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U.S. Highway 90 (US 90), one of the major east–west U.S. Highways in the Southern United States, runs through southern Louisiana for 297.6 miles (478.9 km), serving Lake Charles, Lafayette, New Iberia, Morgan City, and New Orleans. Much of it west of Lafayette and east of New Orleans has been supplanted by Interstate 10 (I-10) for all but local traffic, but the section between Lafayette and New Orleans runs a good deal south of I-10.
 U.S. Highway 90 | ||||
|---|---|---|---|---|
 US 90 highlighted in red | ||||
| Route information | ||||
| Maintained by Louisiana DOTD | ||||
| Length | 297.6 mi.[1] (478.9 km) | |||
| Existed | 1926–present | |||
| Major junctions | ||||
| West end |   I-10 / US 90 at Texas state line east of Orange, TX | |||
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| East end | US 90 at Mississippi state line west of Pearlington, MS | |||
| Location | ||||
| Country | United States | |||
| State | Louisiana | |||
| Parishes | Calcasieu, Jefferson Davis, Acadia, Lafayette, St. Martin, Iberia, St. Mary, Assumption, Terrebonne, Lafourche, St. Charles, Jefferson, Orleans, St. Tammany | |||
| Highway system | ||||
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The stretch between Lafayette and New Orleans is planned as a southern extension of I-49 and is signed as "future corridor I-49". This part of the highway is important to the offshore petroleum industry, as it connects the cities of Lafayette and New Orleans to the port cities along the coast. Most of US 90 from New Iberia to New Orleans that has not already been improved to Interstate grade, is mainly an expressway, excepting the towns traversed through, that can be easily upgraded to freeway standards. The freeway east of Morgan City, bypassing Houma to the north, was originally built as Louisiana Highway 3052 (LS 3052); US 90 was shifted to it from its former alignment (now LA 182) once it was completed.
US 90 replaced almost all of the Louisiana section of the San Diego–St. Augustine running Old Spanish Trail. It was also designated Louisiana Highway 2 (LA 2) until the 1955 renumbering. A long section of the old road, from Lafayette to northeast of Raceland, is now LA 182.
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State line to Lafayette
US 90 enters Louisiana at the Texas line over the Sabine River as part of I-10. Separating at exit 4 and running parallel on the north side of I-10 through Sulphur, before rejoining I-10 east of Westlake, crossing the Calcasieu River, and again splitting from I-10 at exit 31B (running on the south side of I-10) going through Lake Charles as Fruge, West 4th, then East 4th, before leaving town. In Iowa US 90 intersects with the southern terminus of US 165 continuing east through Lacassine, Welsh, Roanoke, Jennings, and Mermentau. East of Mermentau US 90 runs north of and parallel to a section of the Old Spanish Trail through Midland, Estherwood, and Crowley. In Crowley US 90 makes a north then east jog, bringing it close and parallel to I-10, passing through Rayne, Duson, Scott, and then into Lafayette.
Lafayette to Raceland
From Lafayette, US 90 traverses a south-southeast course to Patterson, where the highway takes a more easterly direction to New Orleans. The section east (south) of Broussard, beginning east of Captain Cade road[2] but west of LA 88, to just west of Patterson, has been improved to Interstate grade and completed in June 2011. These improvements include the completion of the overpasses at Coteau Road (LA 88), Jefferson Island Road (LA 675), Center street (LA 14), Avery Island road (LA 329), South Lewis Street (Parish Road 605), Weeks Island road (LA 83), Darnall Road (Parish Road 211), Patout Road (LA 85), and Canal Street (LA 668). This section ties into the already completed section that begins at LA 318 and terminates at East Main street (LA 182) just east of Calumet. West of Berwick US 90 is listed as Interstate grade with a 70-mile (110 km) per hour speed limit from (mile marker 174) to east of Raceland and an intersection with LA 1 (mile marker 215B), before reverting to a standard divided highway and continuing on a north/northeast direction to New Orleans.
New Orleans
US 90 enters Jefferson Parish, and after passing Avondale, heads north at an intersection with US 90 Business, called the Westbank Expressway, through Bridge City, and across the Mississippi River over the Huey P. Long Bridge. Crossing the river US 90, designated as S. Clearview Parkway, intersects with and runs east as the Jefferson Highway,[3] that was originally part of the "Interstate Trail" and the "Pine to Palm" highway, a 2,300-mile (3,700 km) north–south transcontinental U.S interstate highway running from New Orleans to Winnipeg, Manitoba, Canada[4] The highway terminus was at the corner of St. Charles Avenue and Common Street with a monument that was erected in 1916. The original highway was changed to follow US 90 and LA 48. After 1935 Jefferson became S. Claiborne Avenue at the Orleans Parish line and makes a sweeping south-to-north semicircle weaving through New Orleans. As the highway swings north it intersects and runs under an elevated I-10, where it turns northwest along Tulane Avenue. The highway soon turns northeast along South Broad Avenue—North Broad Avenue after the intersection with Canal Street—then runs into a pair of regular individual streets (i.e., not a street that has a median—or neutral ground in the vernacular of New Orleans—separating half of the lanes from the other half) that are from the old street grid and thus parallel at about 120 yards (110 m) from each other (named New Orleans Street & Allen Street) for about 1⁄4 mile (0.40 km), crossing I-610 in this tiny span, and finally turning right (east) onto Gentilly Boulevard (which has a median), which eventually becomes Chef Menteur Highway (a mainly straight highway that replaced what is now called Old Gentilly Road), then crossing I-510, and then a few miles later, loses the median and meanders (i.e., in a manner similar to the way that Old Gentily meanders) until first reaching the national southern terminus of U.S. 11, which leads to the Irish Bayou community, and then passing the Venetian Isles community (a subdivision in which homes have a canal in the backyard for easy access to the surrounding lakes), and finally becoming a two-lane highway at the bridge over the Chef Menteur Pass to go past the Lake Catherine community until reaching the bridge over the Rigolets, after which US 90 finally leaves the corporate limit of New Orleans, entering St. Tammany Parish.[5] The stretch in the Lake Catherine community is where Jayne Mansfield was killed in a car accident on her way to New Orleans from Mississippi.
In St. Tammany Parish, US 90 then enters Slidell. After exiting Slidell it heads east and crosses the Mississippi state line at a drawbridge at the Pearl River.
- The Jefferson Highway was the first north/south transcontinental highway in America, the second interstate highway, after the Lincoln Highway that it intersects in Colo, Iowa, but was the first international interstate highway in the world.[6]
Interstates 49 and 910
The Business US 90 portion of the Pontchartrain Expressway is also designated as Interstate 910,[7] however it is not signed as such. This is a temporary designation that overlaps all freeway portions of Business US 90 (the Pontchartrain Expressway, Crescent City Connection, and Westbank Expressway). When Interstate 49 is completed from Lafayette to New Orleans, Business US 90/Interstate 910 will be resigned as Interstate 49.
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The modern US 90 has its roots in an early 20th-century auto trail known as the Old Spanish Trail, which was designated as State Route 2 within Louisiana when the state first numbered its highway system in 1921. US 90 was applied to the route when the numbered U.S. Highway system was implemented in 1926. With minor exceptions, Route 2 generally remained co-signed with US 90 throughout the state until such overlapping between U.S. and state routes was eliminated in the 1955 Louisiana Highway renumbering. Prior to 1955, as US 90 was gradually relocated onto newer and improved alignments, Route 2 was often moved accordingly. Former alignments remaining in the state highway system were then designated as part of State Route 1092, with shorter pieces designated as Route 2-D, 2-E, and so on as needed.
- In Calcasieu Parish, on the border with Orange, Texas, US 90 originally crossed the Sabine River eastward into East Orange, Louisiana, a town consisting primarily of gambling, showboats, and supper clubs. The bridge over the Sabine River was removed after US 90 had been rerouted northward in Orange onto Simmons Drive and Interstate 10.[8]
- In Lake Charles, US 90 traveled from Westlake down present-day Mike Hooks Road to cross the Calcasieu River on a bridge built in 1916. The road then traveled along Shell Beach and Lakeshore Drive to continue eastward on Broad Street. This alignment changed with the completion of the Lake Charles I-10 Bridge in 1952.
- In St. Charles Parish and Lafourche Parish, US 90 traveled down present-day LA 631, crossing the swing bridge still used by local traffic in Des Allemands.
- In Lafourche Parish, the old US 90 (now LA 182) splits off from the current US 90/Future I-49 just northeast of Raceland. Further southwest it enters Raceland, intersecting with LA 308, then immediately afterwards crosses Bayou Lafourche over a lift bridge. The route then goes to the right, through the middle of Raceland coaligned with LA 1 for a few thousand feet. It then takes a turn to the southwest as Willow Street or Old Houma Road, interchanging with US 90/Future I-49. Just south of this interchange, it travels as a four-lane highway until the junction with Prospect Boulevard/LA 3087. Old Highway 90/LA 182 then heads to Bayou Blue and on to downtown Houma as a major two-lane highway. LA 653 was US 90's original route but was supplanted in the 1950s by its current route, what is now LA 182, and most of this original road has been abandoned.
- Jefferson Parish:
- 1926–1928: The original alignment of US 90 generally followed today's LA 18 through Jefferson Parish and crossed the Mississippi River into Orleans Parish (city of New Orleans) via the Jackson Avenue Ferry at Gretna. The exact routing was as follows:
- LA 18 (River Road) from the St. Charles Parish line eastbound to Avondale.
- The original road through the Avondale shipyards continued straight along the river levee and no longer exists.
- LA 541 (continuation of River Road) and Bridge City Avenue through Bridge City.
- LA 18 (Seven Oaks Boulevard, formerly Bridge City Avenue) to Westwego.
- LA 541 (River Road), Sala Avenue, and LA 18 (Fourth Street) through Westwego.
- LA 18 (Fourth Street, Barataria Boulevard, and continuation of Fourth Street) to Gretna.
- Huey P. Long Avenue to the Gretna Ferry landing.
- 1928–1930: US 90 was re-routed over the Walnut Street Ferry in September 1928, shortening the route in Jefferson Parish to the former ferry landing at River Road and Sala Avenue in Westwego.
- 1930–1937: US 90 was restored to its original route through Jefferson Parish in May 1930, after widening and resurfacing of the Westwego-Gretna section was completed in April.
- 1937–1941: The Huey P. Long Bridge was opened in December 1935. US 90 was re-routed over the bridge, following Jefferson Highway into Orleans Parish, after widening of that thoroughfare to four lanes was completed in 1937. (LA 2 remained on the old alignment until the 1955 renumbering of Louisiana highways.)
- 1941–present: The current alignment (the "Boutte Cutoff") west of the Huey P. Long Bridge was opened in April 1941, bypassing the winding river road. This alignment was widened to four lanes in 1953.
- 1926–1928: The original alignment of US 90 generally followed today's LA 18 through Jefferson Parish and crossed the Mississippi River into Orleans Parish (city of New Orleans) via the Jackson Avenue Ferry at Gretna. The exact routing was as follows:
- Orleans Parish (west of Peoples Avenue):
- 1926–1928: US 90 originally followed this route through New Orleans, starting from the Jackson Avenue Ferry landing:
- Jackson Avenue and South Claiborne Avenue to downtown New Orleans.
- Canal Street, North Broad Avenue, Bruxelles Street, and Gentilly Boulevard to Peoples Avenue.
- The above route, though signed in the field, had several problems that were mostly alleviated by a re-routing in 1928:
- The New Basin Canal bridge on South Claiborne Avenue had been closed in 1923 due to safety concerns. A temporary bridge was opened in July 1928, but it was a traffic bottleneck.
- Bruxelles Street became a one-way street in 1926, forcing westbound traffic to follow the unpaved Paris and St. Bernard Avenues from Gentilly to Broad.
- Jackson Avenue was also unpaved beyond St. Charles Avenue and did not connect directly to South Claiborne Avenue westbound.
- The Jackson Avenue Ferry service was considered to be inferior to that of the Walnut Street Ferry which the Old Spanish Trail had followed for years.
- 1928–1930: The route of US 90 was revised above Canal Street in September 1928, utilizing a better ferry and avoiding the New Basin Canal bridge and railroad crossings on South Claiborne Avenue. From the Walnut Street Ferry landing, the revised route was as follows:
- Walnut Street, St. Charles Avenue to Lee Circle, Howard Avenue, and Camp Street to Canal Street.
- Because of one-way streets, westbound traffic followed Canal Street, St. Charles Avenue, and Audubon Street to the Walnut Street Ferry landing.
- 1930–1931: In spite of protests, US 90 was routed back over the Jackson Avenue Ferry in May 1930, following Jackson Avenue, St. Charles Avenue, Washington Avenue, and South Claiborne Avenue to Canal Street.
- 1931–1937: After Jackson Avenue was paved between St. Charles Avenue and South Claiborne Avenue in October 1931, the Washington Avenue detour was eliminated. Paving of Paris and St. Bernard Avenues was completed in March 1932, but eastbound traffic still followed Bruxelles Street.
- 1937–1939: After being re-routed over the Huey P. Long Bridge, US 90 now entered Orleans Parish on South Claiborne Avenue, following South Carrollton Avenue and Canal Street to North Broad Avenue.
- 1939–1946: US 90 shortly began to follow South Claiborne Avenue directly to Canal Street.
- 1946–1956: The Bruxelles Street link was finally eliminated. Eastbound traffic now followed St. Bernard and Paris Avenues from Broad to Gentilly. Westbound traffic followed St. Bernard Avenue only.
- 1956–1975: US 90 was re-routed over the North Broad Avenue extension and railroad underpass that had been opened in April 1952. Eastbound traffic was fed onto Allen Street to Gentilly Boulevard. Westbound traffic followed New Orleans Street from Gentilly Boulevard onto North Broad Avenue.
- 1975–present: The final change in routing was the substitution of Tulane Avenue for Canal Street around 1975.
- 1926–1928: US 90 originally followed this route through New Orleans, starting from the Jackson Avenue Ferry landing:
- Orleans Parish (east of Peoples Avenue):
- 1926–1929: Continuing from the intersection of Gentilly Boulevard and Peoples Avenue, the original route of US 90 through eastern New Orleans was as follows:
- Old Gentilly Road to the Industrial Canal. US 90 crossed the canal over the L&N Railroad bridge (also known as the Almonaster Avenue Bridge), a combination railroad/vehicular bridge opened in 1919 now closed to vehicular traffic. The bridge was originally connected to Old Gentilly Road via two sharp right-angle turns on either side.
- Continuation of Old Gentilly Road to Michoud.
- US 90 remains on its original alignment (Chef Menteur Highway) from Michoud to a point two miles west of the Chef Menteur Bridge, where the original road continued to the left along Bayou Sauvage. Portions of this road still exist as Old Chef Menteur Road and Fort Macomb Road.
- US 90 crossed the Chef Menteur Pass by ferry, then continued along the current alignment toward the Rigolets. About a third of the way to the Rigolets, a curve on the south side of the road has been bypassed.
- At the approach to the Rigolets Bridge, US 90 continued straight ahead on a road which no longer exists to the site of the Rigolets Ferry to St. Tammany Parish.
- 1929–1930: The Chef Menteur Bridge was opened in September 1929, replacing the ferry service.
- 1930–1932: The Rigolets Bridge (with new approach road) was opened in June 1930, followed shortly by the first section of Chef Menteur Highway between Downman Road and Lee Station. The route was now:
- Old Gentilly Road to the Industrial Canal, with the dangerous bridge approaches smoothed out. The eastern approach now fed traffic onto the new Chef Menteur Highway.
- Current US 90 (Chef Menteur Highway) to Lee Station, curving back onto Old Gentilly Road just east of present-day Crowder Boulevard.
- Old Gentilly Road to Michoud.
- Current US 90 (Chef Menteur Highway) and old approach (described above) to Chef Menteur Pass.
- Current US 90 (Chef Menteur Highway) across Chef Menteur and Rigolets bridges to St. Tammany Parish.
- 1932–1934: The Peoples Avenue-Downman Road section of Chef Menteur Highway, including a new bridge over the Industrial Canal, was opened in 1932. The original Danziger Bridge existed on the north side of the current bridge.
- 1934–1942: The permanent approach road to the Chef Menteur Bridge was finally opened, eliminating the road along Bayou Sauvage with right-angle turn onto the bridge.
- 1942–present: The "Michoud Cutoff," the section of Chef Menteur Highway from Lee Station to Michoud, was opened in May 1942, completing the current alignment.
- 1926–1929: Continuing from the intersection of Gentilly Boulevard and Peoples Avenue, the original route of US 90 through eastern New Orleans was as follows:
- In St. Tammany Parish, US 90 originally took a much longer route toward Mississippi. After crossing the Rigolets, US 90 traveled along LA 433 (Old Spanish Trail) to Slidell, then US 11 (Front Street) to Pearl River, continuing onto LA 3081 (Main Street). The bridge across the West Pearl River no longer exists. The route continued onto Old US 11, crossing the site of current US 11/I-59. Old US 11 continues through the Pearl River State Wildlife Management Area to the Mississippi state line, where a bridge once crossed the Pearl River. This out-of-the-way alignment was bypassed around 1930 when the current alignment to Pearlington was constructed. US 11 was subsequently routed onto it.
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In Louisiana, current plans call for parts of US 90 to be upgraded to Interstate Highway standards from Lafayette to just west of New Orleans and designated I-49. The stretch of US 90 to be upgraded to I-49 is listed under High Priority Corridor 37 and stretches from the West Bank Expressway (US 90 Business near Westwego) to just north of downtown Lafayette, where US 90 splits from US 167 (the two highways converge in downtown Lafayette).[9] The stretch of US 167 from US 90 to I-10 will also be upgraded and included as part of I-49. As of March 2008, due to a $1 billion surplus in the Louisiana state budget, the legislature approved a bill which proposed capacity improvements on US 90 in the Lafayette area. US 167/US 90 is currently six-lanes from I-10 in Lafayette to LA 182 and LA 96 in Broussard.[citation needed]
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| Parish | Location | mi[1][10] | km | Exit | Destinations | Notes |
|---|---|---|---|---|---|---|
| Sabine River | 0.000– 0.059 | 0.000– 0.095 |   I-10 west / US 90 west – Beaumont | Continuation in Texas | ||
| Bridge over Sabine River | ||||||
| Calcasieu | | 0.144 | 0.232 | 1 | Sabine River Turnaround | Eastbound entrance and westbound exit |
| Toomey | 3.448– 5.116 | 5.549– 8.233 | 4 |  I-10 east – Lake Charles | Eastern end of I-10 concurrency | |
| 5.237 | 8.428 |   LA 109 north – Starks LA 3112 west | Southern terminus of LA 109; eastern terminus of LA 3112 | |||
| Vinton | 8.4 | 13.5 |   LA 3063 (West Street) to I-10 | |||
| Sulphur | 22.8 | 36.7 |  LA 27 (Beglis Parkway) – DeQuincy, Cameron | |||
| 24.9 | 40.1 |   LA 108 south (North Cities Service Highway) to I-10 | Northeastern terminus of LA 108 | |||
| | 27.9 | 44.9 | 26 | I-10 west – Beaumont | Western end of I-10 concurrency; eastbound entrance and westbound exit | |
| Westlake | 28.5– 28.9 | 45.9– 46.5 | 27 |  LA 378 (Sampson Street) – Westlake | Southwestern terminus of LA 378 | |
| Westlake–Lake Charles line | 28.9– 30.1 | 46.5– 48.4 | Bridge over Calcasieu River | |||
| Lake Charles | 30.4 | 48.9 | 29 |  LA 1262 – Downtown Area | Eastbound exit and westbound entrance | |
| 31.0 | 49.9 | 30A | LA 1262 (Lakeshore Drive) | Northern terminus of LA 1262; eastbound entrance and westbound exit | ||
| 31.3– 31.6 | 50.4– 50.9 | 30B | Ryan Street – Downtown Area | Eastbound entrance and westbound exit | ||
| 31.9– 32.4 | 51.3– 52.1 | 31A |   US 90 Bus. east (Enterprise Boulevard) | Western terminus of US 90 Bus. | ||
| 32.6– 32.8 | 52.5– 52.8 | 31B | I-10 east – Lafayette | Eastern end of I-10 concurrency | ||
| 33.6 | 54.1 |   US 171 north / LA 14 south (Martin Luther King Highway) – Cameron, DeRidder | Southern terminus of US 171; western terminus of LA 14 | |||
| 34.4 | 55.4 | US 90 Bus. west (Pamco Road) | Eastern terminus of US 90 Bus. | |||
| 34.5 | 55.5 |  I-210 east – Lafayette | Exit 11 on I-210; eastbound entrance and exit (westbound via US 90 Bus.) | |||
| | 36.7 | 59.1 |  LA 397 (East Ward Line Road) to I-10 – Creole, Cameron | |||
| | 37.6 | 60.5 |  LA 3256 (Manchester Road) – Chloe | Western terminus of LA 3256 | ||
| Iowa | 43.5 | 70.0 |  LA 383 north (South Thompson Avenue) | Southern terminus of LA 383 | ||
| 44.4 | 71.5 |  US 165 north to I-10 – Kinder, Alexandria | Southern terminus of US 165 | |||
| Jefferson Davis | Lacassine | 48.6 | 78.2 |  LA 101 – Hayes | ||
| | 51.7 | 83.2 |  LA 1131 | Northern terminus of LA 1131 | ||
| Welsh | 55.0 | 88.5 |  LA 99 north (South Adams Street) – Pine Island | Western end of LA 99 concurrency | ||
| 55.3 | 89.0 | LA 99 south (South Simmons Street) – Thornwell, Lake Arthur | Eastern end of LA 99 concurrency | |||
| | 57.8 | 93.0 |  LA 382 – Thornwell | Northern terminus of LA 382 | ||
| Roanoke | 59.5 | 95.8 |  LA 395 north – Elton | Southern terminus of LA 395 | ||
| Jennings | 64.5 | 103.8 |  LA 26 north (Elton Road) to I-10 – Elton LA 26 south (North Lake Arthur Avenue) – Lake Arthur | |||
| 65.0 | 104.6 |   LA 97 / LA 102 north (North Cutting Avenue) to I-10 – Evangeline, Lafayette | Western end of LA 102 concurrency; southern terminus of LA 97 | |||
| 65.9 | 106.1 | LA 102 south (South Cutting Avenue) LA 3055 west (East Railroad Avenue) – Lake Arthur | Eastern end of LA 102 concurrency; eastern terminus of LA 3055 | |||
| | 68.6 | 110.4 |  LA 1126 | Eastern terminus of LA 1126 | ||
| Jefferson Davis–Acadia parish line | Mermentau | 70.4 | 113.3 | Bridge over Mermentau River | ||
| Acadia | | 71.7 | 115.4 |  LA 92 south (Mermentau Cove Road) | Northwestern terminus of LA 92 | |
| Midland | 75.8 | 122.0 |  LA 91 south (South Crocker Street) – Morse, Gueydan | Western end of LA 91 concurrency | ||
| Estherwood | 77.9 | 125.4 | LA 91 north (North Canal Street) – Iota | Eastern end of LA 91 concurrency | ||
| 78.1 | 125.7 |  LA 1124 south (South Leblanc Road) – Morse, Kaplan | ||||
| Crowley | 84.1 | 135.3 |  LA 13 north (North Parkerson Avenue) – Eunice | Western end of LA 13 concurrency | ||
| 84.6 | 136.2 | LA 13 south (North Eastern Avenue) – Kaplan  LA 13 Truck begins | Eastern end of LA 13 concurrency; western end of LA 13 Truck concurrency; southern terminus of LA 13 Truck | |||
| 85.8 | 138.1 |   LA 13 Truck / LA 1111 Spur north (Tower Road) to I-10 – Eunice | Eastern end of LA 13 Truck concurrency; southwestern terminus of LA 1111 Spur | |||
| 86.0 | 138.4 | LA 1111 Spur (Odd Fellows Road) to I-10 – Eunice | Northeastern terminus of LA 1111 Spur | |||
| Rayne | 91.4 | 147.1 |  LA 35 south (Abbeville Highway) – Kaplan, Abbeville | Western end of LA 35 concurrency | ||
| 92.0 | 148.1 | LA 35 north (North Adams Avenue) to I-10 – Opelousas | Eastern end of LA 35 concurrency | |||
| Acadia–Lafayette parish line | Duson | 95.5 | 153.7 |  LA 719 (South Riceland Road) | Northern terminus of LA 719 | |
| Lafayette | 96.5 | 155.3 |  LA 95 north (Austria Road) to I-10 – Church Point | Southern terminus of LA 95 | ||
| 97.5 | 156.9 |  LA 343 (South Richfield Road) – Ridge, Maurice | ||||
| Sadou | 99.5 | 160.1 |  LA 724 (South Fieldspan Road) – Judice | |||
| Scott | 101.7 | 163.7 |  LA 93 north (Apollo Road) – Cankton, Sunset | Southern terminus of LA 93 | ||
| Lafayette | 104.4 | 168.0 |  LA 3184 (Ambassador Caffery Parkway) to I-10 | |||
| 105.0 | 169.0 |  LA 3025 (North Bertrand Drive) | Northern terminus of LA 3025 | |||
| 106.2 | 170.9 |   US 90 Bus. east / LA 182 (North University Avenue) to I-10 / I-49 – Opelousas | Western terminus of US 90 Bus. | |||
| 107.4 | 172.8 |  US 167 north (NW/NE Evangeline Thruway) to I-10 / I-49 – Opelousas | Western end of US 167 concurrency; future western end of I-49 concurrency | |||
| 107.7 | 173.3 |  LA 176 north (Jefferson Boulevard) | Southern terminus of LA 176 | |||
| 108.0 | 173.8 | US 167 south (Johnston Street) – Abbeville LA 94 east (Louisiana Avenue) – Breaux Bridge | Eastern end of US 167 concurrency; western terminus of LA 94 | |||
| 108.6 | 174.8 | US 90 Bus. west (East Pinhook Road) | Eastern terminus of US 90 Bus. | |||
| 109.4 | 176.1 |  LA 729 (General Mouton Avenue) | Southeastern terminus of LA 729 | |||
| 110.1 | 177.2 |  LA 728-2 | Southern terminus of LA 728-2 | |||
| Lafayette–Broussard line | 112.2 | 180.6 |  LA 89-1 south / LA 182 west (Southpark Road) – Youngsville | Northern terminus of LA 89-1; western end of LA 182 concurrency | ||
| Broussard | 113.1 | 182.0 | Future Western end of freeway | |||
| 115.621 | 186.074 | 115A | St. Nazaire Road / Albertson Parkway | Eastbound exit, westbound entrance | ||
| 115.951– 116.407 | 186.605– 187.339 | 115B |   LA 182 east (East Main Street) to LA 96 – Cade, St. Martinville | Eastern end of LA 182 concurrency; signed as Exit 115A westbound | ||
| 116.9 | 188.1 | 117 |  LA 3073 (Ambassador Caffery Parkway, Corne Road) | Signed eastbound; at-grade intersection; future interchange under construction and planned to be completed and opened in 2026 | ||
| 118.0 | 189.9 | 119 |  LA 92-1 west (Young Street) – Youngsville | Western end of LA 92-1 concurrency | ||
| St. Martin | 118.5 | 190.7 | 119 | LA 92-1 east (Smede Highway) – Cade, St. Martinville | Eastern end of LA 92-1 concurrency | |
| Iberia | | 120.6 | 194.1 | Current Western end of freeway | ||
| | 121.4– 121.9 | 195.4– 196.2 | 122 |  LA 88 | To Acadiana Regional Airport | |
| | 125.9– 126.4 | 202.6– 203.4 | 126 |  LA 675 (Jefferson Island Road) | Western terminus of LA 675 | |
| New Iberia | 127.8– 128.3 | 205.7– 206.5 | 128A | LA 14 (Center Street) – Avery Island, Abbeville | To Palmetto Island State Park and Lake Fausse Pointe State Park | |
| 129.0 | 207.6 | 128B |  LA 329 (Avery Island Road) – New Iberia, Avery Island | Eastbound entrance and westbound exit | ||
| | 129.6– 130.2 | 208.6– 209.5 | 129 |  PR 605 (South Lewis Street) – Port of Iberia | ||
| | 130.6– 131.2 | 210.2– 211.1 | 130 |  LA 83 (Weeks Island Road) | ||
| | 133.9– 134.4 | 215.5– 216.3 | 134 |  PR 211 (Darnall Road) | To Cypremort Point State Park and Lake Fausse Pointe State Park | |
| | 136.9– 137.5 | 220.3– 221.3 | 137 |  LA 85 – Jeanerette, Patoutville | ||
| | 140.3– 140.8 | 225.8– 226.6 | 141 |  LA 668 (Canal Street) – Jeanerette | ||
| St. Mary | | 144.0 | 231.7 | 144 |  LA 318 – Sorrel, Weeks Island | |
| Baldwin | 148.2– 148.5 | 238.5– 239.0 | 148 | LA 83 – Baldwin, Louisa | ||
| Franklin | 151.7– 152.3 | 244.1– 245.1 | 152 |  LA 3211 north – Franklin | Southern terminus of LA 3211 | |
| | 157.5– 157.8 | 253.5– 254.0 | 158 |  LA 3215 north – Garden City, Franklin | Southern terminus of LA 3215 | |
| Bayou Sale | 159.0– 159.6 | 255.9– 256.9 | 159 |  LA 317 – Centerville, Burns Point | ||
| Ricohoc | 163.4 | 263.0 | Eastern end of freeway | |||
| 163 | LA 182 west (East Main Street) | Western end of LA 182 concurrency; future interchange | ||||
| | 164.1– 164.3 | 264.1– 264.4 | Bridge over Wax Lake Outlet | |||
| Calumet | 164.8 | 265.2 | 164 | LA 182 east | Eastern end of LA 182 concurrency | |
| Berwick | 173.676 | 279.504 | Western end of freeway | |||
| 173.756– 174.433 | 279.633– 280.723 | 173 | LA 182 – Berwick | Signed as exit 174 westbound | ||
| Berwick–Morgan City line | 174.609– 174.957 | 281.006– 281.566 | Bridge over Lower Atchafalaya River / Berwick Bay | |||
| Morgan City | 175.136 | 281.854 | 175A | Federal Avenue | Eastbound exit and westbound entrance | |
| 175.446– 176.028 | 282.353– 283.290 | 175B | US 90 Bus. / LA 182 east LA 70 (9th Street) LA 182 west (Brashear Avenue) – Morgan City | Western terminus of US 90 Bus. and LA 70; signed as exit 175 westbound | ||
| 176.1– 176.6 | 283.4– 284.2 | 176 | Dr. Martin Luther King, Jr. Boulevard | |||
| Amelia | 181.1– 181.7 | 291.5– 292.4 | 181 |  PR 4 (Lake Palourde Bypass Road) – Amelia | ||
| St. Mary–Assumption parish line | | 181.4– 182.7 | 291.9– 294.0 | Bridge over Bayou Boeuf | ||
| Assumption | | 182.4– 182.9 | 293.5– 294.3 | 182 |  LA 662 – Boeuf US 90 Bus. west | Eastern terminus of US 90 Bus. |
| Terrebonne | | 185.1– 185.8 | 297.9– 299.0 | 185 | LA 662 to LA 182 | |
| Gibson | 189.4– 190.4 | 304.8– 306.4 | 189 |  LA 20 – Gibson | ||
| Chacahoula | 194.6– 195.0 | 313.2– 313.8 | 194 | LA 20 – Chacahoula, Thibodaux | ||
| | 200.2– 200.4 | 322.2– 322.5 | 200 |  LA 311 | ||
| | 201.8– 202.5 | 324.8– 325.9 | 202 |  LA 24 – Thibodaux, Houma | ||
| Terrebonne–Lafourche parish line | | 203.8– 204.6 | 328.0– 329.3 | 204 |  LA 316 (Bayou Blue Road) – Gray, Bayou Blue | |
| Lafourche | | 210.9– 211.2 | 339.4– 339.9 | 210 | LA 182 – Raceland, Houma | |
| Raceland | 215.509– 215.865 | 346.828– 347.401 | 215A |  LA 1 – Raceland, Lockport | Signed as exit 215 eastbound | |
| 216.285 | 348.077 | 215B |  LA 308 – Raceland | Eastbound entrance and westbound exit | ||
| 218.373 | 351.437 | Eastern end of freeway | ||||
| | 219.2– 219.4 | 352.8– 353.1 | LA 182 – Raceland | Southeastern terminus of LA 182 | ||
| | 225.3 | 362.6 |  LA 631 | Western terminus of LA 631 | ||
| Lafourche–St. Charles parish line | Des Allemands | 225.4– 225.9 | 362.7– 363.6 | Bridge over Bayou Des Allemands | ||
| St. Charles | 226.4 | 364.4 |  LA 632 (Levee Road, WPA Road) | |||
| 226.5– 226.7 | 364.5– 364.8 | LA 631 Spur (Old US 90) – Des Allemands Business District | Eastern terminus of LA 631 Spur (signed as LA 631) | |||
| | 228.8 | 368.2 |  LA 635 | Eastern terminus of LA 635 | ||
| Paradis | 230.3 | 370.6 |  LA 306 – Bayou Gauche | |||
| Boutte | 232.8– 233.7 | 374.7– 376.1 |    I-310 north / LA 3127 – Donaldsonville, New Orleans | Southern terminus of I-310 and LA 3127 | ||
| 234.0 | 376.6 |  LA 52 (Paul Maillard Road) – Luling LA 633 (Magnolia Ridge Road) | Southern terminus of LA 52; northern terminus of LA 633 | |||
| Luling | 236.7 | 380.9 |  LA 3060 (Barton Avenue) | Southern terminus of LA 3060 | ||
| Jefferson | | 246.6– 246.9 | 396.9– 397.3 | US 90 Bus. east (West Bank Expressway) – Gretna | Interchange; western terminus of US 90 Bus.; future eastern end of I-49 concurrency | |
| | 247.5 | 398.3 |  LA 18 west (River Road) – Avondale | Western end of LA 18 concurrency | ||
| Bridge City | 248.3 | 399.6 | LA 18 east (Seven Oaks Boulevard) – Bridge City, Westwego | Interchange; eastern end of LA 18 concurrency | ||
| | 248.4– 250.3 | 399.8– 402.8 | Huey P. Long Bridge over Mississippi River | |||
| Elmwood | 250.3 | 402.8 |  LA 48 west (Jefferson Highway) LA 3152 north (South Clearview Parkway) | Interchange; eastern terminus of LA 48; southern terminus of LA 3152 | ||
| Jefferson | 251.6 | 404.9 |  LA 611-3 (Shrewsbury Road) | Northern terminus of LA 611-3 | ||
| 251.9 | 405.4 |  LA 3046 north (Causeway Boulevard) | Partial interchange; southern terminus of LA 3046 | |||
| 252.4 | 406.2 |  To LA 3139 south (Earhart Expressway) via Deckbar Avenue | ||||
| Orleans | New Orleans | 257.2– 257.9 | 413.9– 415.0 | I-10 – Slidell, Baton Rouge | Exit 234A, C on I-10; indirect access from westbound I-10 to eastbound US 90 | |
| US 90 Bus. west – Mississippi River Bridge | Exit 13A–B on US 90 Bus.; indirect access from eastbound US 90 | |||||
| Poydras Street – Superdome | Eastbound exit and westbound entrance | |||||
| 258.8 | 416.5 |  US 61 north (Tulane Avenue) | Southern terminus of US 61 | |||
| 261.3 | 420.5 |  I-610 east – Slidell | Exit 2B on I-610; eastbound entrance and westbound exit | |||
| 262.0 | 421.6 |  LA 3021 south (Elysian Fields Avenue) | Northern terminus of LA 3021 | |||
| 263.7– 264.1 | 424.4– 425.0 | France Road | Interchange | |||
| 263.8– 264.5 | 424.5– 425.7 | Danziger Bridge over Industrial Canal | ||||
| 264.5 | 425.7 | To I-10 west – Baton Rouge via Downman Road | Eastbound exit and westbound entrance | |||
| 264.9– 265.1 | 426.3– 426.6 | I-10 – Baton Rouge, Slidell | Exit 240B on I-10 | |||
| 269.3– 269.8 | 433.4– 434.2 |   I-510 / LA 47 (Paris Road) – Slidell, Chalmette | Exit 2 on I-510 | |||
| 275.5 | 443.4 |  US 11 north to I-10 – Irish Bayou | Southern terminus of US 11 | |||
| 279.2– 279.5 | 449.3– 449.8 | Bridge over Chef Menteur Pass | ||||
| Orleans–St. Tammany parish line | | 288.0– 289.0 | 463.5– 465.1 | Bridge over the Rigolets | ||
| St. Tammany | | 289.3 | 465.6 |  LA 433 north (Old Spanish Trail) to I-10 | Southern terminus of LA 433 | |
| | 293.7 | 472.7 |  US 190 west to I-10 – Slidell | Eastern terminus of US 190 | ||
| Pearl River | 294.2– 297.6 | 473.5– 478.9 | Five bridges over Pearl River system | |||
| US 90 east – Bay St. Louis | Continuation into Mississippi | |||||
1.000 mi = 1.609 km; 1.000 km = 0.621 mi
| ||||||
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- US 90 Bus. (90-X) runs mainly along the old alignment through downtown Lake Charles, while US 90 uses I-10 and the newer Fruge Street.
- US 90 Bus. (90-Y) is the old route through downtown Lafayette, mostly along LA 182.
- US 90 Bus. (90-W) is mostly the old route (LA 182) through and east of Morgan City.
- US 90 Bus. (90-Z) is more of a bypass than a business route in the New Orleans area, running along the Westbank Expressway.
- US 190 splits from US 90 east of Slidell, just west of the Mississippi state line. It heads west into Texas, staying north of US 90.
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