The Iroquois Watershed (HUC 07120002) covers approximately 4,700 square miles in parts of New York and Pennsylvania. The watershed is primarily forested with agricultural and urban areas throughout. The hydrology of the watershed is diverse, with many small streams feeding into larger rivers such as the Allegheny River. The snowpack in the watershed varies depending on elevation, with higher elevations receiving more snow. Surface water quality is important in the watershed, as it is home to many freshwater fish species including trout and bass. The watershed also contains several reservoirs used for flood control and water supply. Interesting climatic facts include the fact that the area experiences significant lake-effect snowfall due to its proximity to Lake Erie. Climate trends in the watershed include increasing average temperatures and changing precipitation patterns, which could have significant impacts on water resources and aquatic ecosystems.