2020 Map of Grand River

About this map

The Atchafalaya Basin Floodway dominates this landscape, defining a complex network of waterways where Iberville Parish and ST Martin Parish meet. The Grand River and Upper Grand River serve as central arteries for this wetland environment, which is intricately carved by numerous distributaries including Bayou Pigeon, Bayou Maringouin, and Bayou Sorrel. The lack of dense road infrastructure, save for the presence of Bayou Sorrell Rd, highlights the region's historical reliance on water-based travel and its role as a massive natural spillway. Interior water bodies like Pigeon Bay, Spike Bay, and Frog Lake dot the swampy terrain, illustrating the hydrologic complexity of the basin. The map preserves the exact boundaries and drainage patterns of these bayous and coves, such as Sawyers Cove and Tarleton Bayou, providing an essential reference for understanding the geography of southern Louisiana's river country.