The Havasu Mohave Lakes Watershed (HUC 15030101) covers an area of approximately 4,300 square miles in Arizona and Nevada. This watershed includes several large lakes and important water resources, such as Lake Mead and Lake Havasu. The hydrology of the region is characterized by a hot and dry climate, with limited precipitation and high evaporation rates. The watershed receives most of its water from snowpack in the mountains during the winter months. The snowpack generally begins to accumulate in December and peaks in February. The surface water in the watershed is highly regulated, with a variety of dams and reservoirs used to manage water levels and supply. The main constituents of these reservoirs are silt, sand, and organic matter. Interesting climatic facts include the extreme heat and dryness of the region, which has led to increased wildfires and drought conditions in recent years. Trends in the region suggest that climate change may exacerbate these conditions in the future.