Rivers are a defining feature of Louisiana, shaping its landscape, culture, and economy. This article surveys the state's principal waterways and the many smaller streams and bayous that drain into the Gulf of Mexico. For a wider context on fluvial systems see general resources about rivers.

Geography and characteristics

Louisiana's river network includes large alluvial rivers, tidal estuaries, and slow-moving bayous. Many rivers carry sediment from upriver states and deposit it in coastal wetlands, creating deltas and swamps. The state’s low gradient and coastal setting produce extensive floodplains and meandering channels; in some places local names such as "bayou" or "bayou teche" denote slow, marsh-lined waterways rather than steep, fast streams.

Notable rivers

  • Mississippi River — The major continental artery that forms part of eastern Louisiana's border and has large levee systems and control works.
  • Red River — A major tributary with historical and commercial importance in northwest and central Louisiana.
  • Atchafalaya River — A distributary of the Mississippi that carries much sediment to the Gulf and supports a broad swamp and estuarine system.
  • Ouachita and Black Rivers — Important in the northeast, feeding inland wetlands and reservoirs.
  • Pearl, Calcasieu, Sabine — Coastal and border rivers with shipping, fishing, and industrial uses.
  • Bayous (e.g., Bayou Teche) — Local, slow channels central to regional ecology and culture.

History and human modification: Over centuries the state's waterways have been altered by navigation improvements, levees, channelization, and structures designed to control floods and direct sediment. Projects such as spillways and control structures influence where water and silt are delivered, affecting delta growth and coastal stability.

Uses and ecological importance: Rivers in Louisiana support shipping, fisheries, agriculture, recreation, and biodiversity. Their wetlands filter water, buffer storms, and provide habitat for migratory birds, fish, and unique swamp species. Balancing navigation, flood protection, and ecosystem restoration is a continuing management challenge.

Distinctions and notable facts: Many Louisiana waterways share names with bayous and lakes; local terminology and cultural history (French, Spanish, Indigenous, and English influences) are reflected in river names. Conservation and restoration efforts focus on reconnecting rivers to their floodplains and sustaining coastal wetlands in the face of subsidence and sea-level rise.