Oklahoma's State Highway 79 begins where Texas's State Highway 79 crosses over the Red River from Clay County, Texas into Jefferson County, Oklahoma.

Beginning in 1939, a multiple-span pony truss bridge carried the highway across the river.

[3] Upon reaching the shore, the highway continues on a northeast trajectory, rising out of the Red River valley.

[4] The highway then comes to an end at US-70 on the southwest outskirts of Waurika.

It has the same extent on that map as it does today, although it had a dirt surface.