Thompson River
Thompson Fork Grand River
Location
CountryUnited States
StateIowa, Missouri
Physical characteristics
SourceNear Greenfield
 • locationAdair County, Iowa
 • coordinates41°21′24″N 94°25′52″W / 41.35667°N 94.43111°W / 41.35667; -94.43111[1]
 • elevation1,360 ft (410 m)
MouthGrand River
 • location
Livingston County, Missouri
 • coordinates
39°45′50″N 93°36′52″W / 39.76389°N 93.61444°W / 39.76389; -93.61444[1]
 • elevation
679 ft (207 m)
Length188 mi (303 km)
Basin size1,850 sq mi (4,800 km2)
Discharge 
 • locationTrenton, 25.2 miles (40.6 km) from the mouth[2]
 • average1,059 cu ft/s (30.0 m3/s)[3]
 • minimum1 cu ft/s (0.028 m3/s)
 • maximum95,000 cu ft/s (2,700 m3/s)
Basin features
Tributaries 
 • leftWeldon River, Honey Creek
 • rightSugar Creek, Hickory Creek

The Thompson River is the largest tributary of the Grand River in the central United States, flowing from southern Iowa into Missouri. In Iowa, it is known simply as the Grand River and passes near the city of Grand River.[4] The river is 188 miles (303 km) long,[5] and its drainage basin is roughly 1,850 square miles (4,800 km2), of which 1,111 square miles (2,880 km2) are in Missouri.[6]

It rises in the agricultural lands of Adair County, Iowa, a few miles northeast of Greenfield. The river initially flows east then bends south, passing Macksburg and Davis City and crossing Interstate 35. It then flows into Missouri, where much of its course is channelized. The Weldon River joins at the town of Trenton, the largest settlement along the Thompson River. Below Trenton, the Thompson meanders south for another 25 miles (40 km), joining the Grand River just north of Utica in Livingston County.[7]

See also

References

  1. 1 2 "Thompson River". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. 1980-10-24. Retrieved 2011-03-29.
  2. ↑ "USGS Gage #06899500 on the Thompson River at Trenton, MO" (PDF). National Water Information System. U.S. Geological Survey. Retrieved 2011-03-29.
  3. ↑ "USGS Gage #06899500 on the Thompson River at Trenton, MO" (PDF). National Water Information System. U.S. Geological Survey. Retrieved 2011-03-29.
  4. ↑ State Transportation Map (PDF) (Map). Iowa DOT. 2017. Retrieved 2018-04-28.
  5. ↑ U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map, accessed May 26, 2011
  6. ↑ "Thompson River Basin". Missouri Watershed Information Network. Retrieved 2011-03-29.
  7. ↑ USGS Topo Maps for United States (Map). Cartography by United States Geological Survey. ACME Mapper. Retrieved 2011-03-29.



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