List of Interstate Highways in Louisiana

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Interstate Highways of the Louisiana Highway System
Interstate 10 markerInterstate 220 marker
Highway markers in use for primary interstates (left) and auxiliary interstate (right)
System information
Formed: 1957 (designated);
1960 (signed)
Length: 902.84 mi[1] (1,452.98 km)
Highway names
Interstates: Interstate X (I-X)
System links
  • Louisiana Highway System

The Interstate Highway System in Louisiana consists of 902.84 miles (1,452.98 km)[1] of freeways constructed and maintained by the Louisiana Department of Transportation and Development (La DOTD).


Primary interstates[edit]

Number Length (mi)[1] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
I‑10 274.42 441.64 Texas state line at Orange, TX Mississippi state line east of Slidell 1960 current Southern Louisiana's primary west–east route serving Lake Charles, Lafayette, Baton Rouge, New Orleans, and Slidell
I‑12 85.59 137.74 I-10 in Baton Rouge I-10/I-59 in Slidell 1967 current Northern bypass of New Orleans metropolitan area via Hammond
I‑20 189.87 305.57 Texas state line west of Greenwood Mississippi state line at Vicksburg, MS 1960 current Northern Louisiana's primary west–east route serving Shreveport and Monroe
I‑49 208.25 335.15 I-10/US 167 in Lafayette I-20 in Shreveport 1983 current Louisiana's primary north–south route, connecting I-10 and I-20 via Alexandria; extension under construction from Shreveport north to Arkansas state line
I‑55 65.81 105.91 I-10/US 51 in LaPlace Mississippi state line north of Kentwood 1960 current North–south route in southeastern Louisiana via Hammond
I‑59 11.48 18.48 I-10/I-12 in Slidell Mississippi state line north of Pearl River 1960 current North–south route in southeastern Louisiana via Slidell

Auxiliary interstates[edit]

Number Length (mi)[1] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
I‑110 8.89 14.31 I-10 in Baton Rouge US 61 in Baton Rouge 1960 current Baton Rouge spur; designated as I-410 until 1965
I‑210 12.40 19.96 I-10 west of Lake Charles I-10 east of Lake Charles 1964 current Lake Charles downtown bypass
I‑220 17.62 28.36 I-20/LA 3132 in Shreveport I-20 in Bossier City 1979 current Shreveport–Bossier City downtown bypass
I‑310 11.25 18.11 US 90/LA 3127 in Boutte I-10 west of Kenner 1983 current Spur west of New Orleans
I‑510 3.04 4.89 LA 47 in New Orleans I-10/LA 47 in New Orleans 1992 current Spur in Eastern New Orleans
I‑610 4.52 7.27 I-10 in New Orleans 1965 current New Orleans downtown bypass
I‑910 9.70 15.61 US 90 Bus. in Marrero I-10/US 90 Bus. in New Orleans 1999 current FHWA designation (not used by La DOTD) for freeway portion of US 90 Business and placeholder for future I-49 corridor

Proposed interstates[edit]

Number Length (mi) Length (km) Southern or western terminus Northern or eastern terminus Proposed Cancelled Notes
I-14 Alexandria (undecided) Mississippi state line at Natchez, MS (undecided) 2005 Proposed new route roughly paralleling the existing US 84 corridor
I‑69 Texas state line southwest of Shreveport (undecided) Arkansas state line northeast of Haynesville (undecided) 1991 Proposed extension roughly paralleling the existing US 79 corridor
I‑310 2.70 4.35 US 90 Bus. in New Orleans I-10 in New Orleans 1964 1969 Cancelled Vieux Carré Riverfront Expressway
I‑410 West of Baton Rouge Baton Rouge 1965 1969 Cancelled northern bypass of Baton Rouge using part of Airline Highway corridor
I-10 west of New Orleans I-10 in Eastern New Orleans 1969 1977 Cancelled southern bypass of New Orleans known as the Dixie Freeway; partially built as current I-310 and I-510
I‑420 10.20 16.42 I-20 near Monroe I-20 near Monroe 1959 1964 Cancelled two-lane bypass of Monroe

See also[edit]

References[edit]

  1. ^ a b c d "FHWA Route Log and Finder List". Federal Highway Administration. December 10, 2012. Retrieved May 11, 2013. 

External links[edit]