Why the Mississippi River Can't Take Its Shortcut

The Mississippi River stays on its current route to the Gulf because of Old River control, dredging and bank protection. Over a year, about 70% of combined Mississippi and Red River flow stays in the Mississippi route and about 30% takes the Atchafalaya route. The Mississippi River connects a huge drainage basin to a working shipping corridor. Its modern course depends on dredging, bank protection and the control structures at Old River. This countdown follows those connections from the wider basin to Louisiana's coast. It explains why the Atchafalaya offers a different downstream route, how the combined Mississippi and Red River flow is allocated over a year, and why that allocation does not describe every day's operation or the distribution of sediment. Morganza and Bonnet Carré provide separate flood routes. The 1973 damage at Old River and the 2011 flood imagery show why each structure needs its own explanation. The episode then examines the low-water and saltwater problems of 2023, the long decline in sediment supply, and the sediment that helped build the Wax Lake delta. Dated satellite images and agency photographs keep historical events distinct from present-day geographic context. Water routing, navigation and land-building share one river system, while each presents a different management problem. Chapters 0:00 A river that needs help to stay put 0:42 The basin and the shipping channel 4:23 Old River and the two downstream routes 9:28 Morganza and Bonnet Carré 11:48 Low water, saltwater and less sediment 16:00 How Wax Lake built land Sources [S1] National Park Service (n.d.). https://www.nps.gov/miss/riverfacts.htm [S2] U.S. Geological Survey (1995). https://pubs.usgs.gov/circ/circ1133/g... [S3] NASA Earth Observatory (2011). https://earthobservatory.nasa.gov/blo... [S4] NASA Earth Observatory (2011). https://science.nasa.gov/earth/earth-... [S5] U.S. Geological Survey (n.d.). https://eros.usgs.gov/earthshots/old-... [S6] U.S. Army Corps of Engineers (2025). https://www.hec.usace.army.mil/sustai... [S7] National Park Service (n.d.). https://www.nps.gov/locations/lowerms... [S8] Institute for Water Resources (2014). https://www.govinfo.gov/content/pkg/G... [S9] NASA Earth Observatory (2011). https://science.nasa.gov/earth/earth-... [S10] NASA Earth Observatory (2011). https://science.nasa.gov/earth/earth-... [S11] NASA Earth Observatory (n.d.). https://www.earthobservatory.nasa.gov... [S13] U.S. Geological Survey (n.d.). https://eros.usgs.gov/earthshots/atch... [S14] NASA Earth Observatory (n.d.). https://science.nasa.gov/earth/earth-... [S15] U.S. Geological Survey (n.d.). https://eros.usgs.gov/earthshots/atch... [S16] U.S. Geological Survey (2012). https://www.usgs.gov/publications/a-b... [S17] U.S. Geological Survey (2018). https://www.usgs.gov/publications/sus... [S19] National Oceanic and Atmospheric Administration (2023). https://www.noaa.gov/news/mississippi... [S20] NOAA Central Region Collaboration Team (2024). https://www.noaa.gov/sites/default/fi... Credits Maps: U.S. Census Bureau · USGS National Hydrography Dataset · USGS Watershed Boundary Dataset · USGS 3DEP Footage and photos: U.S. Army Corps of Engineers · USGS · NASA · 70th Mobile Public Affairs Detachment / Joshua Breig · U.S. Coast Guard · Flickr · USDA · NOAA (every creator by name, with links: the credits comment under the pinned comment) Licences: CC BY-SA 2.0 https://creativecommons.org/licenses/... · CC BY 2.0 https://creativecommons.org/licenses/... CC BY excerpts edited: audio removed, resized and annotated; some slowed. Adapted Tobin/Flickr photographs remain licensed CC BY-SA 2.0 https://creativecommons.org/licenses/... ; changes: crop, resize and motion. Original links and attribution appear in the credits comments. The appearance of U.S. Department of War (DoW) visual information does not imply or constitute DoW endorsement. #geography #usgeography #mississippiriver