The Richland Watershed (HUC 12030108) covers an area of approximately 582 square miles in southwestern Montana. The hydrology of the watershed is dominated by the Big Hole River, which flows through the center of the area. The watershed receives a significant amount of snowfall in the winter, with an average snowpack of around 75 inches. The surface water in the watershed is generally of good quality, and supports a variety of fish and wildlife species. There are several reservoirs in the watershed, including the Clark Canyon Reservoir and the Hasler Reservoir, which are used for irrigation, flood control, and recreation. The watershed is also home to a number of interesting climatic facts and trends, including a relatively high incidence of lightning strikes and severe thunderstorms during the summer months. Overall, the Richland Watershed is an important resource for Montana's agriculture, tourism, and recreation industries, and is an important part of the state's natural heritage.