We have selected United States Geological Survey as the world's very best website on the Mississippi River.
The United States Geological Survey (USGS) is part of the US Department of the Interior. It is a multi-disciplinary science organization that focuses on biology, geography, geology, geospatial information, and water. It studies the landscape and natural resources, and addresses natural hazards.
The USGS website contains a substantial illustrated section on the Mississippi River. This covers: Definitions and General Information on Mississippi River Reaches, Geography Geologica History & Human Development in the Mississippi River basin, Degradation of the Mississippi Delta and Coastal Wetlands, Status & Trends of Plants & Animals, Gaps in Knowledge, and Ecosystem Status & Health. The section on Plants and Animals in the Mississippi River basic covers: Floodplain Forest, Dominant Tree Species, Floods & Forests, Aquatic Vegetation, Effects of Impoundment, Bottom-Dwelling Invertebrates, Fishes, Birds, Raptors, Songbirds, Resident Birds, Mammals, Mink, and Muskrat.