Neb. Rev. Stat. § 17-508: Neb. Rev. Stat. § 17-508

Cities of the second class and villages shall have the power to provide for the grading and repair of any street, avenue, or alley and the construction of bridges, culverts, and sewers. No street, avenue, or alley shall be graded unless such street, avenue, or alley shall be ordered to be done by the affirmative vote of two-thirds of the city council or village board of trustees.