The Beaver Watershed (HUC 05030104) is located in Northwest Arkansas and covers approximately 1,166 square miles. It is mainly composed of the Beaver Lake reservoir, which is the primary source of drinking water for over 400,000 people in the region. The hydrology of the watershed is heavily influenced by the Ozark Mountains and receives an average of 44 inches of precipitation per year. The watershed's snowpack is generally light and infrequent, with occasional winter storms bringing a few inches of snow. Surface water in the watershed is primarily composed of streams and tributaries that flow into Beaver Lake. The reservoir's water constituents are closely monitored to ensure water quality for the surrounding communities. Interesting climatic facts include the region experiencing an average of 215 sunny days per year, and average temperatures ranging from 37°F to 91°F. Trends in the region have shown an increase in precipitation over the past decade, and a rise in average temperatures.