Ojibwe’s Great River still splits American call letters
The Mississippi drains the United States’ largest basin and ranks second in U.S. length after the Missouri. From Lake Itasca in northern Minnesota it runs about 2,340 miles (3,766 kilometres) to the Gulf of Mexico, touching all or part of thirty-two states and two Canadian provinces.
French Misi zipi renders Anishinaabe Misi-ziibi—“Great River.” Upper, Middle, and Lower reaches divide at the Missouri and Ohio confluences. The Upper stretch alone holds forty-three dams between Itasca and St. Louis; twenty-nine lock-and-dam structures from Minneapolis south made commercial navigation possible until the St. Anthony Falls locks closed in 2015 against invasive Asian carp, returning Minneapolis to head-of-navigation status.
Lake Itasca sits 1,475 feet above sea level; its coined name blends Latin veritas and caput for “true head.” The Upper St. Anthony Falls lock drops forty-nine feet—the largest single Mississippi lock fall—from 799 to 750 feet elevation. Silt built the fertile Mississippi embayment and American Bottom; nineteenth-century steamboats hauled farm and factory cargo, and Union control of the river during the Civil War became a strategic hinge. The same falls are the only genuine waterfall anywhere on the river. Upstream, Lake Winnibigoshish near Grand Rapids stretches more than 11 miles across, the widest point on the whole channel.
The 1783 Treaty of Paris largely set the river as the young United States’ western edge; after the Louisiana Purchase it became a cultural meridian—Gateway Arch symbolism, “east/west of the Mississippi” boasts, and FCC call signs W east versus K west. Agricultural runoff still feeds the Gulf dead zone.
Hydrologically, the story has a twist. Where the Ohio meets it at Cairo, Illinois, the Ohio carries about 281,500 cubic feet per second against the Mississippi's 208,200, so by volume the Ohio is arguably the main stem. Farther south, engineers at the Old River Control Structure deliberately send about 30 percent of the combined Mississippi and Red flow down the Atchafalaya, largely to stop the main river from abandoning New Orleans for that shorter route. The whole catchment, the world's fourth largest, covers nearly 40 percent of the continental United States and reaches up to Mount Elbert at 14,440 feet.
Source: Mississippi River
