The Lower Eel watershed (HUC 18010105) spans approximately 1,538 square miles in Northern California. It is characterized by a diverse hydrological network consisting of the Eel River, Van Duzen River, and numerous smaller tributaries. The region experiences a Mediterranean climate with dry summers and wet winters. Snowpack in the area is critical for water supply during the dry season, but there has been a decreasing trend in snow accumulation in recent years due to climate change. The Lower Eel watershed is home to several large reservoirs, including Lake Pillsbury and the Potter Valley Project, which provide hydroelectric power and irrigation water to the surrounding communities. Agricultural activities within the watershed contribute to surface water pollution, including harmful algal blooms. Efforts are underway to address these issues through watershed management and restoration projects.