Cal. Pub. Res. Code § 8301

The Governor, on application therefor by a duly authorized agent, may convey to the United States any tract of land not exceeding 10 acres, belonging to the State and covered by navigable waters, for the site of a lighthouse, beacon, or other aid to navigation. After conveyance, the United States shall have jurisdiction over the tract, subject to the right of the State to have concurrent jurisdiction so far that all process, civil or criminal, issued under authority of the State may be executed by the proper officers thereof within the tract, upon any person amenable thereto, in like manner and with like effect as if the conveyance had not been made.