Louisiana Highway 21

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Louisiana Highway 21 marker

Louisiana Highway 21
Route information
Maintained by Louisiana DOTD
Length: 51.76 mi (83.30 km)
Existed: 1955 renumbering – present
Major junctions
South end: LA 22 / LA 1077 in Madisonville
  I-12 in Covington
US 190 in Covington
LA 36 in Covington
LA 59 south of Waldheim
LA 40 south of Bush
LA 41 in Bush
LA 16 in Sun
LA 10 in Bogalusa
North end: MS 35 at state line
Highway system
  • Louisiana Highway System
LA 20 LA 22

Louisiana Highway 21 (LA 21) is a state highway in Louisiana that serves St. Tammany and Washington Parishes. It spans 51.76 miles (83.30 km) and is bannered north/south.

Route description[edit]

From the south, LA 21 begins at an intersection with Louisiana Highway 22 and Louisiana Highway 1077 in Madisonville, where LA 21 assumes the trajectory of LA 1077 and heads northeast. LA 1077 branches to the northwest before LA 21 intersects Interstate 12.[1] From south of I-12 and until joining US 190 Business on 21st Avenue in Covington, LA 21 is multilane, in places divided by a median or by a center turn lane, with some control of access.[2]

Improved, multilane, divided section of LA 21 between Covington and Madisonville. See also list of numbered highways in Louisiana.

Through most of Covington LA 21 is in a mostly two-lane undivided concurrency with US 190 Business, which returns to U.S. Route 190 on the east side of Covington—an area known as Claiborne Hill. After intersecting US 190 and before leaving Covington cosigned as Military Road, LA 21 absorbs LA 36 and continues northeastward, absorbing LA 59 and entering a brief concurrency with Louisiana Highway 40 in Bush for less than one mile (1.6 km). Between Bush and Sun, LA 21 widens to a four lane, divided highway after merging Louisiana Highway 41, continuing due north from the merge. In Sun LA 21 absorbs LA 16 and continues northward to Bogalusa, where LA 21 intersects LA 10. LA 21 then runs north through Varnado and Angie before becoming Mississippi Highway 35 at the state line.

Major intersections[edit]

Parish Location mi km Destinations Notes
St. Tammany Madisonville LA 22 (Mulberry Street) / LA 1077 south (Main Street) – Fairview Riverside State Park, Maritime Museum south end of LA 1077 overlap
LA 1077 north to I-12 north end of LA 1077 overlap
I-12 – Hammond, Slidell I-12 exit 59
US 190 Bus. west (West 21st Avenue)
south end of US 190 Bus. overlap
US 190 west to I-12 – Mandeville, New Orleans interchange

US 190 Bus. east to US 190 – Franklinton
north end of US 190 Bus. overlap
LA 36 east – Abita Springs
LA 1082 north
LA 59 south – Abita Springs
LA 1084 east
Waldheim LA 1083 south south end of LA 1083 overlap
LA 1083 north north end of LA 1083 overlap
LA 40 west south end of LA 40 overlap
LA 40 east north end of LA 40 overlap
LA 41 south
Sun LA 16 west
Washington LA 1075 north
LA 3124 north – Bogalusa Central Business District
Bogalusa LA 10
LA 436 east
LA 436 – Pine, Franklinton
Varnado LA 436-1 east
Angie LA 1071 east
LA 438 west south end of LA 438 overlap
LA 438 east north end of LA 438 overlap
MS 35 north – Columbia Mississippi state line
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  1. ^ LA 1077 has a separate interchange with I-12.
  2. ^ As of 2010 much of the stretch between I-12 and 21st Avenue remained under reconstruction amid traffic jams.

External links[edit]

KML is from Wikidata