Blue Earth River
Blue Earth River Makhátho Wakpá, Makato Osa Watapa | |
---|---|
Etymology | English translation of the Dakota name for the river's blue-green clay |
Location | |
Country | United States |
State | Iowa, Minnesota |
Physical characteristics | |
Source | Middle Branch Blue Earth River |
• location | near Rake, Winnebago County, Iowa |
• coordinates | 43°27′30″N 93°48′04″W / 43.45833°N 93.80111°W[1] |
• elevation | 1,207 ft (368 m)[2] |
2nd source | West Branch Blue Earth River |
• location | near Swea City, Kossuth County, Iowa |
• coordinates | 43°24′13″N 94°17′38″W / 43.40361°N 94.29389°W[3] |
• elevation | 1,152 ft (351 m)[2] |
Source confluence | |
• location | Elmore Township, Faribault County, Minnesota |
• coordinates | 43°34′20″N 94°06′11″W / 43.57222°N 94.10306°W[4] |
• elevation | 1,076 ft (328 m)[2] |
Rapidan Township, Minnesota[7] | |
• average | 1,076 cu ft/s (30.5 m3/s)[8] |
• minimum | 6.9 cu ft/s (0.20 m3/s) |
• maximum | 43,100 cu ft/s (1,220 m3/s) |
Basin features | |
Tributaries | |
• left | Watonwan River |
• right | East Branch Blue Earth River, Le Sueur River |
The Blue Earth River (Dakota: Makhátho Wakpá) is a tributary of the Minnesota River, 108 miles (174 km) long, in southern Minnesota in the United States. Two of its headwaters tributaries, the Middle Branch Blue Earth River and the West Branch Blue Earth River, also flow for short distances in northern Iowa. By volume, it is the Minnesota River's largest tributary, accounting for 46% of the Minnesota's flow at the rivers' confluence in Mankato.[6] Via the Minnesota River, the Blue Earth River is part of the watershed of the Mississippi River, draining an area of 3,486 square miles (9,030 km2) in an agricultural region. Ninety percent of the river's watershed is in Minnesota.[6] It is a Minnesota Department of Natural Resources designated Water Trail.
History
The river was named for former deposits of bluish-green
Geography
The Blue Earth River begins at the confluence of its west and middle branches, approximately five miles (8.0 km) north of Elmore in southwestern Faribault County, Minnesota. The Middle Branch, 35.1 miles (56.5 km) long[12] and sometimes known as the main stem of the river,[1] rises in northwestern Winnebago County, Iowa, approximately 7 miles (11 km) east of Rake, and flows westwardly into Kossuth County, Iowa, then northwardly into Faribault County. The West Branch, 24.7 miles (39.8 km) long,[12] rises near Swea City, Iowa, in northern Kossuth County and flows northeastwardly into Faribault County. Both headwaters tributaries have been channelized for much of their courses.
From their confluence the Blue Earth River flows northwardly in a winding course through eastern Faribault County into Blue Earth County, past the cities of Blue Earth, Winnebago, and Vernon Center, to Mankato, where it enters the Minnesota River from the south.[13][14] Rapidan Dam, constructed for the purpose of hydroelectricity generation in 1910, impounds the river 12 miles (19 km) upstream from its mouth; its reservoir filled with silt and mud soon after the dam's completion. The hydroelectric facility was later decommissioned but reactivated in 1984.[7][11]
The Blue Earth River's largest tributaries are the
The Blue Earth River flows in most of its course through till plains and the plain of a former glacial lake. The drain of the glacial lake, Union Slough, drains in two directions, south into the East Fork of the Des Moines River and north, as Union Slough, into the West Branch of the Blue Earth River. The lower (northern) part of the river's watershed was historically covered by the Big Woods, a tract of hardwoods that has since been largely converted to agricultural use; segments of the woodland extended southward along the riparian corridors of the Blue Earth River and its tributaries.[6] In its lower course below Rapidan Dam, the river flows through a wooded gorge in the valley of the Minnesota River; this section is a popular canoeing route.[11]
According to the Minnesota Pollution Control Agency, approximately 84% of the Blue Earth River's watershed is used for agricultural cultivation, primarily that of
Flow rate
The
See also
- List of rivers of Minnesota
- List of rivers of Iowa
- List of Minnesota placenames of Native American origin
References
- ^ a b "Geographic Names Information System entry for Middle Branch Blue Earth River (Feature ID #459026)". Geographic Names Information System. Retrieved 2007-06-09.
- ^ GNIScoordinates. Retrieved on 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.
- ^ a b "Geographic Names Information System entry for Blue Earth River (Feature ID #640285)". Geographic Names Information System. Retrieved 2007-06-09.
- ^ a b c "National Assessment Database: Assessment Data for the State of Minnesota Year 2004". United States Environmental Protection Agency. pp. Blue Earth Watershed. Archived from the original on 2007-07-07. Retrieved 2007-06-09.
- ^ a b c d e "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. Archived from the original on 2007-02-05. Retrieved 2007-06-09.
- ^ a b c Mitton, G. B.; K. G. Guttormson; G. W. Stratton; E. S. Wakeman. "Water Resources Data in Minnesota, Water Year 2005 Annual Report". United States Geological Survey. pp. Blue Earth River near Rapidan, MN. Retrieved 2007-06-09.
- ^ Mitton, G. B.; K. G. Guttormson; G. W. Stratton; E. S. Wakeman. "Water Resources Data in Minnesota, Water Year 2005 Annual Report". United States Geological Survey. pp. Blue Earth River near Rapidan, MN. Retrieved 2007-06-09.
- ISBN 978-1953432001.
- ISBN 0-87351-396-7.
- ^ ISBN 0-8166-0960-8.
- ^ a b c d U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map Archived 2012-03-29 at the Wayback Machine, accessed October 5, 2012
- ^ ISBN 0-89933-222-6.
- ISBN 0-89933-214-5.
- ^ "Geographic Names Information System entry for East Branch Blue Earth River (Feature ID #643049)". Geographic Names Information System. Retrieved 2007-06-09.
- ^ "Geographic Names Information System entry for Elm Creek (Feature ID #643295)". Geographic Names Information System. Retrieved 2007-06-09.
- ^ Steil, Mark (2005-06-09). "Blue Earth River heavily polluted". Minnesota Public Radio. Retrieved 2007-06-09.