Isla Calafia lies under 300 feet of water on the highest part of a huge underwater ridge.
California led the nation in closures and advisories with 5,780, compared to 3,547 in 1999.
The ruckus in one of the most beautiful places in the country has galvanized an unusual alliance of environmentalists, ranchers and business folk who are upset with a U.S. Navy proposal to conduct 3,000 practice bombing raids a year at Fort Hunter Liggett.
The new refuge is part of the Hopper Mountain National Wildlife Refuge Complex in Ventura, Calif.
Under-supervised school groups visiting the tide pools can sometimes digress into a crew of inadvertent poachers.