Estimated nutrient and sediment concentrations from major rivers in Illinois based on continuous monitoring from October 1, 2015, through September 30, 2021

During water years 2016–2021 (a water year begins on October 1 and ends on September 30 and is designated by the year in which it ends), the U.S. Geological Survey...在2016至2021水文年（water year）期间，其中水文年始于10月1日、止于9月30日，并以其结束的年份命名，美国地质调查局（U.S. Geological Survey）……