| State: | OK |
| Type: | SH |
| Route: | 45 |
| Maint: | ODOT |
| Length Mi: | 64.7 |
| Established: | 1926 |
| Map: | Ok-45 path.png |
| Direction A: | West |
| Direction B: | East |
| Terminus A: | in Waynoka |
| Terminus B: | north of Enid |
| Previous Type: | SH |
| Previous Route: | 44 |
| Next Type: | SH |
| Next Route: | 46 |
State Highway 45 (SH-45 or OK-45) is a state highway in Oklahoma. It runs 64.7miles west-to-east through Woods, Alfalfa and Garfield counties.[1]
SH-45 begins at the US-281/SH-14 junction in Waynoka. The first 12miles of SH-45 heading east out of Waynoka is concurrent with US-281. US-281 then splits off to the north. SH-45 continues east for 12miles to Carmen.[2]
2miles east of Carmen, SH-34 joins SH-8 for a 3miles concurrency to the south, where SH-43 resumes its eastward travel. SH-58 joins SH-43 for a one-mile (1.6 km) concurrency just south of the town of Helena, and at Goltry, SH-45 jogs south a few miles before turning back to the east and heading for a brief concurrency with SH-132 at Carrier. Continuing to the east, SH-45 travels eight more miles (12.9 km) from Carrier, before reaching its terminus at US-60/64/81 at the north edge of Enid.[2]
SH-45 was first added to the state highway system between May 1926 and November 1927. The original routing of the highway was from Waynoka to SH-8 in Carmen.[3]
Before 1963, the section of present-day SH-45 between SH-58 and SH-132 was part of the original SH-38.[4] In 1963, all of this SH-38 west of Carrier was renumbered to SH-45 (a north - south section of SH-38 that connected Carrier to US-60 became part of a SH-132 extension). The same year, SH-45 was extended westward to Waynoka.[5] In either 1971 or 1972, the highway was extended eastward to its present terminus on the northern outskirts of Enid.[6] No major changes have occurred since.