Cal. Fish & Game Code § 5939

The hatchery, traps, and other equipment necessary to operate a hatchery station shall not be of a size greater than necessary to supply the stream or river with a reasonable number of fish. The owner of the dam shall permit the department to locate the hatchery, dwellings, traps, and other equipment upon any of the land of the owner of the dam upon a site or sites to be mutually agreed upon by the department and the owner of the dam.