List of state highways in Louisiana (300–349)

The following is a list of state highways in the U.S. state of Louisiana designated in the 300-349 range.

Louisiana Highway 300

Louisiana Highway 300 runs in a southeast to northwest direction from a dead end in Delacroix to a junction with LA 39 and LA 46 at Sebastopol, St. Bernard Parish.
LA 300 heads northward from the fishing communities of Delacroix and Reggio. The winding and notoriously dangerous road meets LA 46 north of Reggio and turns westward. This section of LA 300 parallels the newer four-lane highway carrying LA 46 to the north. LA 300 proceeds for about farther to its terminus at Sebastopol. It is an undivided two-lane highway for its entire length.
In 1997, the Louisiana DOTD controversially placed two barriers in the road, effectively dividing it into three dead end segments, in an effort to encourage drivers to use the then-newly constructed LA 46, the Judge Perez Extension, which was 4 lanes and divided, saving Bayou Road for more local traffic, as the road has no shoulder at points.

Louisiana Highway 301

Louisiana Highway 301 runs in a southwest to northeast direction along Barataria Boulevard from a dead end at Bayou Villars to LA 45 north of Jean Lafitte, Jefferson Parish.
LA 301 follows the west bank of Bayou Barataria and begins at a point where the bayou is joined by the Gulf Intracoastal Waterway near their intersections with Bayou Villars. After briefly traveling northward, LA 301 curves to the east through a sparsely populated area opposite the town of Jean Lafitte. The route terminates at a T-intersection where southbound LA 45 turns onto a ramp to join LA 3134 on a high-level bridge across Bayou Barataria into Jean Lafitte. Northbound LA 45 continues straight ahead along the bayou toward Crown Point.
LA 301 is an undivided two-lane highway for its entire length. It is classified as a rural local road by the Louisiana Department of Transportation and Development. The average daily traffic in 2013 was reported as 560 vehicles.
In the pre-1955 state highway system, LA 301 made up the northern portion of State Route 1307. This route continued southward by ferry across Bayou Villars and followed the present LA 3257 to Bayou Rigolettes opposite the small community of Lafitte. In 1948, the ferry service was replaced by the present bridge across Bayou Barataria on nearby LA 302. This effectively severed the two portions of Route 1307 as the bridge provided access to the lower portion of the route from a different location. The entirety of Route 1307 became LA 301 in the 1955 Louisiana Highway renumbering. In the early 1990s, La DOTD renumbered disconnected portions of several state highway routes, and the southern portion of LA 301 was designated as LA 3257. While LA 301 has been truncated on one end, it has been slightly lengthened on the other end, taking over about of LA 45 when the original swing bridge across Bayou Barataria on that route was replaced in 1976 by the current high-level bridge just upstream.
As of 2011, the entire route of LA 301 is proposed for deletion as it does not meet a significant interurban travel function as determined by La DOTD's Road Transfer Program.

Louisiana Highway 302

Louisiana Highway 302 runs in an east–west direction along Fisherman Boulevard from LA 3257 in Barataria to LA 45 in the town of Jean Lafitte, Jefferson Parish.
LA 302 connects the two highways by way of a swing bridge over Bayou Barataria built in 1948. It is an undivided two-lane highway for its entire length and is classified as a rural local road by the Louisiana Department of Transportation and Development. The average daily traffic in 2013 was reported as 810 vehicles.
In the pre-1955 state highway system, LA 302 was designated as State Route C-2060. LA 302 was created in the 1955 Louisiana Highway renumbering, and its route has remained the same to the present day.

Louisiana Highway 303

Louisiana Highway 303 runs in an east–west direction along Jean Lafitte Boulevard from LA 45/LA 3134 to a dead end near the Vendome Canal in Jean Lafitte, Jefferson Parish.
LA 303 continues the route of LA 45 eastward along Bayou Barataria, part of the Gulf Intracoastal Waterway, from a T-intersection where the latter turns onto a ramp leading to a high-level bridge over the bayou. LA 45 shares the bridge with LA 3134, the main route to the New Orleans metropolitan area. LA 303 is an undivided two-lane highway for its entire length. It is classified as a rural minor collector by the Louisiana Department of Transportation and Development. The average daily traffic in 2013 was reported as 560 vehicles.
In the pre-1955 state highway system, LA 303 was designated as State Route 1235. LA 303 was created in the 1955 Louisiana Highway renumbering, extending west of its present terminus to the location of the original LA 45 bascule bridge crossing. LA 303 was shortened when LA 45 was re-routed over the current bridge, which was constructed as part of the never-completed Lafitte-Larose Highway in 1976.
As of 2011, the entire route of LA 303 is proposed for deletion as it does not meet a significant interurban travel function as determined by La DOTD's Road Transfer Program.

Louisiana Highway 304

Louisiana Highway 304 runs in a general north–south direction from LA 308 in Laurel Grove to LA 20 in Chackbay, Lafourche Parish.
From the south, LA 304 begins at an intersection with LA 308, which follows the east bank of Bayou Lafourche. It proceeds northeast through rural farmland in an area west of Thibodaux known as Laurel Grove. After about, the route curves more to the east and traverses an area of light suburban development until it reaches its northern terminus at a junction with LA 20 in the small community of Chackbay.
LA 304 is an undivided two-lane highway for its entire length. The majority of the route is classified as a rural minor collector by the Louisiana Department of Transportation and Development. The average daily traffic in 2013 was reported as 1,490 vehicles.
In the pre-1955 state highway system, LA 304 was designated as State Route 486. LA 304 was created in the 1955 Louisiana Highway renumbering, and its route has remained the same to the present day.
As of 2012, the entire route of LA 304 is proposed for deletion as it does not meet a significant interurban travel function as determined by La DOTD's Road Transfer Program.

Louisiana Highway 306

Louisiana Highway 306 runs in a general north–south direction along Bayou Gauche Road from a dead end in Bayou Gauche to LA 631 in Paradis, St. Charles Parish. The route connects the small community of Bayou Gauche to US 90, the area's main highway.
From the south, LA 306 begins at a small public boat launch and proceeds south a short distance. It then turns sharply to the northwest and travels alongside Bayou Gauche, passing a series of fishing camps and boat houses. After, LA 306 curves to the north to follow a drainage canal and passes alongside a suburban neighborhood. It then intersects LA 632, which heads west toward nearby Des Allemands. The two highways run concurrently for a short distance until LA 632 turns east onto Grand Bayou Road. LA 306 continues northward through a largely uninhabited area before intersecting US 90 in the small community of Paradis. LA 306 proceeds northwest for three blocks and terminates at LA 631.
LA 306 is an undivided two-lane highway for its entire length. The majority of the route is classified as a rural minor collector by the Louisiana Department of Transportation and Development with the average daily traffic reported as 3,700 vehicles in 2013.
In the pre-1955 state highway system, LA 306 was designated as State Route 669. LA 306 was created in the 1955 Louisiana Highway renumbering, and its route has remained the same to the present day apart from the smoothing of a sharp curve west of the Grand Bayou Canal bridge. The original alignment followed what is now a local road known as Badeaux Lane.
As of 2011, the entire route of LA 306 is proposed for deletion as it does not meet a significant interurban travel function as determined by La DOTD's Road Transfer Program.

Louisiana Highway 307

Louisiana Highway 307 runs in a southeast to northwest direction from LA 20 east of Chackbay to LA 182 in Raceland, Lafourche Parish. The route traverses the small neighboring communities of Kraemer and Bayou Boeuf.
From the southeast, LA 307 begins at an intersection with LA 182 less than from its junction with US 90 in the far northeast corner of Raceland. The highway winds northward through largely uninhabited swampland, flanked initially by a narrow strip of farmland. After, LA 307 curves to the west and crosses a vertical lift bridge over Bayou Boeuf just south of Lac des Allemands. It then proceeds through the communities of Bayou Boeuf and Kraemer, the houses of which line the narrow strip of dry land traversed by the highway. Exiting Kraemer, LA 307 curves to the northwest and soon terminates at an intersection with LA 20 east of Chackbay. LA 20 connects with Vacherie to the north and Thibodaux to the southwest.
LA 307 is an undivided two-lane highway for its entire length. It is classified as a rural minor collector by the Louisiana Department of Transportation and Development. The average daily traffic in 2013 was reported as 3,100 vehicles through the populated section between LA 20 and Bayou Boeuf, reduced to 960 vehicles south of the bayou.
In the pre-1955 state highway system, LA 307 was designated as State Route 486 and included only the section of the present route between LA 20 and Bayou Boeuf. This became LA 307 in the 1955 Louisiana Highway renumbering. Around 1964, the first bridge across Bayou Boeuf was constructed, linking the highway with a local road on the opposite side that was then taken in by the state highway system as an extension of LA 307. The bridge across Bayou Boeuf was replaced with the current span in 1976.
As of 2011, the entire route of LA 307 is proposed for deletion as it does not meet a significant interurban travel function as determined by La DOTD's Road Transfer Program.