The Shell Rock River is a tributary of the Cedar River located in northeastern Iowa, USA. It flows through several counties, including Butler and Franklin, and is approximately 50 miles long. The river is known for its scenic beauty and recreational opportunities, such as fishing and kayaking. The river's watershed supports diverse wildlife and plant species, contributing to the local ecosystem. The Shell Rock River also plays a role in agriculture, providing water for irrigation in the surrounding farmland. Its banks are lined with trees and vegetation, making it a popular spot for nature enthusiasts and outdoor activities.