California Code, Streets and Highways Code - SHC § 1671

The agreements shall be entered into pursuant to the provisions of Section 8 of the act of Congress, approved July 11, 1916, entitled “An act to provide that the United States shall aid the states in the construction of rural post roads and for other purposes,”   1 or pursuant to the provisions of Section 23 of the Federal-Aid Highway Act,  2 upon such terms as may be agreed upon by the county and the Secretary of Agriculture.

The county board of supervisors may incur expenses necessary to perform its part of the cooperative agreements, and may pay the cost and expenses of the agreements out of the county general fund or such other fund as the board of supervisors designates or otherwise provides.