List of Interstate Highways in Louisiana
| Interstate Highways of the Louisiana Highway System | |
|---|---|
|
Highway markers in use for primary interstates (left) and auxiliary interstate (right) | |
| System information | |
| Length: | 933.84 mi[1] (1,502.87 km) |
| Formed: | June 29, 1956[2] |
| Highway names | |
| Interstates: | Interstate X (I-X) |
| System links | |
| |
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).
The system was authorized on June 29, 1956 when President Dwight D. Eisenhower signed into law the Federal Aid Highway Act of 1956.[2] The Louisiana Department of Highways, predecessor of the DOTD, began construction shortly afterward on its portion of the system, to which approximately 686 miles (1,104 km) was initially allotted.[3] The first road segment in the new system was officially opened and dedicated on February 24, 1960 and consisted of a portion of the Pontchartrain Expressway (I-10) in New Orleans.[4] Two months later, the first Interstate Highway shields installed in Louisiana accompanied the opening of a portion of I-20 near Ruston on April 23.[5]
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 | 1960 | 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 | 1967[6] | 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 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 | 1983 | 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 | 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
| 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
| 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
Louisiana portal
U.S. Roads portal
References
- 1 2 3 4 "FHWA Route Log and Finder List". Federal Highway Administration. January 27, 2016. Retrieved June 28, 2016.
- 1 2 "Highway Boom in La. Foreseen". The Times-Picayune. New Orleans. June 30, 1956. p. 1.
- ↑ "Hearing Scheduled Feb. 11 on Proposed US Highway". The Times-Picayune. New Orleans. January 22, 1958. p. 31.
- ↑ "Expressway Will Be Dedicated". The Times-Picayune. New Orleans. February 24, 1960. p. 13.
- ↑ Wagner, Robert (April 24, 1960). "Highway Unit is Dedicated". The Times-Picayune. New Orleans. p. 28.
- ↑ "State Highway Work Sets All-Time Mark". The Times-Picayune. New Orleans. January 29, 1967. p. 8-11.
External links
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