Investigating local watersheds presents middle school students with authentic opportunities to engage in inquiry and address questions about their immediate environment. Investigation activities promote learning in an investigations interdisciplinary context as students explore relationships among chemical, biological, physical, geological, and historical characteristics of the watershed. This helps them to understand changing trends in water quality, which can encourage students to formulate conclusions about the impact of land and water use and habitat issues. In addition, historical research of a watershed may help students understand changes and develop possible solutions to protect their watershed. Students can use web-based learning resources to assist them in their watershed investigations. This article describes the specific project design and provides guidelines for teachers considering conducting their own watershed investigations.