WRTDS bootstrapped concentration and load trend likelihoods for sites in the Spokane River watershed, water years 1990 to 2018

Weighted Regressions on Time, Discharge and Season (WRTDS) models were developed for total and dissolved cadmium, lead and zinc; total phosphorus and nitrogen; and dissolved orthophosphate at twelve sites in the Spokane River watershed for water years 1990 to 2018. Bootstrapped model replicates were run to determine the statistical likelihoods of trends in flow-normalized concentrations and loads over the period of record and water years 2009-2018 for each constituent at each site. The data table contains the change in concentrations and loads and the numeric and descriptive statistical likelihoods associated with the trends over the two time periods for each constituent and site.