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Incorporating Uncertainty into the Ranking of SPARROW Model Nutrient Yields from the Mississippi/Atchafalaya River Basin Watersheds

Article and supplemental material in Journal of American Water Resources Association

Technical Announcement

Maps and Tables

Ranking and Confidence Intervals for Top 150 Watersheds with highest delivered yields to the Gulf: Which watersheds are in the top 150? Which watersheds are not in the top 150? Which watersheds cannot be reliably placed in or out of the top 150?

• Total Phosphorus Yields for HUC8 watersheds in the Mississippi/Atchafalaya River Basin
  
  
• Ranking of Total Phosphorus Yields Delivered to the Gulf of Mexico
  
  
• Total Nitrogen Yields for HUC8 watersheds in the Mississippi/Atchafalaya River Basin
  
  
• Ranking of Total Nitrogen Yields Delivered to the Gulf of Mexico
  
  
• Tables showing ranking of delivered yields of total phosphorus and total nitrogen for 818 eight digit hydrologic unit code (HUC8) watersheds in the Mississippi/Atchafalaya River Basin, (more details are provided in the JAWRA supplemental material)

Frequently Asked Questions

Related links:

• ES&T Online News article "Top nutrient contributors to dead zone identified"
  
• SPARROW Fact Sheet
  
• USGS SPARROW model
• Differences in Phosphorus and Nitrogen Delivery to the Gulf of Mexico from the Mississippi River Basin
  
• EPA Homepage on the Mississippi River Basin and Gulf of Mexico Hypoxia
• Hypoxia in the Gulf of Mexico and Related USGS Activities

For additional information on the study, please contact:

Dale Robertson
U.S. Geological Survey
8505 Research Way
Middleton, WI 53562-3581
Email: dzrobert@usgs.gov

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