Floodmark elevations and approximate areas flooded by Hurricane Frederic tides of September 12-13, 1979, along coastal areas of Mobile Bay between Bellefontaine and Point Judith, Alabama, are shown on a topographic map. Storm-tide frequency and records of annual maximum tides at Mobile, Alabama, since 1772, are presented. Offshore winds reached about 160 miles per hour. A wind-velocity of about 145 miles per hour was recorded near Dauphin Island, Alabama. Most of the waterfront improvements in Mobile Bay were either destroyed or heavily damaged. The town of Bayou La Batre, Alabama, was extensively flooded.