Section 6804 Of General Provisions From California Harbors And Navigation Code >> Division 8. >> Part 6.

. If any land under a navigable stream, is by virtue of any work or improvement by the United states or the State, freed from the easement of navigation and fishing, it reverts to the district, to be used for the purposes and objects for which the district was organized. If the lands are not used or held for these purposes, they revert to the State.