| Upper Mississippi River | |
|---|---|
 The Upper Mississippi River near Harpers Ferry, Iowa | |
| Location | |
| Country | US, Canada [1] |
| Physical characteristics | |
| Source | |
| • location | Lake Itasca, Minnesota[1] |
| • coordinates | 47°15′11″N 95°12′43″W / 47.253°N 95.212°W |
| • elevation | 450 m (1,480 ft)[2] |
| Mouth | |
• location | St. Louis, Missouri (flows into the Middle Mississippi) [1] |
| Length | 1,300 miles (2092.147 km) [3] |
| Basin size | 490,000 km2 (190,000 sq mi)[4] |
| Discharge | |
| • average | 5,796 m3/s (204,700 cu ft/s)[5] |
The Upper Mississippi River is today the portion of the Mississippi River upstream of St. Louis, Missouri, United States,[1] 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.
- ^ a b c d "Mississippi River | History, Physical Features, Culture, & Facts". Encyclopedia Britannica. Retrieved 2020-06-03.
- ^ "General Information about the Mississippi River". U.S. National Park Service. Retrieved 2006-04-01.
- ^ "UMESC - About the Upper Mississippi River System". www.umesc.usgs.gov. Retrieved 4 June 2020.
- ^ "River and Basin Facts". Upper Mississippi River Basin Association. Retrieved 2009-04-07.
- ^ "Background on Upper Mississippi River Basin". EPA: Mississippi River Basin & Gulf of Mexico Hypoxia. Retrieved 2006-04-01.