The Ohio Brush-Whiteoak Watershed (HUC 05090201) covers approximately 1,163 square miles in southwestern Ohio. The watershed is mainly rural, with agriculture as the primary land use. The hydrology of the area is dominated by the Ohio River and its tributaries, including the Brush and Whiteoak Creeks. The watershed receives an average of 44 inches of precipitation per year, with winter snowpack being a minor contributor. Surface water quality is generally good, but the area's reservoirs have experienced issues with algal blooms and excess nutrients. Interesting climatic facts include the area's susceptibility to severe thunderstorms in the summer months and occasional winter ice storms. Trends in the watershed include increased urbanization and land-use changes due to population growth and development. Efforts to improve water quality and protect natural resources are ongoing in the Ohio Brush-Whiteoak Watershed.