The Tomorrow/Waupaca River is a river in the U.S. state of Wisconsin.
It originates as the Tomorrow River between Polonia and Rosholt in northeast Portage County, then flows through Nelsonville, Wisconsin and Amherst, Wisconsin. As it exits the village of Amherst, it enters the town of Amherst where it then joins Bear Creek. This marks the point where its name changes to the Waupaca River. It then flows into Waupaca County and the city of Waupaca, Wisconsin, where it adjoins the Crystal River and enters Weyauwega before it converges with the Wolf River in eastern Waupaca County.
The Waupaca River is 44.8 miles (72.1 km) long, and the Tomorrow River is 22.1 miles (35.6 km) long.[1]
The river was named the Waupaca River by the Native Americans inhabiting the area, Waupaca being the Native American word for "tomorrow". It was so named because it took the Native Americans 24 hours to travel its full length and they would not reach the end until the following day. It is unknown why the name was changed to the Tomorrow River before it reaches Bear Creek. The Wisconsin Department of Natural Resources recognizes the river as the "Tomorrow/Waupaca River".