California Code, Streets and Highways Code - SHC § 31141

All bonds authorized pursuant to this chapter shall be issued in the name of the authority and shall constitute obligations of the authority only.  Such bonds shall be identified as toll tunnel bonds and shall contain a recital on the face thereof that the payment or redemption of the bonds and the payment of the interest thereon is secured by a direct and exclusive charge and lien upon the tolls and other revenues of any nature whatever received from the operation of the toll tunnel, and that neither the payment of the principal or any part thereof or any interest thereon, constitutes a debt, liability, or obligation of the state or of El Dorado County.