The existence of any obstruction to a street, alley, crossing or sidewalk, and any excavation in or under any street, alley, crossing or sidewalk, which is by ordinance prohibited, or which is made without lawful permission, or which, having been made by lawful permission, is kept and maintained after the purpose thereof has been accomplished, and for an unreasonable length of time is proclaimed to be a public nuisance.
(Ord. 454 § 3(20), 1977; Ord. 1731 § 1, 2025)