The Mad River Watershed, also known as HUC 18010102, is located in Northern California and covers an area of approximately 1,170 square miles. The watershed is predominantly forested, with redwood trees covering the upper portions of the watershed. It is home to several threatened and endangered species such as salmon and steelhead trout. The watershed is characterized by a Mediterranean climate, with most precipitation occurring during the winter months. Snowpack in the watershed is an important source of water for downstream use, with the highest snow accumulation typically occurring in January and February. The watershed is also home to several reservoirs, including Ruth Lake and Blue Lake, which provide water for domestic and agricultural use. Recent trends show that the Mad River Watershed has experienced a decline in snowpack and an increase in winter temperatures, potentially impacting water availability and ecosystem health.