California Code, Streets and Highways Code - SHC § 110

Nothing in this article shall prohibit any county or city from contributing to the State, in the manner provided by law, funds or real property or interests therein for the acquisition, construction, reconstruction, replacement, improvement or maintenance of any such bridge as is provided for by Sections 106, 107 and 108, nor prohibit the relinquishment of any such bridge by the department to any county or city.  Upon relinquishment such bridge shall be under the supervision and control of the county or city to which it is relinquished.