List of Interstate Highways in Louisiana

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Interstate Highways of the Louisiana Highway System

Interstate 10 marker

Interstate 220 marker

Highway markers in use for primary interstates (left) and auxiliary interstate (right)
System information
Length933.84 mi[1] (1,502.87 km)
Formed1957 (designated);
1960 (signed)
Highway names
InterstatesInterstate X (I-X)
System links
  • Louisiana State Highway System

The Interstate Highway System in Louisiana consists of 933.84 miles (1,502.87 km)[1] of freeways constructed and maintained by the Louisiana Department of Transportation and Development (La DOTD).

Primary interstates

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 01960-01-011960 current Southern Louisiana's primary east–west 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 01967-01-011967[2] 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 01960-01-011960 current Northern Louisiana's primary east–west route serving Shreveport and Monroe
I-49 239.25 385.04 I-10/US 167 in Lafayette Arkansas state line north of Ida 01983-01-011983 current Louisiana's primary north–south route, connecting I-10 and I-20 via Alexandria; final gap in Shreveport is under construction and southern extension from Lafayette to New Orleans is planned
I-55 65.81 105.91 I-10/US 51 in LaPlace Mississippi state line north of Kentwood 01960-01-011960 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 01960-01-011960 current North–south route in southeastern Louisiana via Slidell

Auxiliary interstates

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 01960-01-011960 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 01964-01-011964 current Lake Charles downtown bypass
I-220 17.62 28.36 I-20/LA 3132 in Shreveport I-20 in Bossier City 01979-01-011979 current Shreveport–Bossier City downtown bypass
I-310 11.25 18.11 US 90/LA 3127 in Boutte I-10 west of Kenner 01983-01-011983 current Spur west of New Orleans
I-510 3.04 4.89 LA 47 in New Orleans I-10/LA 47 in New Orleans 01992-01-011992 current Spur in Eastern New Orleans
I-610 4.52 7.27 I-10 in New Orleans 01965-01-011965 current New Orleans downtown bypass
I-910 9.70 15.61 US 90 Bus. in Marrero I-10/US 90 Bus. in New Orleans 01999-01-011999 current FHWA designation (not used by La DOTD) for freeway portion of US 90 Business and placeholder for future I-49 corridor

Proposed interstates

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-69 100 160 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

References

  1. ^ a b c d "FHWA Route Log and Finder List". Federal Highway Administration. January 27, 2016. Retrieved June 28, 2016.
  2. ^ "State Highway Work Sets All-Time Mark". The Times-Picayune. New Orleans. January 29, 1967. p. 8-11.

External links

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