Date: May-October 1993
Significance: With more than $15 billion in damages, the flood was the second costliest on record; 50 flood-related deaths
Holmes says: In St. Louis, Missouri, the waters stayed at flood stage for 81 consecutive days. This is the flood that came and stayed forever. That's the thing that sticks in my mind that it lasted such a long time. I was young in my career at that point I had been working as a hydrologist for only seven or eight years. I was out working on that flood for what seemed like forever.