Thompson River (Missouri) facts for kids
Quick facts for kids Thompson River |
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| 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) 41°21′24″N 94°25′52″W / 41.35667°N 94.43111°W |
| River mouth | Grand River Livingston County, Missouri 679 ft (207 m) 39°45′50″N 93°36′52″W / 39.76389°N 93.61444°W |
| Length | 188 mi (303 km) |
| Basin features | |
| Basin size | 1,850 sq mi (4,800 km2) |
| Tributaries |
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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.
