These graphs illustrate nitrate-N in the Raccoon and Des Moines Rivers (at Des Moines). Each graph is duplicated; in the first, the data is sorted by magnitude, in the second, the data is sorted chronologically. Loads are the total mass of nitrogen delivered by the river. Concentration is reported as an average of the daily values in milligrams per liters (mg/L) with linear interpolation for non-analysis days. Graphs show August values, and the year-to-date values through August 31 (i.e. January-August).