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Interstate 12 shield
Interstate 12
Main route of the Interstate Highway System
Maintained by LaDOTD
Length: 85.59 mi[1] (137.74 km)
West end: I-10 in Baton Rouge
Major
junctions:
US 61 in Baton Rouge
I-55 near Hammond
LA 445 south of Robert
LA 1077 near Goodbee
LA 21 near Madisonville
US 190 between Covington and Mandeville
East end: I-10 / I-59 near Slidell
Highways in Louisiana
< LA 11 LA 12 >

Interstate 12 (I-12) is an intrastate Interstate Highway located entirely within the state of Louisiana. I-12 starts in Baton Rouge at Interstate 10, and travels along the North Shore of Lake Pontchartrain before ending at the intersection of Interstate 10 and Interstate 59 near Slidell[2]. I-12 is only 85 miles long between Baton Rouge and Slidell, while I-10 takes 108 miles to travel between the same two points, so I-12 is heavily-used as a shortcut for through traffic on I-10. I-12 is six lanes from its western terminus until Exit 7 (O'Neal Lane) at which point it becomes a four-lane highway to its eastern terminus.

In 1993, the state legislature renamed Interstate 12 as the "Republic of West Florida Parkway". In 2003, signs identifying the highway's official name and bearing the flag of the Republic of West Florida were erected by the Louisiana Department of Transportation and Development in order to highlight the unique history of Louisiana's Florida Parishes.

The highway is relatively short for a mainline route at only 85 miles (137 km). While Interstates 19, 66, 97, and the partially-completed Interstate 99 are all shorter, none of these has two termini with the same route, much less within the same state (I-99 will eventually extend into New York). Compare the length of I-12 to that of the 73.5-mile (118.3 km) I-295 in New Jersey and Delaware, or the 72.8-mile (117.2 km) I-405 in California, or even the 121-mile (195 km) I-495 in Massachusetts both of which are auxiliary Interstate Highways.

Contents

Route description

I-12 breaks away from I-10 near Baton Rouge. It is used as a main route around New Orleans and Lake Pontchartrain. I-12 continues East passing through the suburbs of Baton Rouge. It makes an interchange with I-55 near Hammond. It crosses scenic streams the Tangipahoa River south of Robert, Sims Creek southeast of Goodbee, and Tchefuncte River north of Madisonville. I-12 ends at I-10 (Heading East and South) and I-59 (Heading North) near Slidell.

History

With major damage to the I-10 Twin Span Bridge across Lake Pontchartrain from Hurricane Katrina, I-12 was temporarily functioning as I-10. On October 14, 2005, the eastbound span of I-10 over Lake Pontchartrain was reopened to two-way traffic. The westbound span of I-10 reopened on January 6, 2006, with speed, weight and size restrictions, relieving I-12 of much of the congestion that was clogging it from the Lake Pontchartrain Causeway to the junction with I-10 and I-59.

Exit list

Parish Location # Destinations Notes
East Baton Rouge Baton Rouge I-10 west – Baton Rouge
1A I-10 east – New Orleans
1B LA 3064 (Essen Lane) to LA 73 (Jefferson Highway) Eastbound exit only and east & west bound entrances.
LA 1068 (Drusilla Lane) to LA 73 (Jefferson Highway) Westbound exit and eastbound entrance only.
2 US 61 (Airline Highway) Alternate route to Baton Rouge Metropolitan Airport.
Signed as exit 2A (south) and 2B (north).
4 Sherwood Forest Boulevard
6 Millerville Road
7 LA 3245 (O'Neal Lane)
Livingston Denham Springs 10 LA 3002Denham Springs
12 LA 1026 (Juban Road) Opened April 20, 2007.[3]
Walker 15 LA 447Port Vincent, Walker
19 Colyell, Satsuma
Livingston 22 LA 63 – Frost, Livingston
29 LA 441Holden
32 LA 43Springfield, Albany
Tangipahoa 35 Pumpkin Center Road, Baptist
38 I-55New Orleans, Jackson Signed as exits 38A (south) and 38B (north)
Hammond 40
US 51 Bus.Ponchatoula, Hammond
Exit to reach Southeastern Louisiana University
43 LA 3158 (Airport Road)
47 LA 445Robert
St. Tammany 57 LA 1077Goodbee
59 LA 21Madisonville, Covington
60 Pinnacle Parkway, East Brewster Road (opening Fall 2009)[4]
63 US 190Mandeville, Covington Exit to reach the Lake Pontchartrain Causeway
Signed as exits 63A (South bound, to Mandeville & Causeway)
and 63B (North bound to Covington).
65 LA 59Mandeville, Abita Springs
74 LA 434Lacombe, St. Tammany
Slidell 80 Northshore Boulevard, Airport Road
83 US 11Slidell, Pearl River
85A I-10 west – New Orleans
85B I-59 north - Hattiesburg
85C I-10 east - Bay St. Louis

References

  1. ^ "Interstate 12 @ Interstate-Guide.com". Interstate Guide. http://www.interstate-guide.com/i-012.html. Retrieved 2008-02-15.  
  2. ^ Google, Inc. Google Maps – overview map of I-12 [map]. Cartography by Tele Atlas. Retrieved on 2008-02-15.
  3. ^ Juban Road interchange at I-12 opens Press release, Louisiana Department of Transportation and Development. Accessed April 21, 2007.
  4. ^ I-12 exits south of Covington to debut in fall
Main Interstate Highways (major interstates highlighted)
4 5 8 10 12 15 16 17 19 20 22 24 25 26 27 29 30
35 37 39 40 43 44 45 49 55 57 59 64 65 66 68 69
70 71 72 73 74 75 76 (W) 76 (E) 77 78 79 80 81 82
83 84 (W) 84 (E) 85 86 (W) 86 (E) 87 88 (W) 88 (E) 89 90
91 93 94 95 96 97 99 (238) H-1 H-2 H-3
Unsigned  A-1 A-2 A-3 A-4 PRI-1 PRI-2 PRI-3
Lists  Primary  Main - Intrastate - Suffixed - Future - Gaps
Auxiliary  Main - Future - Unsigned
Other  Standards - Business - Bypassed
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