The Lower Niobrara Watershed (HUC 10150007) covers an area of approximately 6,800 square miles in northeastern Nebraska and southeastern South Dakota. The hydrology of the watershed is dominated by the Niobrara River, which extends more than 500 miles from its headwaters in Wyoming to its confluence with the Missouri River in Nebraska. The watershed receives an average of 23 inches of precipitation per year and experiences a wide range of temperatures, with average highs in the summer reaching the mid-80s and average lows in the winter dropping to the mid-teens. The watershed is also home to several reservoirs, including Lewis and Clark Lake, which provides hydroelectric power and recreational opportunities. Snowpack in the watershed varies from year to year, but typically accumulates in the winter and contributes to surface water availability in the spring and summer. Recent trends in the watershed include increased precipitation and temperature variability, which may have implications for water availability and ecosystem health.