State Highway 13 was a state highway

State highway

State highway, state road or state route can refer to one of three related concepts, two of them related to a state or provincial government in a country that is divided into states or provinces :#A...

 in the U.S. state

U.S. state

A U.S. state is any one of the 50 federated states of the United States of America that share sovereignty with the federal government. Because of this shared sovereignty, an American is a citizen both of the federal entity and of his or her state of domicile. Four states use the official title of...

 of Texas

Texas

Texas is the second largest U.S. state by both area and population, and the largest state by area in the contiguous United States.The name, based on the Caddo word "Tejas" meaning "friends" or "allies", was applied by the Spanish to the Caddo themselves and to the region of their settlement in...

 that ran from Amarillo

Amarillo, Texas

Amarillo is the 14th-largest city, by population, in the state of Texas, the largest in the Texas Panhandle, and the seat of Potter County. A portion of the city extends into Randall County. The population was 190,695 at the 2010 census...

 due west to the New Mexico

New Mexico

New Mexico is a state located in the southwest and western regions of the United States. New Mexico is also usually considered one of the Mountain States. With a population density of 16 per square mile, New Mexico is the sixth-most sparsely inhabited U.S...

 border near Glenrio, Texas

Glenrio, Texas

Glenrio is an unincorporated community in both Deaf Smith County, Texas, and Quay County, New Mexico, in the United States. Located on Route 66, it sits on the Texas/New Mexico state line...

.

SH 13 was one of the original twenty-six state highways proposed in 1917, overlaid on top of the Ozark Trail. From 1917 the routing mostly followed present-day United States Highway 60 from Farwell

Farwell, Texas

Farwell is a city in and the county seat of Parmer County, Texas, United States. Farwell is located on the Texas-New Mexico border with the town of Texico, New Mexico on the opposite side...

 through Amarillo to Pampa

Pampa, Texas

Pampa is a city in Gray County, Texas, United States. The population was 17,887 at the 2000 census. It is the county seat of Gray County.Pampa is the principal city of the Pampa Micropolitan Statistical Area, which includes all of Gray and Roberts counties....

. From there, the highway turned east on present-day SH 152

Texas State Highway 152

State Highway 152 or SH 152 is a Texas state highway that runs from Dumas east to the Oklahoma border. The route was originally designated circa 1933 between Pampa and Wheeler, but was extended both west and east to its current termini in 1938.-Route description:SH 152 begins at an intersection...

 to the border near Wheeler

Wheeler, Texas

Wheeler is a city in Wheeler County, Texas, United States, situated on the eastern edge of the Texas Panhandle. Both the city and the county are named for Royal Tyler Wheeler, a chief justice of the Texas Supreme Court. The population was 1,378 at the 2000 census. It is the county seat of Wheeler...

.

In 1919, SH 13 was completely reassigned to a small segment traveling due west from Amarillo to New Mexico on the route that would later be U.S. Highway 66; the eastern portion of the future US 66 route was added by 1922.

In 1926, US 66 was overlaid on the entire SH 13 route; the routes were marked concurrently, by 1933, the routing had been pulled back to its Amarillo-Endee segment, and by 1939 SH 13 was canceled, and has never been reassigned.