The U.S. Bureau of Reclamation on Friday successfully dodged claims its management of a California dam violates state law and threatens the survival of endangered steelhead trout, but the legal battle is far from over. U.S. District Judge Edward Chen rejected a move by conservationists to add the United States as a “necessary party” to a state court action involving disputed rights to water from the Twitchell Dam and Reservoir in San Luis Obispo County.