# Louisiana Highway 42

Louisiana Highway 42 (LA 42) is a state highway in Louisiana that serves East Baton Rouge, Ascension, Livingston, and Tangipahoa parishes. It spans 47.8 miles (76.9 km) in a general east–west direction.

## Route description

From the west, LA 42 starts at an intersection with LA 30 in Baton Rouge near Louisiana State University. It is a four-lane divided highway for 7.6 miles (12.2 km) from LA 30 eastward to an intersection with Highland Road and Siegen Lane in southeastern Baton Rouge. This section is named Burbank Drive.
From this intersection, LA 42 turns east and follows Highland Road to US 61 (Airline Highway). In this segment, it passes the Highland Road Park and Observatory and the Louisiana Country Club. Curving to the northeast, LA 42 widens to four lanes and passes through an interchange with I-10 (exit 166).
LA 42 turns southeast and overlaps US 61 out of East Baton Rouge Parish and into Ascension Parish for 3.3 miles (5.3 km). At this point, LA 42 turns eastward and meanders its way across the Amite River and into Livingston Parish, intersecting LA 16 at Port Vincent. For the next 3.1 miles (5.0 km), LA 42 and LA 16 run concurrently into the north end of French Settlement. LA 42 proceeds eastward through rural Livingston Parish until reaching its terminus at LA 22 in the town of Springfield. As of 2018, the portion west of US 61 is under agreement to be removed from the state highway system and transferred to local control.

## Future

* Burbank Road Widening Project - Complete Baton Rouge Green Light Project
* LA42 Widening Project - Ascension Parish Louisiana. Louisiana DOTD LA42 Project

## Major intersections

| Parish | Location | mi | km | Destinations | Notes |
| East Baton Rouge | Baton Rouge | 0.0 | 0.0 | LA 30 (Nicholson Drive) | Western terminus |
| East Baton Rouge | ​ | 4.8 | 7.7 | LA 327 Spur south (Gardere Lane) | |
| East Baton Rouge | ​ | 5.7 | 9.2 | LA 1248 (Bluebonnet Boulevard) | |
| East Baton Rouge | ​ | 7.6 | 12.2 | LA 3246 north (Siegen Lane) | Southern terminus of LA 3246 |
| East Baton Rouge | ​ | 10.9 | 17.5 | LA 427 north (Perkins Road) | West end of LA 427 concurrency |
| East Baton Rouge | ​ | 11.0 | 17.7 | I-10 – Baton Rouge, New Orleans | |
| East Baton Rouge | Kleinpeter | 11.3 | 18.2 | LA 427 south (Perkins Road East) | East end of LA 427 concurrency |
| East Baton Rouge | ​ | 12.6 | 20.3 | US 61 north (Airline Highway) LA 948 (Highland Road) | West end of US 61 concurrency; western terminus of LA 948 |
| Ascension | ​ | 14.9 | 24.0 | LA 427 (Perkins Road) | |
| Ascension | Oak Grove | 15.9 | 25.6 | US 61 south (Airline Highway) | East end of US 61 concurrency |
| Ascension | Oak Grove | 16.0 | 25.7 | LA 73 (Jefferson Highway) | |
| Ascension | Little Prairie | 19.2 | 30.9 | LA 44 | Western terminus of LA 44 |
| Ascension | ​ | 22.8 | 36.7 | LA 933 | Eastern terminus of LA 933 |
| Ascension | ​ | 24.1 | 38.8 | LA 431 | Northern terminus of LA 431 |
| Ascension–Livingston parish line | Port Vincent | 24.2 | 38.9 | Bridge over Amite River | Bridge over Amite River |
| Livingston | Port Vincent | 24.4 | 39.3 | LA 16 west – Denham Springs | West end of LA 16 concurrency |
| Livingston | French Settlement | 27.5 | 44.3 | LA 16 east – French Settlement | East end of LA 16 concurrency |
| Livingston | Frost | 35.0 | 56.3 | LA 63 north – Livingston | |
| Livingston | ​ | 41.9 | 67.4 | LA 441 north – Holden | Southern terminus of LA 441 |
| Livingston | ​ | 46.8 | 75.3 | LA 43 north – Albany | Southern terminus of LA 43 |
| Livingston | Springfield | 47.8 | 76.9 | LA 22 – Ponchatoula LA 1037 | Eastern terminus |
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi Concurrency terminus ||||||