Iowa Code Title VIII. Transportation [Chs. 306-330B] § 315.6. Funding of projects

a. Primary road and state park road projects may be financed entirely by the fund, or by combining money from the fund with money from the primary road fund, federal aid primary funds received by the state, money from cities or counties raised through the sale of general obligation bonds of the cities or counties, other city or county revenues, or money from participating private parties.

b. Secondary road, state park road, and county conservation parkway projects may be funded entirely by the fund or by combining money from the fund with money from the county's portion of road use tax funds, federal aid secondary funds, other county revenues, money raised through the sale of general obligation bonds of the county, or money from participating private parties.

c. City street and state park road projects may be funded entirely by the fund, or by combining money from the fund with money from the city's portion of road use tax funds, federal aid urban system funds, other municipal revenues, money raised through the sale of general obligation bonds of the city, or money from participating private parties.