The Thornapple River (Ottawa: Sowanquesake, "Forked River") 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.
The Thornapple, a major Grand River tributary, is about 88 miles (142 km) long. Its headwaters are located about 7 miles (11 km) east of Charlotte, Michigan in Eaton County's Eaton township (only 7 miles (11 km) west of the Grand River at Eaton Rapids). It flows generally west and north through Eaton and Barry counties, before entering the Grand in Kent County. The Grand ultimately flows into Lake Michigan at Grand Haven, approximately 70 miles (110 km) down stream. The Thornapple is described as "An easygoing stream that meanders through low southwest Michigan woodlands." The Thornapple itself has a major tributary in the Coldwater River. The Thornapple is the only major left tributary of the Grand River.
This cache is located just off one of the many trails located in Sleepy Hollow State Park and was placed for the 4th Annual Camp MiGO event. Most of the trails are well groomed and hard packed making a bike a great way to get to the caches in the area. Keep in mind during hunting season to be aware of hunters in the area. Hunting is allowed from September 15 until April 1st each year, so please be careful and dress appropriately when hunting is allowed.
A Recreation Passport is required for all vehicles entering Sleepy Hollow State Park. They are available for $16.00 at the park. Camping is available for the event at: www.midnrreservations.com. The park closes to visitors at 10PM.