During extreme low tides, on calm days, it is possible for visitors to walk down to the boiler.

Remains visible at extreme low tide include parts of its pier as well as various port buildings.

It experiences periodic flooding when extreme high tides or surges arrive.

The posts are still visible at extreme low tides.

Spring tides are the extreme tides that occur twice a month when the moon is new and full.

A narrow strip of land connected the island to the mainland, but it could be accessed only at extreme low tide, which was still dangerous.

You'll only see this lowest stretch of the ocean floor about twice a month, however, at extreme low tides.

However, it can be flooded by extreme tides and cut across by tidal channels.

Today, the boiler can still be seen at extreme low tides.

The period of extreme high tides began on Dec. 30 and should begin tapering off today.