Thornapple River
| Thornapple River | |
|---|---|
Enhanced USGS Satellite Image, Thornapple River drainage basin. | |
| Native name |
|
| Location | |
| Country | United States |
| State | Michigan |
| Counties | Drainage basin covers portions of Barry, Eaton, Ionia, and Kent Counties in Central Michigan |
| Physical characteristics | |
| Source | |
| • location | S of Boody Lake, Eaton Township, Eaton County, Michigan |
| Mouth | |
• location | Grand River, Ada Township, Kent County, Michigan |
• elevation | 617 ft (188 m) |
| Length | 88 mi (142 km) |
| Discharge | |
| • location | mouth |
| • average | 838.49 cu ft/s (23.743 m3/s) (estimate) |
The Thornapple River (Ottawa: Sowanquesake, "Forked River") (GNIS ID #1075813) is an 88.1-mile-long (141.8 km) tributary of Michigan's longest river, the Grand River. The Thornapple rises in Eaton County, Michigan and drains a primarily rural farming area in Central Michigan. It joins the Grand in Ada, Michigan, 10 miles (16 km) east of Grand Rapids.