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Thompson River (Missouri) facts for kids

Kids Encyclopedia Facts
For rivers with similar names, see Thompson River (disambiguation).
Quick facts for kids
Thompson River
Other name(s) Thompson Fork Grand River
Country United States
State Iowa, Missouri
Physical characteristics
Main source Near Greenfield
Adair County, Iowa
1,360 ft (410 m)
River mouth Grand River
Livingston County, Missouri
679 ft (207 m)
Length 188 mi (303 km)
  • Location:
    Trenton, 25.2 miles (40.6 km) from the mouth
  • Minimum rate:
    1 cu ft/s (0.028 m3/s)
  • Average rate:
    1,059 cu ft/s (30.0 m3/s)
  • Maximum rate:
    95,000 cu ft/s (2,700 m3/s)
Basin features
Basin size 1,850 sq mi (4,800 km2)
  • Left:
    Weldon River, Honey Creek
  • Right:
    Sugar 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. The river is 188 miles (303 km) long, 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.

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.

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