Interstate 55 in Louisiana

Interstate 55
Route information
Maintained by Louisiana DOTD
Length:	65.81 mi (105.91 km)
Major junctions
South end:	I-10 in Laplace
	I-12 in Hammond
North end:	I-55 at the Mississippi line
Highway system
Main route of the Interstate Highway System Main • Auxiliary • Business Highways in Louisiana ← LA 54 LA 56 →

Interstate 55 is a major north–south Interstate Highway that serves the middle of the United States. It runs 963.5 miles (1,550.6 km) from Interstate 10 in Laplace, Louisiana - about 25 miles (40 km) west of New Orleans to U.S. 41 in Chicago, Illinois.

Route description

In Louisiana, I-55 begins at I-10 near Laplace and is immediately joined by US 51. Paralleled by Old US 51, it snakes its way between Lake Pontchartrain and Lake Maurepas on its way to Ponchatoula. Much of this part of the journey is through the Manchac Wildlife Management Area aboard the Manchac Swamp bridge. Just south of Ponchatoula US-51 Business splits to head into town, while the interstate and federal route continue their bypass to the west. US 51 itself splits off just before the interchange with I-12. Here, I-55 forms a western bypass of Hammond, while I-12 splits between Hammond and Ponchatoula. North of Hammond, I-55 parallels US 51 all the way to the Mississippi line, bypassing all the rural towns that the federal route passes through.

Exit list

Parish	Location	Mile	Exit	Destinations	Notes
St. John the Baptist	Laplace	0.0		I-10 east – New Orleans	Southbound exit and northbound entrance; Southern terminus of I-55
		0.8	1	US 51 south to I-10 – Baton Rouge, LaPlace	Southbound exit and northbound entrance; southern end of US 51 concurrency
		7.9	7	Ruddock
Tangipahoa		I-55 crosses Pass Manchac between Lake Maurepas and Lake Pontchartrain
		15.5	15	Manchac
		22.7	22	Frontage Road	Southbound exit and northbound entrance
	Ponchatoula	23.8	23	US 51 Bus. north – Ponchatoula
		26.1	26	LA 22 – Ponchatoula, Springfield
	Hammond	28.7	28	US 51 north – Hammond	Northern end of US 51 concurrency
		29.4	29	I-12 – Baton Rouge, Slidell	Signed as exits 29A (east) and 29B (west)
		31.4	31	US 190 – Albany, Hammond
		32.4	32	LA 3234 east (University Avenue) / Wardline Rd
	Tickfaw	36.5	36	LA 442 – Tickfaw
	Independence	41.1	40	LA 40 – Independence
	Amite City	47.0	46	LA 16 – Montpelier, Amite City
	Roseland	50.8	50	LA 1048 – Arcola, Roseland
		53.8	53	LA 10 – Fluker, Greensburg
	Tangipahoa	57.1	57	LA 440 – Tangipahoa
	Kentwood	61.6	61	LA 38 – Kentwood, Liverpool

Interstate 55
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