The St. Joseph Watershed (HUC 04050001) covers an area of approximately 1,860 square miles in Michigan and Indiana. The watershed includes a variety of land uses, including forest, agricultural, and urban areas. The hydrology of the watershed is influenced by the St. Joseph River, which is fed by several tributaries. The watershed experiences a significant amount of snowfall during the winter months, which contributes to the surface water flow. Surface water quality in the St. Joseph Watershed is impacted by various constituents, including nutrients, sediment, and bacteria. The watershed is home to several reservoirs, including the Diamond, Baldwin, and Lake of the Woods Reservoirs. Interesting climatic facts and trends in the watershed include increasing temperatures and precipitation over the past several decades. Additionally, there has been a trend towards more extreme weather events, including heavy rainfall and flooding. These trends are likely to continue in the future, with potential impacts on the hydrology and ecology of the St. Joseph Watershed.