The Lower Columbia Clatskanie Watershed (HUC 17080003) covers approximately 2,676 square miles in northwest Oregon and southwest Washington. The watershed is primarily characterized by forested areas, agricultural land, and wetlands. The hydrology of the watershed is influenced by the Columbia River and its tributaries. The snowpack in the area varies depending on elevation, with higher elevations receiving more snow. Surface water in the watershed is used for irrigation, industrial use, and municipal water supply. The reservoirs in the area are used primarily for hydroelectric power production. Interesting climatic facts include high annual precipitation levels, with an average of around 80 inches per year, and relatively mild temperatures throughout the year. Climate trends in the area include an increase in average temperatures and changes in precipitation patterns, which may have implications for water availability and ecosystem health in the watershed.