Louisiana Highway 631
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| Louisiana Highway 631 |
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| Length: | 9.09 mi (14.63 km) | ||||||||
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| West end: |  US 90 in Des Allemands |
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| East end: |  LA 52 in Boutte |
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Louisiana Highway 631 (LA 631) is a state highway in Louisiana that serves Lafourche and St. Charles Parishes. It spans a total of 9.09 miles from west to east. It is known locally as the Old Spanish Trail.
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[edit] Route description
LA 631 was the original route of US 90 before its current neighboring four-lane alignment was constructed. Its entire length parallels US 90 and the nearby railroad line. From the west, it begins at an intersection with US 90 in extreme eastern Lafourche Parish, just before Bayou Des Allemands. Crossing the bayou, it heads into St. Charles Parish and through the main part of Des Allemands. There it crosses the LA 631 Spur, LA 632, and LA 635. Just before Paradis, it meets LA 306. It ends a few miles further to the northeast in Boutte at an intersection with LA 52 just after crossing under (but not connecting to) Interstate 310/LA 3127.
LA 631 is an undivided, two lane highway for its entire length.
[edit] Junction list
| Parish | Location | Mile | Junction | Notes | |
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| Lafourche | Des Allemands | Western terminus of  LA 631 |
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| 0.00 | US 90 |
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| St. Charles | Des Allemands | 0.9 |  Spur LA 631 |
Western terminus of Spur LA 631 | |
| 1.3 |  LA 632 (Levee Road) |
Western terminus of LA 632 | |||
| Paradis | 3.6 |  LA 635 |
Western terminus of LA 635 | ||
| 5.5 |  LA 306 (Bayou Gauche Road) |
Northern terminus of LA 632 | |||
| Boutte |   I-310/LA 3127 viaduct passes under overhead (No access) |
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| 9.09 | LA 52 (Paul Maillard Road) |
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| Eastern terminus of LA 631 |
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[edit] Spur Louisiana Highway 631
Spur Louisiana Highway 631 (Spur LA 631) is a state highway in Louisiana that serves St. Charles Parish. It spans 0.60 miles in a west to east direction.
[edit] Route description
In Des Allemands, LA 631 turns northward a few blocks away from US 90. Spur LA 631 continues on the same eastward trajectory. It intersects LA 632 before ending at an antiquated interchange with US 90.
Spur LA 631 is an undivided, two lane highway for its entire length.
[edit] Junction list
| Parish | Location | Mile | Junction | Notes | |
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| St. Charles | Des Allemands | Western terminus of Spur LA 631 |
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| 0.00 | LA 631 (Old Spanish Trail) |
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| 0.3 | LA 632 (Levee Road) |
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| 0.60 | US 90 |
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| Eastern terminus of Spur LA 631 |
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