The Tualatin watershed (huc 17090010) is located in northwest Oregon and covers approximately 712 square miles of land area. Hydrologically, the watershed is characterized by small tributaries that feed into the Tualatin River, which flows into the Willamette River. Snowpack in the watershed varies depending on elevation, with higher elevations typically experiencing more consistent snow accumulation. Surface water in the watershed is primarily used for municipal and agricultural purposes, with the Tualatin River serving as a water source for the Portland metro area. Reservoir constituents in the watershed include Hagg Lake, which provides drinking water and recreational opportunities. Interesting climatic facts include the fact that the Tualatin watershed experiences a Mediterranean climate with mild, wet winters and dry summers. In recent years, the watershed has seen increased instances of drought and wildfires, likely due to climate change.