The Crawfish River is a tributary of the Rock River located in southern Wisconsin, USA. It flows through several counties, including Dodge and Jefferson, and is approximately 40 miles long. The river is known for its scenic beauty and is a popular spot for outdoor activities such as fishing, kayaking, and hiking along its banks. The Crawfish River is part of the Mississippi River watershed, contributing to the larger ecosystem in the region. Its waters support various wildlife and plant species, making it an important habitat. The river also plays a role in local agriculture and water management efforts.