The Coquille watershed covers an area of approximately 1,902 square miles in southwestern Oregon. The hydrology of the watershed is characterized by a mix of perennial streams and intermittent tributaries, with the Coquille River being the primary waterway. Winters in the region are typically mild, with a mean annual snowpack of around 40 inches. Surface water in the watershed is impacted by agriculture, forest harvest, and urbanization, with the resulting runoff contributing to nutrient and sediment loads in the river. Reservoirs along the Coquille River are used for irrigation, flood control, and hydroelectric power generation. Over the past few decades, the region has experienced a trend of decreasing precipitation during the summer months, with corresponding impacts on water availability for agricultural and residential use.