On February 7, 1925, the Daughters of the American Revolution placed a bronze plaque which reads, "Fort Humboldt. Occupied by U.S. troops from 1853 to 1865. General U. S. Grant was stationed here in 1853." The plaque is still at the park, though hidden by trees. The tablet is bronze mounted on a huge rock blasted from Medicine Rock near Trinidad. The original plaque was stolen and was later replaced by the Daughters of the American Revolution.
