Supermoons create larger tides than usual, known as "perigean spring tides." However, the effect is relatively small, only raising the water level a few inches above normal spring tides.

AP Photo/Eric Schultz, AL.com
The Moon rises next to a Saturn 1B rocket at the U.S. Space and Rocket Center Sunday, Aug. 10, 2014 in Huntsville, Ala. The 224-foot-tall Saturn 1B was a forerunner of the Saturn V launch vehicle for NASA missions to the moon.