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Mississippi River, 55455-0237, United States (39.54825 -91.15363)
The uppermost lock and dam on the Upper Mississippi River is the Upper St. Anthony Falls Lock and Dam in Minneapolis. Above the dam, the river's elevation is 799 feet (244 m). Below the dam, the river's elevation is 750 feet (230 m). This 49-foot (15 m) drop is the largest of all the Mississippi River locks and dams. The origin of the dramatic drop is a waterfall preserved adjacent to the lock under an apron of concrete. Saint Anthony Falls is the only true waterfall on the entire Mississippi River. The water elevation continues to drop steeply as it passes through the gorge carved by the waterfall.
Gratiot, Saint Louis, City of Saint Louis, Missouri, 63139, United States of America (38.62227 -90.28150)
Coordinates: 38.60227 -90.30150 38.64227 -90.26150 - Minimum elevation: 426 ft - Maximum elevation: 689 ft - Average elevation: 515 ft
Gashland, Kansas City, Clay County, Missouri, 64188, United States of America (39.24635 -94.57564)
Coordinates: 39.22635 -94.59564 39.26635 -94.55564 - Minimum elevation: 833 ft - Maximum elevation: 1,093 ft - Average elevation: 981 ft
Fernridge, Creve Coeur, Saint Louis County, Missouri, 631462, United States of America (38.68089 -90.47762)
Coordinates: 38.66089 -90.49762 38.70089 -90.45762 - Minimum elevation: 423 ft - Maximum elevation: 722 ft - Average elevation: 538 ft