Bayous lace this portion of south Louisiana. The highest land in the area is located along the banks of Bayou Lafourche, where elevation of natural levees ranges from 15 to 20 feet above sea level. The community of Pierre Part, located along a body of water known as Pierre Part Bay (which flows into Lake Verret), sits on land only 3 feet above sea level and is nearly surrounded by water. It was inaccessible by land until the mid-20th century, thus isolated from much of the world. Residents here and throughout south Louisiana adapted to a semi-aquatic way of life by using a variety of pirogues, boats and, eventually, bridges to get around. The pontoon bridge that stretches across Belle River about 4.5 miles south of here, for example, is a floating barge connected by a pivot arm to a fixed point along the shoreline. A mechanical system swings the bridge to the riverbank when the channel is open to boat traffic.