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Along the river's upper course shipping is interrupted by ice from December to March; thick, hazardous fogs frequently settle on the cold waters of the unfrozen sections during warm spells from December to May. In its upper course the river is controlled by numerous dams and falls c.700 ft (210 m) in the 513-mi (826-km) stretch from Lake Itasca to Minneapolis and then falls c.490 ft (150 m) in 856 mi (1,378 km) from Minneapolis to Cairo, Ill. The Mississippi River receives the Missouri River 17 mi (27 km) N of St. Louis and expands to a width of c.3,500 ft (1,070 m); it swells to c.4,500 ft (1,370 m) at Cairo, where it receives the Ohio River. The upper Mississippi is divided into three sections: the headwaters, from the source to Saint Anthony Falls, a series of man-made lakes between Minneapolis and St. Louis, Missouri, and the middle Mississippi, a relatively free-flowing river downstream of the confluence with the Missouri River at St. Louis.

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Q: What is the upper course of the Mississippi river like?
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How are interlocking spurs formed?

An interlocking spur is a natural feature which occurs in a river's upper course, where upward erosion is the dominant force in determining the river's course. As the river wanders between banks that are far apart, the promontories of the hills tend to jut out into the river valley in a staggered formation, interlocked together in a formation like the teeth of a zip. These promontories are referred to as interlocking spurs. While similar in general appearance, the mechanism behind the formation of interlocking spurs is different to that behind meandering and they should not be confused. If the valley experiences glaciation, the interlocking spurs are foreshortened as the tips are sheared off. These are referred to as truncated spurs. by naseem kaid or messi


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