The Paul Witherspoon Lecture is given in recognition of outstanding achievements by a mid-career scientist (within 10 to 20 years since Ph.D.) in advancing the field of hydrologic sciences. It recognizes significant and innovative contributions by mid-career scientists to the hydrologic sciences through research aimed at socially important problems and through mentoring of young scientists. The award is named to honor the life and work of Paul A. Witherspoon, an accomplished hydrologist who was a leader in the field for more than 50 years.
- 2020 – Giuliano Di Baldassarre
- 2019 – Patrick Reed
- 2018 – Elizabeth Boyer
- 2017 – Thorsten Wagener
- 2016 – Paolo D’Odorico