The route initially heads south from Maringouin alongside the bayou of the same name before turning east through the village of Rosedale.

Just northeast of Rosedale, the surroundings change abruptly from rural farmland to thickly wooded wetlands, and LA 76 crosses into West Baton Rouge Parish.

LA 76 turns east again onto Court Street just north of an interchange with I-10 and returns to its original two-lane capacity.

It generally functions as a rural minor collector along the Bayou Maringouin road, a rural major collector along Rosedale Road, an urban principal arterial along Lobdell Highway, and an urban minor arterial along Court Street.

[12][13] This portion of what is now LA 76 connected to the Baton Rouge ferry across the Mississippi River before the completion of the Huey P. Long Bridge upstream on the current alignment of US 190 in 1940.

With the 1955 renumbering, the state highway department initially categorized all routes into three classes: "A" (primary), "B" (secondary), and "C" (farm-to-market).

La DOTD is currently engaged in a program that aims to transfer about 5,000 miles (8,000 km) of state-owned roadways to local governments over the next several years.

[19] Under this plan of "right-sizing" the state highway system, the eastern portion of LA 76 along Court Street in the Port Allen area is proposed for deletion as it no longer meets a significant interurban travel function.