The total length of 451 is about 33 miles. The portion of the loop above La.1, from Hamburg to Moreauville is 31 miles. On La.1, the distance from start to finish is 1.5 miles. This area is cumulatively called Big Bend. It is noted for Civil War history, the battle of Yellow Bayou actually took place near Hamburg. It is also noted for railroad history, hosting the main north-south route which included a train ferry ride across the Atchafalaya and Mississippi Rivers. Today, it is the home of the Sarto Bridge museum. It is a MUST VISIT. The tour guide is excellent. Visit soon. The lack of visitors could close the place. It is the best 2 buck tour I've been on.