Louisiana Highway 70

Louisiana Highway 70
Route information
Maintained by Louisiana DOTD
Length	51.2 mi[1] (82.4 km)
Major junctions
South end	Future I-49 / US 90 / LA 182 in Morgan City
Major intersections	LA 69 south of White Castle LA 1 north of Paincourtville LA 3127 near Donaldsonville LA 18 near Donaldsonville LA 44 near Sunshine LA 3125 near Sunshine
North end	LA 22 near Sorrento
Location
Country	United States
State	Louisiana
Parishes	St. Mary, St. Martin, Assumption, Ascension, St. James
Highway system
Louisiana State Highway System Interstate US State Scenic
← LA 69 → US 71

Louisiana Highway 70 (LA 70) is a state highway in Louisiana that serves St. Mary, St. Martin, Assumption, and Ascension parishes. It is primarily a two-lane highway that spans 51.2 miles (82.4 km).^[1]

LA 70 begins at an exit from U.S. Highway 90 in Morgan City. Within the same interchange, US 90 Business and LA 182 pass underneath US 90. LA 70 then heads north into Assumption Parish, where it runs through Pierre Part. In Paincourtville, LA 70 intersects LA 1 via Louisiana Highway 70 Spur, a 1.6-mile-long (2.6 km) connector road. LA 70 then continues northeastward through rural Ascension Parish as a two-lane, undivided road. LA 70 widens to a four lane, undivided road at an intersection with LA 3089. LA 70 then crosses the Mississippi River via the Sunshine Bridge. LA 70 then narrows back to a two lane undivided road after intersecting LA 44 and continues northeastward until it ends at an intersection with LA 22, just south of Interstate 10.^[1]

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Originally, LA 70 was a much shorter route serving only Assumption Parish and only approximately 17 miles in length. Until the late 1950s, the road went from Pierre Part to Paintcourtville, with its southern terminus being near Belle River in Assumption Parish (four miles south of Pierre Part) and northern terminus at LA 1. In 1958, a swing bridge was built on Belle River, and the road was extended southward to parallel the Atchafalaya River through Lower St. Martin and upper St. Mary Parish to reach Morgan City.

The northern extension of LA 70 from Paincourtville/Plattenville to Sorrento/I-10 occurred in 1977. The road was extended from LA 1, crossing Bayou Lafourche, to LA 3089. LA 70 then assumed most of LA 3089's original routing, crossing the Sunshine Bridge to connect to LA 22 near I-10 in Sorrento.

Parish	Location	mi[1]	km	Destinations	Notes
St. Mary	Morgan City	0.0– 0.1	0.0– 0.16	US 90 / US 90 Bus. east / LA 182 (Brasher Avenue) – New Orleans, Lafayette, Berwick, Houma	Interchange with US 90; western terminus of US 90 Bus.
St. Martin	​	16.1	25.9	LA 997 north	Southern terminus of LA 997
Assumption	​	16.3	26.2	LA 1016-2 south (Belle River Road)	Southern end of LA 1016-2 concurrency
	​	16.3	26.2	LA 1016-2 north (Belle River Road)	Northern end of LA 1016-2 concurrency
	Pierre Part	17.2	27.7	LA 1016-1 south (Shell Beach Road) – Lake Verret Shell Beach	Northern terminus of LA 1016-1
		20.1	32.3	LA 1015-2 south (South Bay Road)	Northern terminus of LA 1015-2
		20.2	32.5	LA 1015-1 south (Bay Road) / North Curtis Street	Northern terminus of LA 1015-1
	Grand Bayou	27.8	44.7	LA 69 north	Southern terminus of LA 69
	​	29.4	47.3	LA 996 north	Southern terminus of LA 996
	​	31.0	49.9	LA 1004 south	Northern terminus of LA 1004
	​	32.2	51.8	LA 1004 north	Southern terminus of LA 1003
	Paincourtville	32.8	52.8	LA 1 – Napoleonville
	​	32.9	52.9	LA 308
	​	35.0	56.3	LA 70 Spur south	Northern terminus of LA 70 Spur
Ascension	​	40.2	64.7	LA 3127 east – Vacherie	Western terminus of LA 3127
	​	41.1– 41.7	66.1– 67.1	LA 3089 north – Donaldsonville	Southern terminus of LA 3089
	​	42.9	69.0	LA 3120 north	Southern terminus of LA 3120
St. James	Lemannville	43.5	70.0	To LA 18
Mississippi River		43.9– 45.2	70.7– 72.7	Sunshine Bridge
St. James	Union	45.2– 45.7	72.7– 73.5	LA 44 – The Houmas, Poché Plantation, Bocage Plantation	Interchange
		46.9	75.5	LA 3125 east – Convent, Lutcher, Gramercy	Western terminus of LA 3125
Ascension	Sorrento	51.2	82.4	LA 22 – The Houmas, Bocage Plantation
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus

Louisiana Highway 70 Spur
Location	Paincourtville
Length	1.6 mi[2] (2.6 km)
Existed	1977–present

This section needs expansion. You can help by adding to it. (January 2010)

LA 70 Spur is a 1.6-mile-long (2.6 km) connector route between LA 70 and LA 1 in Plattenville.^[2] The route was created in 1977 with the extension of LA 70 from Paincourtville to the Sunshine Bridge as a bypass from Paincourtville to provide a more direct route to LA 1 and LA 308 and interests in Assumption Parish and southbound.^{[citation needed]}

Major junctions The entire highway is in Assumption Parish.

Location	mi[2]	km	Destinations	Notes
Paincourtville	0.0	0.0	LA 1
Plattenville	0.1	0.16	LA 308
​	1.6	2.6	LA 70
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

• Map of State Highways in Louisiana
• Louisiana State Highway Log