Louisiana Highway 354 (LA 354) runs 2.31 miles (3.72 km) in a southwest to northeast direction from a junction with LA 341 to LA 31 in St. Martin Parish.
The route was 0.06 miles (0.097 km) long, connecting LA 1 and LA 308 which run along the west and east banks of the bayou, respectively. It was an undivided two-lane highway for its entire length.
Louisiana Highway 365 (LA 365) runs 20.91 miles (33.65 km) in a general east–west direction from LA 370 east of Iota to LA 98 east of Mire, Acadia Parish.[19]
The route heads east from LA 370 and makes a zigzag via LA 13. Continuing east through Branch, LA 365 intersects LA 35 southwest of Church Point. East of Branch, LA 365 passes through a point known as Higginbotham and intersects LA 95. The highway then zigzags to the southeast and reaches the St. Landry Parish line. Here, it turns due south and proceeds to a point on LA 98 between Mire and Carencro.[19][20][21]
Louisiana Highway 366 (LA 366) runs 0.80 miles (1.29 km) in a northwest to southeast direction along Patterson Street from US 165 to LA 8 in Pollock, Grant Parish.[22]
The route heads north from exit 27 on I-10 and travels along Sampson Street, an undivided four-lane highway with a center turning lane, through the city of Westlake. North of town, LA 378 narrows to two lanes and makes a zigzag east onto Phillips Road and north onto Davis Road to cross a vertical lift bridge over the West Fork of the Calcasieu River. Curving due east onto Sam Houston Jones Parkway, the route again widens to four lanes with a center lane and intersects LA 378 Spur, which provides access to Sam Houston Jones State Park. LA 378 continues east to its terminus at US 171 in the unincorporated community of Moss Bluff.[32][34]
Louisiana Highway 390 (LA 390) runs 2.77 miles (4.46 km) in an east–west direction along West Main Street from Maggie Hebert Road, a local road, to LA 27 in Hackberry, Cameron Parish.[43]
The route heads north from LA 112 and crosses from Beauregard Parish into Vernon Parish.[49][50][51] It then curves to the northeast for 6.9 miles (11.1 km) to an intersection with LA 10 at Cravens. LA 399 turns east to follow LA 10 briefly before resuming a northeastern course to Fullerton. Here it intersects LA 458 and turns north to continue the route of that highway past Fullerton Lake to the end of state maintenance at Lookout Road, a local road. The northernmost section of the route is located within the Vernon Unit of the Kisatchie National Forest. LA 112 is an undivided two-lane highway for its entire length.[49][52][53]
^Lafourche Parish (North Section) (Map) (January 1, 1955 ed.). Cartography by Department of Highways Traffic and Planning Section. Louisiana Department of Highways. 1953.
^"Act No. 40, House Bill No. 311". State-Times. Baton Rouge. June 18, 1955. pp. 3B–7B.
^Acadia Parish(PDF) (Map). Cartography by La DOTD Office of Multimodal Planning. Louisiana Department of Transportation and Development. February 2012. Retrieved October 18, 2013.
^Louisiana Department of Transportation and Development Office of Multimodal Planning (February 2012). Calcasieu Parish (East Section)(PDF) (Map). Louisiana Department of Transportation and Development. Retrieved March 31, 2016.
^Beauregard Parish (East Section)(PDF) (Map). Cartography by La DOTD Office of Multimodal Planning. Louisiana Department of Transportation and Development. February 2012. Retrieved October 8, 2013.
^Vernon Parish (East Section)(PDF) (Map). Cartography by La DOTD Office of Multimodal Planning. Louisiana Department of Transportation and Development. February 2012. Retrieved October 8, 2013.