The route initially heads south from Maringouin alongside the bayou of the same name before turning east through the village of Rosedale. This portion of LA 76 makes a loop off of LA 77 and connects the two communities to Interstate 10 (I-10) via LA 3000 at Ramah. East of Rosedale, LA 76 crosses from Iberville Parish into West Baton Rouge Parish and parallels I-10 into Port Allen, the parish seat. The east–west portion of LA 76 is also signed as an Incident Alternate Route of I-10.