Redwood City March 2003: Salt Pond Barrier

The salt ponds are separated by a wall. It's made of dirt, held together with a layer of boards on each side. There's an occasional sluice gate.

In his book Salt: A World History, Mark Kurlansky writes

...After a few years of scraping, the area was running out of naturally evaporated salt, and the salt producers started building successive artificial ponds, pumping the water from one pond to the next by the power of windmills.

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