All public highways in this state, outside incorporated cities and towns and not designated as state highways, which have been used as public highways for a period of not less than seven years, where they have been worked and kept up at the expense of the public, are county roads.
[ 1963 c 4 § 36.75.070. Prior: 1955 c 361 § 2; prior: 1945 c 125 § 1, part; 1937 c 187 § 10, part; Rem. Supp. 1945 § 6450-10, part.]