El Niño / La Niña Local Effect on River Flooding

Obviously, if there is more rain during El Niño years, there is also likely to be more flooding on area rivers. The December through April river flooding graph below does indicate that during strong El Niño years vs. all other years (since December 1950) that most locations do flood more, some up to twice as often, in the winter and spring of strong El Niño years than all other conditions combined.