The Lower Illinois Lake Chautauqua watershed (HUC 07130003) covers an area of 1,296 square miles in north-central Illinois. The hydrology of the region is dominated by the Illinois River and its tributaries. The area receives an average snowfall of 30 inches per year. The watershed is home to several surface water bodies, including Lake Chautauqua, which is a popular recreational destination. Water quality in the reservoir is monitored, and constituents such as nutrients and sediment are a concern due to agricultural runoff and urban development. Interesting climatic facts include an average temperature of 51 degrees Fahrenheit and an average annual precipitation of 34 inches. Trends in the region show an increase in average annual temperature and precipitation, which could have implications for water resources and ecosystem health.