Blue Earth River
The Blue Earth River is a tributary of the Minnesota River. It is 108 miles (174 km) long and can be found in the southern part of Minnesota and the northern part of Iowa in the United States. It has two headwaters: the Middle Branch Blue Earth River and the West Branch Blue Earth River. The Blue Earth River is part of the watershed of the Mississippi River. The river was named for old of bluish-green clay that could be seen along the banks of the river. However, you are no longer able to see these deposits. It was called Makato Osa Watapa by the Dakota Indians. This had the meaning "the river where blue earth is gathered." 
|Blue Earth River|
The Blue Earth River as viewed from Rapidan Dam in Blue Earth County in 2007
|- left||Watonwan River|
|- right||East Branch Blue Earth River, Le Sueur River|
|Source||Middle Branch Blue Earth River|
|- location||near Rake, Winnebago County, Iowa|
|- elevation||1,207 ft (368 m) |
|Secondary source||West Branch Blue Earth River|
|- location||near Swea City, Kossuth County, Iowa|
|- elevation||1,152 ft (351 m) |
|- location||Elmore Township, Faribault County, Minnesota|
|- elevation||1,076 ft (328 m) |
|- location||Mankato, Blue Earth County, Minnesota|
|- elevation||765 ft (233 m) |
|Length||108 mi (174 km) |
|Basin||3,486 sq mi (9,029 km²) |
|Discharge||for Rapidan Township, Minnesota|
|- average||1,076 cu ft/s (30 m³/s) |
|- max||43,100 cu ft/s (1,220 m³/s)|
|- min||6.9 cu ft/s (0 m³/s)|
- Google Earth elevation for GNIS coordinates. Retrieved on 2007-06-09.
- "Geographic Names Information System entry for Middle Branch Blue Earth River (Feature ID #459026)". Geographic Names Information System. Retrieved 2007-06-09.
- "Geographic Names Information System entry for West Branch Blue Earth River (Feature ID #653931)". Geographic Names Information System. Retrieved 2007-06-09.
- "Geographic Names Information System entry for Blue Earth River (Feature ID #640285)". Geographic Names Information System. Retrieved 2007-06-09.
- "National Assessment Database: Assessment Data for the State of Minnesota Year 2004". United States Environmental Protection Agency. pp. Blue Earth Watershed. Retrieved 2007-06-09.
- "Watersheds of the Minnesota River Basin". Minnesota Pollution Control Agency. 2005-12-01. pp. Minnesota River Basin: Blue Earth, Watonwan, and Le Sueur River Watersheds. Retrieved 2007-06-09.
- Mitton, G.B.; K.G. Guttormson, G.W. Stratton and E.S. Wakeman. "Water Resources Data in Minnesota, Water Year 2005 Annual Report". United States Geological Survey. pdf: Blue Earth River near Rapidan, MN. Retrieved 2007-06-09.
- Upham, Warren (2001). Minnesota Place Names, A Geographical Encyclopedia, 3rd Edition. Saint Paul, Minnesota: Minnesota Historical Society. p. 65. ISBN 0-87351-396-7.