LA 454 initially heads southeast from LA 107 (Old Marksville Highway) in Cedar Grove toward the Red River. After passing through an area known as Ruby, the route curves to the east and crosses from Rapides Parish into Avoyelles Parish. LA 454 then loops back to the northeast to a terminus at the concurrent LA 107 and LA 115 in Effie.
Louisiana Highway 466 (LA 466) runs 0.85 miles (1.37 km) in an east–west direction along 5th and Kepler Streets in Gretna from LA 18 (Lafayette Street) to LA 23 (Franklin Avenue). It is an undivided two-lane highway for its entire length. As of 2019, it is under agreement to be removed from the state highway system and transferred to local control.
The route heads north from US 71, traveling through timber lands and hills. In Verda, the route turns slightly westward and runs concurrent with LA 122 for about 1 mile (1.6 km). After turning back to the north, LA 471 crosses from Grant Parish into Winn Parish, where it continues to an intersection with LA 34 just outside Atlanta. LA 471 is an undivided two-lane highway for its entire length.
Before the 1955 renumbering, LA 471 was a small part of State Route 5, which was followed by the original alignment of US 167.
Louisiana Highway 472 (LA 472) runs 20.24 miles (32.57 km) in a north–south direction from US 167 at Williana, Grant Parish to a second junction with US 167 southeast of Winnfield, Winn Parish. Despite its physical direction, LA 472 is signed east–west.
LA 472 heads northeast from US 167 through the Kisatchie National Forest in Grant Parish and makes a jog at LA 500. The route then proceeds due north and crosses into Winn Parish. After a few miles, LA 472 curves to the northwest and rejoins US 167 about 4 miles (6.4 km) south of Winnfield.
LA 478 heads east from Vowells Mill through the Kisatchie National Forest. It crosses both LA 117 and LA 120 before passing through an interchange with I-49 at Exit 132 just inside the Natchitoches city limits. (The route is co-signed with Natchitoches Parish Route 620 in this vicinity). LA 478 proceeds northeast to a point on LA 1 about 2 miles (3.2 km) north of Natchez. LA 478 is an undivided two-lane highway for its entire length.
The route heads northeast from US 171 in Noble and curves due north at Sardis. Reaching Oak Grove, a point east of Converse, LA 483 turns east in a brief concurrency with LA 174 before resuming its northward course at Mitchell. It proceeds in a general northeast direction and encounters a series of curves as it crosses from Sabine Parish into DeSoto Parish. Soon after crossing the parish line, LA 483 heads due north again and intersects LA 512. It immediately curves northeast into the small community of Pelican where it intersects LA 513. LA 483 proceeds a short distance to its terminus at LA 175 on the east side of town. It is an undivided two-lane highway for its length.
LA 490 is an undivided, surfaced two-lane highway that continues the path of a dirt local road northeast through Janie. In Chopin, the highway passes through a diamond interchange with I-49 (exit 113) and crosses the Union Pacific Railroad line at grade. It then passes the entrance to the Martco lumber factory and crosses over the Cane River. At a T-intersection with LA 1, LA 490 turns southeast and runs concurrent with that highway for 2.4 miles (3.9 km) and crosses the Cane River a second time. LA 490 turns northeast off of LA 1 and winds through Galbraith and Marco, intersecting LA 3279 between those points. At the end of its route, LA 490 provides access to, and makes a loop in front of, the Red River Lock & Dam #3.
For a time, LA 490 resumed on the opposite bank of the Red River in Colfax, following Faircloth and 2nd Streets to a junction with LA 8. A spur continued along Faircloth Street past 2nd Street to a junction with LA 158. Prior to the 1930s, the two segments of LA 490 were connected by the West End Ferry. During this time, LA 490 was designated as State Route 431 in the original state highway system, which was in use from 1921 to 1955.
A rural route connecting US 71 and LA 8 south of Colfax, LA 492 served as the original alignment of both US 71 and its predecessor, the Jefferson Highwayauto trail. It is an undivided two-lane highway for its length.
^Louisiana Department of Transportation and Development Office of Multimodal Planning (February 2012). Natchitoches Parish (South Section)(PDF) (Map). Louisiana Department of Transportation and Development. Retrieved March 20, 2016.
^Louisiana Department of Transportation and Development Office of Planning and Programming (1998). Grant Parish (Map). Louisiana Department of Transportation and Development.
^ ab"Act No. 294, House Bill No. 791". State-Times. Baton Rouge. July 31, 1928. p. 11B.