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The average depth of the Mississippi River between Saint Paul and Saint Louis is between 9 and 12 feet (2.7–3.7 m) deep, the deepest part being Lake Pepin, which averages 20–32 feet (6–10 m) deep and has a maximum depth of 60 feet (18 m). Between where the Missouri River joins the Mississippi at Saint Louis, Missouri, and Cairo, Illinois ...
In addition, the length of meanders can change significantly over time due to natural or artificial cutoffs, when a new channel cuts across a narrow strip of land, bypassing a large river bend. For example, due to 18 cutoffs created between 1766 and 1885, the length of the Mississippi River from Cairo, Illinois , to New Orleans, Louisiana , was ...
The river runs approximately 273 miles (439 km) long, in the U.S. state of Illinois. [12] This river was important among Native Americans and early French traders as the principal water route connecting the Great Lakes with the Mississippi. The Illinois River meets the Mississippi at Pere Marquette State Park, which is near Grafton.
Waterway Orientation Length (km) River flow at Discharge Mouth coordinates Mouth location Source coordinates Source location Apple River: Left 89
Stream gradient may change along the stream course. An average gradient can be defined, known as the relief ratio, which gives the average drop in elevation per unit length of river. [4] The calculation is the difference in elevation between the river's source and the river terminus (confluence or mouth) divided by the total length of the river ...
The United States Geological Survey (USGS) defines it as the period between October 1 of one year and September 30th of the next, [2] [3] as late September to early October is the time for many drainage areas in the US to have the lowest stream flow and consistent ground water levels. The water year is designated by the calendar year in which ...
Not to be confused with lag time. Lag time the time interval from the maximum rainfall to the peak discharge. Time to peak time interval from the start of rainfall to the peak discharge. Time of concentration Time of concentration is the time from the end of the precipitation period to the end of the quick–response runoff in the hydrograph. [3]
The Upper Mississippi River is the portion of the Mississippi River upstream of St. Louis, Missouri, United States, [1] a city at the confluence of its main tributary, the Missouri River. [ citation needed ] Historically, it may refer to the area above the Arkansas Post , above the confluence of Ohio River , or above Cape Girardeau .