 Ohio State Highway Renumbering Renumbering 1962 Ohio State Highway Renumbering, 1962 State Highway Renumbering, 1962 History of Ohio Highway renumbering in the United States