Route description

The original alignment of US 366 began at the international border between the U.S and Mexico in El Paso County. The route followed SH 33 and intersected US 80

U.S. Route 80

U.S. Route 80 is an east–west United States highway, much of which was once part of the early auto trail known as the Dixie Overland Highway. As the "0" in the route number indicates, it was originally a cross-country route, from the Atlantic to the Pacific...

 in El Paso. US 366 then went northeast to Newman

Newman, Texas

Newman is a place in El Paso County, Texas, United States of America, some 16 miles north-east of the city of El Paso. In 1990 it had a population of about 60 people....

 where it crossed the state line.

In New Mexico, US 366 passed through Orogrande in Otero County

Otero County, New Mexico

-2010:Whereas according to the 2010 U.S. Census Bureau:*72.7% White*3.5% Black*6.7% Native American*1.2% Asian*0.2% Native Hawaiian or Pacific Islander*4.2% Two or more races*11.2% Other races*34.5% Hispanic or Latino -2000:...

 and then merged with in Alamogordo and intersected further north. The route intersected and separated from NM 3. The highway then went to the northeast intersecting . The route then crossed into Lincoln County

Lincoln County, New Mexico

-2010:Whereas according to the 2010 U.S. Census Bureau:*85.1% White*0.5% Black*2.4% Native American*0.4% Asian*0.0% Native Hawaiian or Pacific Islander*2.5% Two or more races*9.1% Other races*29.8% Hispanic or Latino -2000:...

 where it intersected and then turned west intersecting US 566 in Hondo. In Chaves County

Chaves County, New Mexico

-2010:Whereas according to the 2010 U.S. Census Bureau:*70.9% White*2.0% Black*1.2% Native American*0.6% Asian*0.1% Native Hawaiian or Pacific Islander*3.2% Two or more races*22.0% Other races*52.0% Hispanic or Latino -2000:...

, the highway turned north along NM 2 and intersected NM 13. A short distance north of Roswell the route turned northwest off of NM 2 and passed through Acme. In Kenna

Kenna, New Mexico

Kenna is a small unincorporated village in Roosevelt County, New Mexico, United States. It is located on U.S. Route 70, 30 miles southwest of Portales. The settlement was originally known as Urton, probably named for two brothers who came to the region from the state of Missouri in 1884...

, the highway entered Roosevelt County

Roosevelt County, New Mexico

-2010:Whereas according to the 2010 U.S. Census Bureau:*76.9% White*1.8% Black*1.3% Native American*0.9% Asian*0.0% Native Hawaiian or Pacific Islander*3.2% Two or more races*15.9% Other races*39.9% Hispanic or Latino -2000:...

 where it intersected and then merged with NM 18 in Portales. The route then turned north and entered Curry County

Curry County, New Mexico

Curry County is a county located in the U.S. state of New Mexico. The population was approximately 45,044 at the 2000 census. Its county seat is Clovis. It is named in honor of George Curry, territorial governor of New Mexico from 1907 to 1910...

. In Clovis, the route turned east off of NM 18 and on to US 70 and crossed the state line back into Texas.

At the state line, US 366 reacquired its secondary SH 33 and entered Farwell in Parmer County where it separated from US 70 and headed northeast. The route intersected and passed through Friona

Friona, Texas

Friona is a city in Parmer County, Texas, United States. The population was 3,854 at the 2000 census. Friona was established in 1906, originally called Frio the Spanishword for cold....

 before crossing into Deaf Smith County where it passed through Hereford

Hereford, Texas

Hereford is a city in Deaf Smith County, Texas, United States. The population was 14,597 at the 2000 census. It is the only incorporated Hereford in the country. It is the county seat of Deaf Smith County....

. In Randall County, the highway joined the combined route of US 385 and . US 366 then went north to Amarillo where it entered Potter County. In Amarillo, the route merged with the combined route of US 370 and before ending at US 66 and .

The segment of US 366 from El Paso to the state line was fully paved. In New Mexico, the route was classified in 1930 as a first class road for use all year. Most of the roadway in New Mexico was gravel; however, there was a fully paved segment between Roswell and Acme. Most of the roadway between Ruidoso and Hondo was merely graded as were two short segments between Acme and Kenna and between Elida and Portales. As late as 1933, most of the route in the Texas Panhandle

Texas Panhandle

The Texas Panhandle is a region of the U.S. state of Texas consisting of the northernmost 26 counties in the state. The panhandle is a rectangular area bordered by New Mexico to the west and Oklahoma to the north and east...

 was only graded, although the portion between the Deaf Smith-Randall county line to Amarillo was paved.

Major intersections

In El Paso County, Texas:

• U.S.-Mexico border

In New Mexico:

In the Texas Panhandle:

Route description

The final alignment of US 366 began at the intersection of NM 6 with the combined routes US 66 and US 85 at Albuquerque in Bernalillo County

Bernalillo County, New Mexico

-2010:Whereas according to the 2010 U.S. Census Bureau:*69.4% White*3.0% Black*4.8% Native American*2.3% Asian*0.1% Native Hawaiian or Pacific Islander*4.4% Two or more races*16.0% Other races*47.9% Hispanic or Latino -2000:...

. The route proceeded to the east along NM 6 and intersected . The route then passed through Barton and then crossed the southwestern corner of Santa Fe County

Santa Fe County, New Mexico

-2010:Whereas according to the 2010 U.S. Census Bureau:*76.2% White*0.9% Black*3.1% Native American*1.2% Asian*0.1% Native Hawaiian or Pacific Islander*3.6% Two or more races*14.9% Other races*50.6% Hispanic or Latino -2000:...

. The route then entered Torrance County

Torrance County, New Mexico

-2010:Whereas according to the 2010 U.S. Census Bureau:*76.1% White*1.3% Black*2.3% Native American*0.4% Asian*0.0% Native Hawaiian or Pacific Islander*4.3% Two or more races*15.6% Other races*39.1% Hispanic or Latino -2000:...

 where the route intersected NM 41 at Moriarty. The route then turned south along NM 41 and passed through Estancia

Estancia, New Mexico

Estancia is a town in Torrance County, New Mexico, in the United States. As of the 2000 census, the town population was 1,584. It is the county seat of Torrance County.Estancia is part of the Albuquerque Metropolitan Statistical Area.-History:...

before terminating at US 60 just west of Willard.

The 1930 state highway map described the route as a first class road usable all year. From Albuquerque to a point just west of Tijeras, the highway had an oiled and concrete surface. From that point to Barton, the highway had a gravel surface. From Barton to Moriarty, the surface was graded, and the surface was graves beyond Moriarty to Willard.