Oklahoma State Highway 99
State Highway 99 (SH-99) is a north–south state highway through central Oklahoma. It runs from the Texas state line at Lake Texoma to the Kansas state line near Lake Hulah. It is long. The highway overlaps U.S. Highway 377 (US-377) for over half its length. SH-99 continues as K-99 after crossing the border into Kansas. This road continues for to the Nebraska border, where it becomes Nebraska Highway 99, which lasts an additional . Thus, SH-99 is part of a triple-state highway numbered "99", which lasts a total of . SH-99 began as SH-48, a short highway connecting Ada to Holdenville. This highway was gradually expanded until it became a border-to-border route. In 1938, it was renumbered to match K-99, which was renumbered from K-11 the same day. Route description US-377/SH-99 US-377 crosses Lake Texoma on a bridge from Grayson County, Texas into Marshall County, Oklahoma. This is the southern terminus of SH-99, which will overlap with US-377 all the way to the U.S. Highway's northern terminus in Stroud, a distance of . The highways' first junction in Oklahoma is with SH-32 south of Madill. north of this intersection, US-377/SH-99 serves as the northern terminus for SH-99C, a child route