Thompson River (Missouri)

Thompson River
Thompson Fork Grand River
River
Country United States
States Iowa, Missouri
Tributaries
 - left Weldon River, Honey Creek
Source Near Greenfield
 - location Adair County, Iowa
 - elevation 1,360 ft (415 m)
 - coordinates 41°21′24″N 94°25′52″W / 41.35667°N 94.43111°W / 41.35667; -94.43111 [1]
Mouth Grand River
 - location Livingston County, Missouri
 - elevation 679 ft (207 m)
 - coordinates 39°45′50″N 93°36′52″W / 39.76389°N 93.61444°W / 39.76389; -93.61444Coordinates: 39°45′50″N 93°36′52″W / 39.76389°N 93.61444°W / 39.76389; -93.61444 [1]
Length 188 mi (303 km)
Basin 1,850 sq mi (4,791 km2)
Discharge for Trenton, 25.2 miles (40.6 km) from the mouth
 - average 1,059 cu ft/s (30 m3/s) [2]
 - max 95,000 cu ft/s (2,690 m3/s)
 - min 1 cu ft/s (0 m3/s)

The Thompson River is the largest tributary of the Grand River in the central United States, flowing from southern Iowa into Missouri. The river is 188 miles (303 km) long,[3] 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.[4]

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.[5]

See also

References

  1. 1 2 "Thompson River". Geographic Names Information System. United States Geological Survey. 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. ↑ U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map, accessed May 26, 2011
  4. ↑ "Thompson River Basin". Missouri Watershed Information Network. Retrieved 2011-03-29.
  5. ↑ USGS Topo Maps for United States (Map). Cartography by United States Geological Survey. ACME Mapper. Retrieved 2011-03-29.
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