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U.S. Route 81 AI simulator
(@U.S. Route 81_simulator)
Hub AI
U.S. Route 81 AI simulator
(@U.S. Route 81_simulator)
U.S. Route 81
U.S. Route 81 or U.S. Highway 81 (US 81) is a major north–south U.S. highway that extends for 1,220 miles (1,960 km) in the central United States and is one of the original United States Numbered Highways established in 1926 by the American Association of State Highway Officials.
The route of US 81 follows that of the old Meridian Highway (so called because it roughly followed the Sixth Principal Meridian of the US Public Land Survey System) which dates back as early as 1911. The highway has alternately (and unofficially) been known as part of the Pan-American Highway. In the segment in the state of Oklahoma, the highway closely corresponds to the old Chisholm Trail for cattle drives from Texas to railheads in Kansas in the 1860s and 1870s.
As of 2025, the highway's northern terminus is just north of Pembina, North Dakota, at the Canadian border. At this point, it is routed along Interstate 29 (I-29) and continues northward into Manitoba on Highway 75, which leads to Winnipeg.
Its southern terminus is in Fort Worth, Texas, at an intersection with I-35W and US 287. From the route's first year of existence to 1991, US 81's southern terminus was at the Mexican border in Laredo, Texas. In 1991, the terminus was truncated to San Antonio. The route was shortened again to its present length of 1,234 miles (1,986 km) in 1993, when the terminus was moved to Fort Worth. In both cases, the dropped portions of US 81 were replaced by I-35.[citation needed] Portions of former US 81 south of Fort Worth continue to exist as business loops of I-35; a section from Hillsboro to Fort Worth exists as State Highway 81.
The decommissioning of portions of US 81 that have been displaced by concurrent Interstate Highways means that US 81 no longer extends from the Canadian border to the Mexican border, while one of its auxiliary routes, US 281 does extend to both borders. As a result of decommissioning portions of US 81, the length of US 81 is actually 672 miles (1,081 km) miles shorter than US 281.
US 81 at its inception in 1926 followed the route of State Highway 2, which began in Laredo and passed through San Antonio, Austin, Waco, and Fort Worth before passing over the Red River into Oklahoma four miles (6.4 km) north of Ringgold. The 1936 Official Map of the Highway System of Texas clearly shows the route labeled both as US 81 and SH 2. It was cosigned with US 83 for 18 miles (29 km) from Laredo to two miles (3.2 km) south of Webb, with US 79 for 18 miles (29 km) from Austin north to Round Rock, and with US 77 for 33 miles (53 km) from Waco to Hillsboro. In 1940 US 287 was extended south into Texas, and a 67-mile (108 km) stretch from Fort Worth northwest to Bowie was cosigned with US 81. The summer 1941 Texas Highway Map shows this pairing, and the current southern terminus of US 81 is still cosigned with US 287.
The spring and summer 1949 Texas Highway Department Official Map designates the length of US 81 from Laredo to Fort Worth as part of the National System of Interstate Highways, but no numeric designation was given.
It was not until 1959 that parts of US 81 in Texas appeared on the Texas Official Highway Travel Map cosigned with I-35 shields. Succeeding maps reflect the slow completion of I-35 and I-35W over the stretch of US 81 between Laredo and Fort Worth, with the 1978-79 Texas Official Highway Travel Map showing only a 14-mile (23 km) section from Encinal north to three miles (4.8 km) south of Artesia Wells as incomplete, and the 1980 Texas Official Highway Travel Map showing that section completed. In 1980, US 81 was cosigned with I-35 and I-35W except where the Interstate bypassed towns, with US 81 providing the main route through town and then reconnecting with I-35 on the other side. The longest section of US 81 in 1980 not cosigned with the Interstate ran from I-35 in Hillsboro 20 miles (32 km) north to I-35W, just north of Grandview.
U.S. Route 81
U.S. Route 81 or U.S. Highway 81 (US 81) is a major north–south U.S. highway that extends for 1,220 miles (1,960 km) in the central United States and is one of the original United States Numbered Highways established in 1926 by the American Association of State Highway Officials.
The route of US 81 follows that of the old Meridian Highway (so called because it roughly followed the Sixth Principal Meridian of the US Public Land Survey System) which dates back as early as 1911. The highway has alternately (and unofficially) been known as part of the Pan-American Highway. In the segment in the state of Oklahoma, the highway closely corresponds to the old Chisholm Trail for cattle drives from Texas to railheads in Kansas in the 1860s and 1870s.
As of 2025, the highway's northern terminus is just north of Pembina, North Dakota, at the Canadian border. At this point, it is routed along Interstate 29 (I-29) and continues northward into Manitoba on Highway 75, which leads to Winnipeg.
Its southern terminus is in Fort Worth, Texas, at an intersection with I-35W and US 287. From the route's first year of existence to 1991, US 81's southern terminus was at the Mexican border in Laredo, Texas. In 1991, the terminus was truncated to San Antonio. The route was shortened again to its present length of 1,234 miles (1,986 km) in 1993, when the terminus was moved to Fort Worth. In both cases, the dropped portions of US 81 were replaced by I-35.[citation needed] Portions of former US 81 south of Fort Worth continue to exist as business loops of I-35; a section from Hillsboro to Fort Worth exists as State Highway 81.
The decommissioning of portions of US 81 that have been displaced by concurrent Interstate Highways means that US 81 no longer extends from the Canadian border to the Mexican border, while one of its auxiliary routes, US 281 does extend to both borders. As a result of decommissioning portions of US 81, the length of US 81 is actually 672 miles (1,081 km) miles shorter than US 281.
US 81 at its inception in 1926 followed the route of State Highway 2, which began in Laredo and passed through San Antonio, Austin, Waco, and Fort Worth before passing over the Red River into Oklahoma four miles (6.4 km) north of Ringgold. The 1936 Official Map of the Highway System of Texas clearly shows the route labeled both as US 81 and SH 2. It was cosigned with US 83 for 18 miles (29 km) from Laredo to two miles (3.2 km) south of Webb, with US 79 for 18 miles (29 km) from Austin north to Round Rock, and with US 77 for 33 miles (53 km) from Waco to Hillsboro. In 1940 US 287 was extended south into Texas, and a 67-mile (108 km) stretch from Fort Worth northwest to Bowie was cosigned with US 81. The summer 1941 Texas Highway Map shows this pairing, and the current southern terminus of US 81 is still cosigned with US 287.
The spring and summer 1949 Texas Highway Department Official Map designates the length of US 81 from Laredo to Fort Worth as part of the National System of Interstate Highways, but no numeric designation was given.
It was not until 1959 that parts of US 81 in Texas appeared on the Texas Official Highway Travel Map cosigned with I-35 shields. Succeeding maps reflect the slow completion of I-35 and I-35W over the stretch of US 81 between Laredo and Fort Worth, with the 1978-79 Texas Official Highway Travel Map showing only a 14-mile (23 km) section from Encinal north to three miles (4.8 km) south of Artesia Wells as incomplete, and the 1980 Texas Official Highway Travel Map showing that section completed. In 1980, US 81 was cosigned with I-35 and I-35W except where the Interstate bypassed towns, with US 81 providing the main route through town and then reconnecting with I-35 on the other side. The longest section of US 81 in 1980 not cosigned with the Interstate ran from I-35 in Hillsboro 20 miles (32 km) north to I-35W, just north of Grandview.
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