St Marys Rivermouth (Fernandina Beach)

St Marys Rivermouth is an exposed river-mouth/jetty surfing area at the north end of Amelia Island, where conditions can vary widely. Multiple descriptions emphasize that surf quality is inconsistent and depends on the interaction between incoming swell and the local sandbar and tidal flow near the river entrance. When the setup is right, the break can offer long, peeling rides—especially rights off the south jetty—while occasional lefts may form in/near the river mouth. Working swell directions reported include east-northeast (and related NE/ENE angles), with a typical “working” swell height window given around 0.6–1.5 meters, and wave quality described as average overall rather than consistently premium. Tide timing is a point of disagreement between sources: one set of information notes that tide does not affect quality, while another suggests mid tide can be more favorable. Practically, both sources align on the need to watch the outgoing/returning flow closely, because strong currents and rips near the inlet are a major factor in safety and rideability. Wind can also swing conditions quickly. Offshore winds are generally from the west/southwest and can help groom the waves, while east winds are more likely to create heavy chop. In summer, afternoon sea breezes are common but may make things choppy for surfing. Hazards to plan around include rocks/jetty hazards, shifting sandbars, and significant boat traffic in the shipping channel; lifeguards are not reported at the spot and rescue availability is described as limited.