California Code, Streets and Highways Code - SHC § 1026

(a) Order the whole or any portion of the aggregate expense to be paid out of the road fund of the county.

(b) By a majority vote of the board's membership, order the whole or any portion of the expense of construction or repair of such bridges or tunnels, or a portion of the expense of the purchase of such toll roads, to be paid out of the county general fund.

(c) By unanimous vote of the board's membership, order the whole or any portion of the expense of material for highway construction to be paid out of the county general fund.

(d) By a four-fifths vote of the board's membership, order to be paid out of the county general fund or the road fund, or both, the whole or any portion of the expense of constructing, reconstructing or repairing any bridges or highways destroyed or damaged by storms, floods or calamities.