The Tomorrow/Waupaca River is a river that flows wholly within the U.S. state of Wisconsin. It is called the Tomorrow River where it rises between Polonia and Rosholt in northeast Portage County; it flows through Nelsonville and Amherst. As it exits the village of Amherst, the Tomorrow enters the Town of Amherst, where it joins Bear Creek to become the Waupaca River.[1] It flows into Waupaca County and through the city of Waupaca. There it adjoins the Crystal River and enters Weyauwega before converging 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.[2]