Betsy also drove a storm surge into Lake Pontchartrain, just north of New Orleans, and the Mississippi River Gulf Outlet, a deep-water shipping channel to the east and south. Levees for the Mississippi River Gulf Outlet along Florida Avenue in the Lower Ninth Ward and on both sides of the Industrial Canal failed. The flood water reached the eaves of houses in some places and over some one story roofs in the Lower Ninth Ward. Some residents drowned in their attics trying to escape the rising waters.