Regular water quality sampling occurs along the Des Moines River from upstream of the Saylorville Reservoir to below the dam at Red Rock Reservoir. The data included in this data set are the mean monthly nitrate concentrations and flow from the sampling station upstream of Saylorville Reservoir from 1976-2016.
This dataset is to accompany paper in review: "Beyond the trends: The need to understand multi-annual dynamics in aquatic ecosystems" (Limnology and Oceanography Letters)