The Salt Works in Seaside marks the site where the Lewis and Clark expedition set up a camp and boiled seawater to obtain salt for use at Fort Clatsop and on the return journey to St. Louis.

The salt cairn display is located near the Prom at Lewis and Clark Way, south of the Turnaround.

The salt works in Seaside was crucial to the early explorers, who used salt to cure meat. Altogether, members of the expedition ate about 10 pounds of meat each per day.