Parts of Cherry Grove sit on made ground. The inlet between Futch Beach and the Nixon land was filled in 1950, and the 1970s turned the marsh behind the beach into a grid of channels with house lots between them. Those channels are the finger canals the docks and back yards line up on today, and on a lot like that the tide sits close under the floor and moves twice a day.
The older lots toward the Intracoastal Waterway behave the same way. Windy Hill was built by Conway investors after World War II, and the state encyclopedia describes the layer before it plainly: simple frame houses, some built on stilts, along the oceanfront. Little River, farther north on the Waterway, takes the heaviest rain totals on this end of the coast. A house on piers has an open void underneath, and whatever the ground and the air are doing out there, the joists are doing too.
The city’s hazard notes say North Myrtle Beach floods from the Atlantic, from the Intracoastal Waterway and inland from the Waccamaw, and they define tidal flooding as low ground going under during exceptionally high tides, at full and new moons. Those notes are written about streets. The water reaches the crawl space on the same tide.