Cal. Water Code § 55377

Any improvement provided for in this division may be located, constructed and maintained in, along, or across any public road or highway, or publicly owned right of way in the county, in such manner as to afford security for life and property; but the board shall restore, or cause to be restored, the road or highway, or publicly owned right of way to its former state, as near as may be, or in a sufficient manner not to have impaired unnecessarily its usefulness.