The Donner und Blitzen Watershed (HUC 17120003) covers a land area of approximately 2,174 square miles in southeastern Oregon. The hydrology of the watershed is primarily influenced by the Malheur River and its tributaries, which provide surface water to the area. The snowpack in the watershed is typically shallow, with peak snow accumulation occurring in February. Surface water quality in the area is generally good, with low levels of pollutants and high levels of dissolved oxygen. The main reservoir in this watershed is the Owyhee Reservoir, which is used for irrigation and recreation purposes. Interesting climatic facts include the region's high desert climate, with hot summers and cold winters, and occasional thunderstorms during the summer months. Climate data shows a long-term trend of increasing temperatures and decreasing precipitation in the region.