Nation Mississippi River flood is longest-lasting in over 90 years, since ‘Great Flood’ of 1927 May 28, 2019May 29, 2019Doyle Rice, USA TODAYComments Off on Mississippi River flood is longest-lasting in over 90 years, since ‘Great Flood’ of 1927 Flooding along portions of the Mississippi River is the longest-lasting flood since 1927, during that year's Great Flood.