Cal. Sts. & Hy. Code § 2211
The department shall notify each county, as soon as possible each year, of the amount of money to be available for expenditure in the county from the federal apportionment and of the amount of money to be made available pursuant to Section 2210.
After receiving notice of apportionment from the department, each county shall have 60 days in which to notify the department as to what amount of the apportionment the county wishes to claim and to agree to provide matching funds therefor. The counties, in cooperation with the department, shall thereafter select projects in conformance with federal law. The counties shall prepare plans, specifications, and estimates of cost for construction of the projects, and shall certify the necessary right-of-way and shall submit such documents to the department to qualify for the federal funds.
Ca. Sts. and High. Code § 2211