The following four symposia were conducted as part of the Reassessment with the purpose of assessing the current state of the science of hypoxia. An additional workshop on the science of nutrients in the Mississippi River Basin contributed to the reassessment.

Sources, Transport, and Fate of Nutrients in the Mississippi and Atchafalaya River Basins
November 7–9, 2006 in Minneapolis, MN

Nutrient Loading & Removal in the Lower Mississippi River Basin: Data, Trends & Opportunities
June 1–2, 2006, New Orleans, LA

Hypoxia in the Northern Gulf of Mexico: Assessing the State of the Science
April 25-27, 2006, New Orleans, LA

Gulf Hypoxia and Local Water Quality Concerns Workshop
September 26-28, 2005, Ames, IA