U.S. Route 51 in Louisiana

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U.S. Highway 51 marker

U.S. Highway 51
Route of US 51 highlighted in red
Route information
Maintained by Louisiana DOTD
Length: 69.13 mi[1] (111.25 km)
Existed: 1926 – present
Major junctions
South end: US 61 in LaPlace
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North end: US 51 at Mississippi state line north of Kentwood
Location
Parishes: St. John the Baptist, Tangipahoa
Highway system
  • Louisiana Highway System
LA 50 LA 52
SR 32 SR 33 SR 34

U.S. Highway 51 (US 51) in Louisiana runs 69.13 miles (111.25 km) in a north–south direction from the national southern terminus at US 61 in LaPlace to the Mississippi state line at Osyka.

After heading north through LaPlace to a junction with Interstate 10 (I-10) west of New Orleans, the highway joins I-55 on a 22-mile-long (35 km) twin-span viaduct across the Manchac Swamp. The bridge, which passes between Lakes Pontchartrain and Maurepas, is the second-longest bridge over water in the United States and serves as a vital hurricane evacuation route for the New Orleans metropolitan area.

With Ponchatoula served by the highway's only designated business route, US 51 splits from the interstate in the neighboring city of Hammond. For the remainder of its journey in southeastern Louisiana, the route closely parallels I-55, which carries the bulk of through traffic toward Jackson, Mississippi and points north. US 51 serves local traffic through a string of communities in Tangipahoa Parish situated along the Canadian National Railway line, including the towns of Independence, Amite City, and Kentwood.

Prior to 1951, US 51 began in downtown New Orleans and followed the route of US 61 to its current southern terminus in LaPlace. For a time in the late 1920s to mid-1930s, however, it was intended to follow a scenic route along the shore of Lake Pontchartrain known as the New Orleans–Hammond Lakeshore Highway. Construction difficulties and budget limitations led to the abandonment of the project before the portion through the swamps of St. Charles Parish could be completed.

Route description

LaPlace to Hammond

From the south, US 51 begins at an intersection with US 61 (West Airline Highway) in LaPlace, an unincorporated community located on the east bank of the Mississippi River in St. John the Baptist Parish. US 61 parallels the route of I-10 between New Orleans and Baton Rouge. US 51 heads northeast as an undivided four-lane highway with a center turning lane through a growing residential and commercial corridor. After 3 miles (4.8 km), the route reaches the edge of town and passes through a diamond interchange with I-10 at Exit 209. This interchange is also used to feed traffic between I-10 to the west and I-55 to the north as there is no direct connection. With a median replacing the center lane, US 51 proceeds a short distance to an intersection with Frenier Road, where signage directs through traffic to turn west and follow a ramp onto the elevated I-55 at Exit 1. For the next 22 miles (35 km), US 51 travels concurrently with the elevated four-lane interstate through the thickly wooded swamp lying between Lake Pontchartrain and Lake Maurepas. This twin-span concrete trestle is known as the Manchac Swamp Bridge and is the second-longest bridge over water in the United States. 7 miles (11 km) along the way, a tight diamond interchange at Ruddock connects with the grade-level pre-interstate alignment, which serves as a frontage road and closely parallels the entire stretch.[2][3][4]

After 13.5 miles (21.7 km), the highway elevates higher to cross Pass Manchac, a waterway that connects the two lakes and forms the boundary between St. John the Baptist Parish and Tangipahoa Parish. The area flanking the pass, generally called Manchac, contains a cluster of boat houses and fishing camps situated along the frontage road. This small community is also known as Galva on the south side and Akers on the north side. The highway proceeds through the swamps of southern Tangipahoa Parish for another 8 miles (13 km) before returning to grade. At this point, an exit primarily serving southbound traffic connects to the north end of the frontage road. Soon afterward, I-55/US 51 curves to the northwest at Exit 23 while US 51 Bus. begins and splits off straight ahead into the small city of Ponchatoula. The interstate proceeds around the west side of town, an area of scattered suburban development within the thick pine forest. A cloverleaf interchange at Exit 26 connects to LA 22, the primary east–west highway through Ponchatoula. US 51 departs from I-55 at the following exit and enters the neighboring city of Hammond, the largest city along its route.[2][4][5]

Hammond to Mississippi state line

Heading north on Morrison Boulevard, US 51 returns to its original capacity, an undivided four-lane highway with center turning lane. Almost immediately, the highway crosses over without intersecting I-12, a northern bypass of the New Orleans metropolitan area, just east of its interchange with I-55. For the remainder of its journey in Louisiana, US 51 parallels the route of I-55 at a distance generally between 1 and 2 miles (1.6 and 3.2 km) to the east. Passing to the west of the traditional downtown area, US 51 intersects US 190 (West Thomas Street), its main east–west commercial thoroughfare. This intersection also marks the northern terminus of US 51 Bus.. Upon exiting Hammond, an intersection with LA 3234 (West University Avenue) connects the route with nearby Southeastern Louisiana University. Shortly afterward, US 51 narrows to an undivided two-lane highway and will remain in that capacity for the rest of its journey.[2][4][5]

After passing through the community of Natalbany, US 51 enters the village of Tickfaw and begins to follow alongside the Canadian National Railway (CN) line. Both the highway and the rail line pass through a string of communities on the way to the Mississippi state line and intersect a series of rural east–west routes that often lead to nearby interchanges with I-55, the main route of through traffic in the area. In Tickfaw, this function is served by LA 442, which also has a brief concurrency with US 51 as the former makes a zigzag in the center of town. 4 miles (6.4 km) north of Tickfaw, US 51 passes through the town of Independence, where LA 40 connects to I-55 as well as points such as Loranger and Husser. Continuing due north for 6 miles (9.7 km), US 51 enters Amite City, the parish seat. Initially traveling along 1st Street, one block distant from the railroad line, US 51 zigzags east onto Chestnut Street then north onto Central Avenue. One block later, flanked by the rail line and a row of antique brick storefronts, an intersection with LA 16 (Oak Street) in the center of town leads to I-55 and the towns of Franklinton and Montpelier.[2][4][5][6]

Between two points known as Arcola and Fluker, located just north of the neighboring town of Roseland, US 51 has a 3-mile-long (4.8 km) concurrency with LA 10, another connection to Franklinton as well as Greensburg. US 51 proceeds through rural northern Tangipahoa Parish, passing through a village of the same name before entering Kentwood, the final town along its route. US 51 passes through Kentwood on 3rd Street and intersects LA 38, the main east–west thoroughfare, at Avenue G. The highway curves to the northeast on the way out of town and continues for another 4 miles (6.4 km) to the state line. During this stretch is the final junction with a state route, LA 1054, in an area known as Greenlaw. Immediately across the state line, US 51 continues into the Pike County, Mississippi town of Osyka en route to McComb.[2][4][6]

Route classification and data

The portions of US 51 not concurrent with I-55 are generally classified as an urban or rural major collector by the Louisiana Department of Transportation and Development (La. DOTD). However, the section running through Hammond serves as an urban principal arterial. Daily traffic volume in 2013 peaked at 24,500 vehicles in Hammond, decreasing steadily to around 3,000 heading north toward Kentwood. After increasing to 14,700 through Kentwood, the figures dwindled to a low of 2,300 vehicles per day near the Mississippi state line.[1] The posted speed limit is generally 55 mph (90 km/h) in rural areas, reduced to as low as 25 mph (40 km/h) through town. However, the multilane sections through LaPlace and Hammond carry a speed limit of 45 mph (70 km/h).[2]

The portion of US 51 utilizing the route of I-55 is classified as an urban interstate north of Exit 23 and as a rural interstate otherwise. Daily traffic volume in 2013 averaged about 18,200 vehicles near I-10 and steadily increased to a peak of 31,200 vehicles between the Ponchatoula and Hammond exits. The posted speed limit is 70 mph (115 km/h).[1][2]

History

US 51 was designated in November 1926 as one of the original routes of the numbered U.S. Highway system.[7] It was the main traffic route connecting New Orleans to Jackson, Mississippi and Memphis, Tennessee in the days before the existence of the Interstate Highway System. The southern terminus of US 51 was originally located in downtown New Orleans at a junction with US 61 and US 90. Much of the distance between New Orleans and Hammond was intended to follow the New Orleans–Hammond Lakeshore Highway, an ambitious project by the Louisiana Highway Commission to construct a road through the LaBranche and Manchac swamps around the rim of Lake Pontchartrain. This proposed scenic highway was never fully realized, and US 51 effectively followed the route of US 61 through the New Orleans area until being truncated to its present terminus in LaPlace in 1951, eliminating the concurrency.[8][9]

New Orleans–Hammond Highway

State Route 33
Location: New OrleansTangipahoa Parish
Length: 71.3 mi (114.7 km)
Existed: 1921–1955

The New Orleans–Hammond Lakeshore Highway had been planned for several years when, in 1921, it was designated as part of State Route 33, one of the original 98 routes in the pre-1955 state highway system.[10]

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Route No. 33. Beginning at South Carrollton Avenue and New Basin Canal New Orleans, both sides of the New Basin Canal as far as the Cemeteries, thence on the West side of the New Basin Canal to West End thence along the shore of Lake Pontchartrain, through La Branche, Ruddock, Stradder[sic], Ponchatoula, Hammond, Amite, Kentwood, to a point on the Mississippi State line.

— 1921 legislative route description[10]

In New Orleans, Route 33 was designated to follow an existing road alongside a shipping canal from South Carrollton Avenue to an area on Lake Pontchartrain known as West End. (Much of this road still survives as Pontchartrain Boulevard and partly travels alongside the Pontchartrain Expressway, a section of I-10 that follows the old canal right-of-way.) However, the entire route along the lakeshore and on to Ponchatoula existed only on paper. North of Ponchatoula, the remainder of the route would have the benefit of following existing roads through the higher terrain there. The construction of the lakeshore highway was intended to provide a direct land connection between New Orleans and Hammond while taking advantage of the scenic beauty of Lake Pontchartrain and the surrounding swampland. In addition, the man-made embankment required to carry the road would serve as a levee to prevent lake water from inundating the extensive residential development envisioned to line the highway.[11]

Construction

Construction began in May 1923 to extend the highway south from Ponchatoula through the Manchac swamp to Frenier near the present intersection of I-10 and I-55. At the time, the method of road construction through such terrain involved the long and arduous task of dredging a canal along the intended right-of-way and piling up the spoils on the side of the canal to form an embankment. After a repeated process of machine-rolling and allowing for sufficient settling of the roadbed, the embankment would be surfaced with shells dredged from the lake.[12] A wooden bridge with a steel draw span was constructed across Pass Manchac, and smaller bridges crossed the numerous other waterways along the route.[13] This link of the highway was officially opened on April 1, 1927 with a formal dedication following three weeks later.[14] While still under construction, Route 33 was chosen as the official route of US 51 after the U.S. Highway system was implemented in November 1926.[7][15]

The connection to New Orleans was made by following State Route 53—roughly the modern route of US 51 from Frenier to LaPlace—and US 61 (State Route 1, the Jefferson Highway) into New Orleans. This was intended to be a temporary measure until the remainder of the route along Lake Pontchartrain was completed. Nevertheless, the highway distance between New Orleans and Hammond was reduced from 90.5 to 68 miles (145.6 to 109.4 km) by eliminating a circuitous route around the eastern side of Lake Pontchartrain through Slidell, Mandeville, and Covington.[16]

Cancellation

While Jefferson Parish completed its section of the route between West End and Kenner in the early 1930s, several factors caused the construction of the remaining link between Kenner and Frenier to be abandoned soon afterward.[17] The route through the LaBranche swamp in St. Charles Parish proved to be the most difficult road construction in the state up to that time,[18] and the heavy expenditure invested became a continual source of controversy. The highway's practical need was questioned as construction progressed on the more important Airline Highway, a streamlined route between New Orleans and Baton Rouge that would parallel the lakeshore route through the area.[19] The death knell, however, was the construction of the Bonnet Carré Spillway in 1933 that bisected the route. A two-mile section of the embankment, not yet surfaced for travel, was severed to provide a path for floodwaters as part of a larger system designed to prevent a re-occurrence of the Great Mississippi Flood of 1927.[17] With three highways—the existing Jefferson Highway, the new Airline Highway, and the proposed Lakeshore Highway—now potentially requiring bridges to cross the spillway, the Lakeshore Highway could no longer be provided for.[20] As a result, the section of the route through Jefferson Parish was scarcely used and only sporadically maintained for automobile traffic.[17]

By 1945, the embankment had eroded considerably and was no longer adequate in terms of flood protection for the growing suburban development in the parish.[17] Over the next few years, a new levee system was constructed by improved methods on the land side of the original embankment, which was then abandoned as a public road. Only a small segment through the populated area of Bucktown was encompassed by the new levee and remains in use today. A bridge crossing the 17th Street Canal on the Jefferson–Orleans parish line connects it with the portion within the city of New Orleans. Popularly known as Old Hammond Highway, the road is signed as Metairie–Hammond Highway on the Jefferson Parish side and as NO–Hammond Highway on the New Orleans side.[2]

With the abandonment of the Lakeshore Highway, US 51 remained co-signed with US 61 into New Orleans. This routing was officially recognized by the American Association of State Highway Officials (AASHO) on July 22, 1939 and took effect on January 1, 1940.[21] A decade later, however, the Louisiana Department of Highways eliminated several unnecessary U.S. Highway concurrencies and truncated the route of US 51 to the junction with US 61 in LaPlace.[8][9] The portion of the old Lakeshore Highway in New Orleans and the Bucktown neighborhood in Jefferson Parish remained in the state highway system as a disconnected part of Route 33 until the 1955 Louisiana Highway renumbering. The remainder of US 51 carried no state route designation after the renumbering, which eliminated unnecessary concurrencies between U.S. and state routes.[22]

Improvements and alignment changes

Paving projects during the late 1920s and early 1930s led to the early realignment of two portions of US 51 in Tangipahoa Parish. The original route between Independence and Amite City followed what is now known as Old US 51 and remained for a time in the pre-1955 state highway system as State Route 1094. The original route between Tangipahoa and Kentwood is still state-maintained as portions of LA 1050, LA 1051, and LA 1049. The entire route of US 51 in Louisiana was paved by 1938.[23][24]

A new fixed-span bridge over Pass Manchac was completed in August 1957 on the west side of the original bridge,[25] which was utilized as a fishing pier until being destroyed by fire in 1969.[26] The four-lane bypass of Ponchatoula and Hammond was completed around the end of 1960. It was the first section of I-55 to open in Louisiana as well as one of the first completed projects of the Interstate Highway System in the state.[27] US 51 was immediately moved onto the bypass, and the original alignment traversing the center of both cities was designated as US 51 Bus..

The entire portion of US 51 between Frenier and the Ponchatoula bypass was reconstructed between the late 1950s and mid-1960s. This road now serves as the I-55/US 51 frontage road. The original roadbed, still visible on the east side of the frontage road, had continually suffered from subsidence and was promptly abandoned. The new road was meant to carry one direction of traffic on I-55 and was to be paired with an elevated span carrying the opposite lanes.[28] In 1972, plans changed to the current configuration of a double elevated span with the ground-level road serving as a frontage road.[29] Plans for a frontage road on the opposite side of the elevated highway were proposed but eventually abandoned.[30] The new twin-span elevated highway was opened around 1980,[31][32] and official Louisiana highway maps indicate that US 51 remained on the ground-level route for two or three years before being shifted onto the interstate alignment.[32][33] With a length of 22.8 miles (36.7 km), the elevated section of I-55/US 51 (known as the Manchac Swamp Bridge) became one of the longest bridges over water in the world.[citation needed] Free from flooding and subsidence, it provides a vital hurricane evacuation route for the New Orleans metropolitan area.

The final realignment of US 51 to date shifted the route through LaPlace from Main Street, a narrow two-lane thoroughfare, onto a parallel five-lane alignment completed in 1985.[34]

Future

La DOTD is currently engaged in a program that aims to transfer about 5,000 miles (8,000 km) of state-owned roadways to local governments over the next several years.[35] Under this plan of "right-sizing" the state highway system, the portion of US 51 between I-55 and US 190 in Hammond is proposed for deletion as it does not meet a significant interurban travel function. The portions of US 51 Bus. not concurrent with US 190 or LA 22 are also to be transferred to local control.[36]

Major intersections

Parish Location mi[2] km Exit Destinations Notes
St. John the Baptist LaPlace 0.0 0.0 US 61 (West Airline Highway) – New Orleans, Baton Rouge Southern terminus
2.9–
3.1
4.7–
5.0
I-10 – New Orleans, Baton Rouge Exit 209 on I-10
3.3–
3.9
5.3–
6.3
1 I-55 south to I-10 west – New Orleans South end of I-55 concurrency; northbound entrance and southbound exit
3.9 6.3 South end of Manchac Swamp Bridge
Ruddock 10.4–
11.0
16.7–
17.7
7 Ruddock
St. John the BaptistTangipahoa line Manchac 17.2–
17.9
27.7–
28.8
Bridge over Pass Manchac
Tangipahoa 18.1–
18.7
29.1–
30.1
15 Manchac
25.8 41.5 North end of Manchac Swamp Bridge
25.9 41.7 22 Frontage Road Northbound entrance and southbound exit
26.3–
26.8
42.3–
43.1
23
US 51 Bus. north – Ponchatoula
Southern terminus of US 51 Bus.
Ponchatoula 28.8–
29.2
46.3–
47.0
26 LA 22 – Ponchatoula, Springfield
Hammond 31.3–
31.8
50.4–
51.2
28 I-55 north – Jackson North end of I-55 concurrency
33.4 53.8 LA 1040 west (Chauvin Road) Eastern terminus of LA 1040
33.7 54.2
US 51 Bus. south / US 190 (West Thomas Street) to I-55
Northern terminus of US 51 Bus.
33.9 54.6 LA 3260 west (West Church Street) to I-55 Eastern terminus of LA 3260
35.0 56.3 LA 3234 (West University Avenue) to I-55 To Southeastern Louisiana University
Natalbany 36.8 59.2 LA 1064 (Natalbany Road)
Tickfaw 38.9 62.6 LA 442 east South end of LA 442 concurrency
39.0 62.8 LA 442 west to I-55 North end of LA 442 concurrency
Independence 43.0 69.2 LA 1063 west (West 5th Street)
LA 1065 south (Tiger Avenue)
Eastern terminus of LA 1063; northern terminus of LA 1065
43.3 69.7 LA 40 (West 3rd Street) to I-55 – Loranger, Husser
Amite City 49.6 79.8 LA 16 (West Oak Street) to I-55 – Montpelier, Franklinton
Arcola 53.1 85.5 LA 10 east – Franklinton South end of LA 10 concurrency
53.3 85.8 LA 1048 west to I-55 Eastern terminus of LA 1048
Fluker 56.4 90.8 LA 10 west to I-55 – Greensburg North end of LA 10 concurrency
Tangipahoa 59.9 96.4 LA 440 (Center Street) to I-55 – Chesbrough, Spring Creek
Kentwood 64.2 103.3 LA 38 (Avenue G) to I-55 – Mt. Hermon, Clinton
65.2 104.9 LA 1053 north Southern terminus of LA 1053
Greenlaw 67.9 109.3 LA 1054 east Northern terminus of LA 1054
69.1 111.2 US 51 north – McComb Northern terminus; continuation in Mississippi
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

Business route


U.S. Highway 51 Business
Location: Ponchatoula–Hammond
Length: 8.81 mi[1] (14.18 km)
Existed: 1960–present

U.S. Highway 51 Business (US 51 Bus.) runs 8.81 miles (14.18 km) in a general north–south direction through Ponchatoula and Hammond, two neighboring cities in Tangipahoa Parish.[1] It follows the original route of US 51 through the area before the completion of the I-55 bypass just to the west in 1960.[27][37]

From the south, US 51 Bus. begins at an interchange with the concurrent I-55/US 51 at exit 23. It branches to the north as an undivided two-lane highway alongside the Canadian National Railway (CN) line through the thickly wooded swamp into Ponchatoula, traveling on Southwest Railroad Avenue. After two miles (3.2 km), the highway reaches the center of town and intersects LA 22 (West Pine Street), an undivided four-lane thoroughfare. US 51 Bus. turns west to follow LA 22, flanked by rows of historic brick storefronts. Just short of a cloverleaf interchange with I-55, US 51 Bus. turns back to the north opposite the Ponchatoula Cemetery. Proceeding as a two-lane highway with a center turning lane, US 51 Bus. crosses from Ponchatoula into the city of Hammond just past the North Oaks Medical Center.[4][5][38]

Shortly afterward, the highway passes through a diamond interchange with I-12, a northern bypass of the New Orleans metropolitan area connecting with Baton Rouge and Slidell. The route initially widens to four lanes with its center lane intact, but its travel lanes divide onto the one-way couplet of South Railroad Avenue and South Oak Street as it approaches the center of town. Here, US 51 Bus. intersects US 190, the city's main east–west thoroughfare, which follows the one-way couplet of Morris and Thomas Streets. The route turns west concurrent with US 190 and heads through the downtown area. After a dozen blocks, the east and westbound lanes converge as West Thomas Street widens to four lanes. Soon afterward, US 51 Bus. terminates at an intersection with its parent route at Morrison Boulevard.[4][5][38]

US 51 Bus. is classified by the Louisiana Department of Transportation and Development (La. DOTD) as an urban minor arterial in Ponchatoula and as an urban principal arterial in Hammond. The average daily traffic volume in 2013 was reported as reaching peaks of 28,000 and 31,500 vehicles in Ponchatoula and Hammond, respectively. The lowest figure reported was 4,800 vehicles daily through the sparsely populated swamp at its southern end.[1] The posted speed limit ranges from 25 mph (40 km/h) through the center of both cities to 55 mph (90 km/h) in more rural areas.[38]

The route was part of mainline US 51 from its creation in 1926 until its realignment onto I-55 in 1960.[27] It was also part of State Route 33 until the 1955 Louisiana Highway renumbering when unnecessary concurrencies between U.S. and state routes were discontinued.[22][39]

Major intersections
The entire highway is in Tangipahoa Parish.

Location mi[38] km Destinations Notes
0.0 0.0 I-55 / US 51 – Hammond, New Orleans Southern terminus; Exit 23 on I-55
Ponchatoula 2.0 3.2 LA 22 east (East Pine Street) – Madisonville South end of LA 22 concurrency
2.9 4.7 LA 22 west (West Pine Street) to I-55 – Springfield North end of LA 22 concurrency
Hammond 5.6–
5.8
9.0–
9.3
I-12 – Baton Rouge, Slidell Exit 40 on I-12
7.4 11.9 US 190 east (East Morris Street, East Thomas Street) – Covington South end of US 190 concurrency; one-way couplet
8.8 14.2 US 51 (Morrison Boulevard) to I-55 – Ponchatoula, Amite City
US 190 west (West Thomas Street) to I-55 – Baton Rouge
Northern terminus; north end of US 190 concurrency
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

References

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  13. The Times-Picayune. April 17, 1927.[full citation needed]
  14. The Times-Picayune. April 2, 1927.[full citation needed]
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  16. The Times-Picayune. March 20, 1927//[full citation needed]
  17. 17.0 17.1 17.2 17.3 Lua error in package.lua at line 80: module 'strict' not found.
  18. The Times-Picayune. March 18, 1926.[full citation needed]
  19. The Times-Picayune. January 27, 1929.[full citation needed]
  20. The Times-Picayune. August 30, 1928.[full citation needed]
  21. Lua error in package.lua at line 80: module 'strict' not found.
  22. 22.0 22.1 Lua error in package.lua at line 80: module 'strict' not found.
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  28. The Times-Picayune. May 20, 1970.[full citation needed]
  29. The Times-Picayune. March 1, 1972.[full citation needed]
  30. The Times-Picayune. August 23, 1973.[full citation needed]
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External links

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U.S. Route 51
Previous state:
Terminus
Louisiana Next state:
Mississippi