Louisiana State Route 1 ran 452.7 miles (728.6 km) in a north–south direction from Pointe à la Hache to the Texas state line near Greenwood. The route was designated along the Jefferson Highway, an auto trail that ran from New Orleans to Winnipeg.
In 1926, US 71, US 171, and US 80 were overlaid on SR 1 from Baton Rouge to Clarence, Belmont to Shreveport, and Shreveport to the Texas state line, respectively. While the routes were signed concurrently, the state route designations were removed in the 1955 Louisiana Highway renumbering.
Louisiana State Route 2 ran 319.6 miles (514.3 km) in an east–west direction from the Texas state line via Lake Charles, Lafayette, Morgan City, and New Orleans to the Mississippi state line. The route was designated along the Old Spanish Trail.
In 1926, US 90 was overlaid on most of SR 2. While the route was signed concurrently, the SR 2 designation was removed in the 1955 Louisiana Highway renumbering.
In 1926, the southern segment became part of US 61, and the northern segment became part of US 65 when the numbered U.S. Highway system was created.[3][4] Route 3 remained co-signed with its U.S. counterparts until the 1955 Louisiana Highway renumbering, which eliminated such overlaps.[2] A portion of the route north of Lake Providence bypassed in the 1930s was designated as Route 3-D while it remained in the state highway system.[5]
Louisiana State Route 3-D
State Route 3-D
Existed
1931–1955
Louisiana State Route 3-D ran 8.72 miles (14.03 km) in a north–south direction from US 65/SR 3 north of Lake Providence to US 65/SR 3 at Millikin. It was a portion of SR 3 bypassed in 1931.
Louisiana State Route 4 ran 182.1 miles (293.1 km) in a north–south direction from the Mississippi state line to LA 1 in Shreveport. The route was designated along the Dixie Overland Highway.
In 1926, US 80 was overlaid on the entirety of SR 4. While the route was signed concurrently, the SR 4 designation was removed in the 1955 Louisiana Highway renumbering.
Louisiana State Route 6 ran 163.4 miles (263.0 km) in an east–west direction from the Texas state line at the Sabine River to the Mississippi state line at Vidalia.
In 1934, US 84 was extended on top of the eastern half of SR 6 from the Mississippi state line to Clarence. While the route was signed concurrently, the state route designation was removed in the 1955 renumbering; the western half became the modern LA 6.
Louisiana State Route 7 ran in a west–east direction from the Texas state line at the Sabine River to the Mississippi state line at Bogalusa.
In 1926, US 190 was overlaid on SR 7 from Ripley to the Mississippi state line. While the route was marked concurrently, the SR 7 designation was cancelled in favor of US 190 in the 1955 renumbering. The remainder of SR 7 became LA 12.
Louisiana State Route 8 ran 36.2 miles (58.3 km) in a north–south direction from US 71/SR 55 north of Shreveport to the Texas state line northwest of Rodessa.
Louisiana State Route 14 ran 150.3 miles (241.9 km) in a north–south direction from US 71/US 167/SR 1 in Alexandria to the Arkansas state line near Mer Rouge.
In 1926, US 165 was overlaid on the entirety of SR 14. While the route was signed concurrently, the state route designation was removed in the 1955 renumbering.
Louisiana State Route 14-D
State Route 14-D
Existed
1921–1955
Louisiana State Route 15
State Route 15
Length
110.4 mi (177.7 km)
Existed
1924–1955
Louisiana State Route 15 ran 110.4 miles (177.7 km) in a north–south direction from US 65/US 84/SR 6 in Ferriday to SR 11 in Farmersville.
SR 15 became the modern LA 15 in the 1955 renumbering.
Louisiana State Route 26 ran in a north–south direction from Kaplan to SR 1 (now US 71) near Lecompte. In 1926, US 167 was overlaid on the section from Turkey Creek north to SR 1. SR 26 was extended south to Forked Island at the Gulf Intracoastal Waterway by 1928. While the route was marked concurrently, SR 26 was deleted in favor of US 167 in the 1955 renumbering. The remainder of SR 26 became LA 13 from Turkey Creek to Kaplan and LA 35 from Kaplan to Forked Island.
Louisiana State Route 30-E ran 8.0 miles (12.9 km) in a north–south direction from SR 30 near Lettsworth to a second junction with SR 30 near Simmesport at the Atchafalaya River. It was a portion of SR 30 bypassed in 1928 by a new alignment.
Louisiana State Route 30-F
State Route 30-F
Existed
1928–1955
Louisiana State Route 31
State Route 5
Existed
1921–1955
Louisiana State Route 32
State Route 5
Existed
1921–1955
Louisiana State Route 33
State Route 33
Length
71.3 mi (114.7 km)
Existed
1921–1955
Louisiana State Route 33 ran 71.3 miles (114.7 km) in a north–south direction from South Carollton Avenue in New Orleans to the Mississippi state line near Frenier. The route was part of the proposed Lakeshore Highway, but construction on the section from Kenner to Frenier was abandoned in the early 1930s mainly due to the completion of the Bonnet Carrè Spillway that split the route in half. In 1926, US 51 was overlaid on top of SR 33. While the route was marked concurrently, the state route designation was removed in the 1955 renumbering.
Louisiana State Route 34 ran in a north–south direction from Slidell to the Mississippi state line at Warnerton.
In 1926, US 190 was overlaid on the portion of SR 34 from Covington to Slidell. While the route was marked concurrently, SR 34 was deleted in favor of US 190 in the 1955 renumbering. The remainder of SR 34 became LA 25.
Louisiana State Route 43 ran in a general west–east direction from Breaux Bridge to the Gulf Intracoastal Waterway.
When SR 43 was designated in 1921, it ran from Breaux Bridge to Abbeville. In 1926, the route was extended to the Gulf Intracoastal Waterway south of Abbeville. In 1949, US 167 was overlaid on top of SR 43 from Lafayette to Abbeville. While the route was marked concurrently, SR 43 was deleted in favor of US 167 in the 1955 renumbering. The remainder of SR 43 became LA 94 from Breaux Bridge to Lafayette, LA 82 from Abbeville to Esther and LA 333 from Esther to the Intracoastal Waterway.
^"Act No. 95, House Bill No. 206". State-Times. Baton Rouge. November 29, 1921. p. 9.
^ abcdefghiLouisiana Department of Highways (1955). Louisiana Highways: Interim Road Map (Map). Louisiana Department of Highways.
^United States Numbered Highways, Selected by American Association of State Highway Officials, Approved by United States Department of Agriculture. American Association of State Highway Officials. 1927. pp. 22–23.
^Clason Map Company (1928). Clason's Road Map of Louisiana (Map). Clason Map Company.