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Document S1. Additional supporting information mentioned in the text, including basin description, additional SPARROW model details, calculation of reservoir and lake attenuation values, catchment source shares, and an overview of input data used in the TN and TP Missouri River Basin SPARROW models, may be found in the online version of this article. Additionally, a web-based decision support system (DSS) has been developed to provide access to SPARROW model data, including input data, load estimates, confidence intervals, and standard errors of prediction. The DSS also offers scenario testing of altered inputs for research and water-quality planning (Booth et al., 2011; this issue). The SPARROW DSS application is available at: http://water.usgs.gov/nawqa/sparrow/dss. [Correction made here after initial online publication.]

Figure S1. Geography of the Missouri River Basin.

Figure S2. (a) Land use and (b) physiography of the Missouri River Basin.

Figure S3. Model diagnostics for total nitrogen: (a) observed against predicted load; (b) observed against

predicted yield; (c) log residuals against predicted load; and (d) log residuals against predicted yield.

Figure S4. Model diagnostics for total phosphorus: (a) observed against predicted load; (b) observed against predicted yield; (c) log residuals against predicted load; and (d) log residuals against predicted yield.

Figure S5. Mean annual load estimated from stream water-quality monitoring data and discharge measurements for (a) total nitrogen and (b) total phosphorus, in kilograms per year, in the Missouri River Basin, normalized to 2002.

Figure S6a. Boxplots of basin characteristics for sources used in the TN and TP SPARROW models for the calibration reaches and all the reaches in the Missouri River Basin.

Figure S6b. Boxplots of basin characteristics for land-to-water delivery variables used in the TN and TP SPARROW models for the calibration reaches and all the reaches in the Missouri River Basin. [Correction made here after initial online publication.]

Figure S7. Estimates of nutrient contributions from point sources based on the mean of 1992, 1997, and 2002 data for (a) total nitrogen and (b) total phosphorus, in kilograms, in the Missouri River Basin.

Figure S8. Developed land (all classes) normalized by incremental catchment area, in percent, in the Missouri River Basin.

Figure S9. Open-space developed land (a) as a percent of total developed land area, and (b) normalized by incremental catchment area, in percent, in the Missouri River Basin, 2001.

Figure S10. Nutrient inputs per unit area from farm fertilizer as (a) total nitrogen and (b) total phosphorus, by county in kilograms per square kilometer, in the Missouri River Basin, 2002.

Figure S11. Nutrient inputs per unit area from confined and unconfined manure as (a) total nitrogen and (b) total phosphorus, by county in kilograms per square kilometer, in the Missouri River Basin, 2002.

Figure S12. Nitrogen inputs from atmospheric deposition from measurements of wet deposition of total inorganic nitrogen, in kilograms per square kilometer per year, in the Missouri River Basin, 2002.

Figure S13. Stream channel length as a source of phosphorus (for streams where discharge is >1.13 m3/s), in kilometers, in the Missouri River Basin.

Figure S14. Mean annual precipitation, in millimeters, in the Missouri River Basin, 1971-2000.

Figure S15. Mean of maximum and minimum air temperature, in degrees Celsius, in the Missouri River Basin, 1971-2000.

Figure S16. Estimated agricultural area in gravity and pressure irrigation, in percent, in the Missouri River Basin, 1997.

Figure S17. Loess-dominated surficial geology in the Missouri River Basin.

Figure S18. Mean soil permeability, in centimeters per hour, in the Missouri River Basin.

Figure S19. Mean basin slope, in percent, in the Missouri River Basin.

Table S1. Sources of water-quality and discharge monitoring data used to estimate mean annual nutrient

load.

Table S2. List of Standard Industrial Classification codes included and excluded from the Missouri River Basin SPARROW models.

Table S3. National Land Cover Database class definitions for developed land, 2001 (from http://www.mrlc.gov/nlcd_definitions.php, accessed June 2011).

Table S4. Summary of loess-dominated surficial geology by major subbasin.

Appendix S1. Source shares (in percent of load) in the total catchment of the major subbasins. Source shares correspond to the data in Figure 7a in main manuscript. [Correction made here after initial online publication.]

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Please note: Wiley Blackwell is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.