309.74 Width of bridges and culverts. All culverts shall have a clear width of roadway of at least twenty feet. Bridges shall have a clear width of roadway of at least sixteen feet. [C51, §517; R60, §822; C73, §1001; C97, §1572; S13, §1527-s7; C24, 27, 31, 35, 39, §4667; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §309.74]
Iowa Legal Code