Any tree growing on a public alley, street or highway, but so located as to extend its branches over a public alley, street or highway, shall be so trimmed by the owner of the property on which the tree stands, or by his agents, that there shall be a clear height of twelve feet above the surface of the street, alley or highway and eight feet above the surface of the sidewalks unobstructed by branches, and such owner or his agents shall remove all dead branches and stubs of such tree or trees which are or may become a menace to travelers on the public highways, streets, alleys or sidewalks of the city. Trees whose roots are causing upraised sidewalk slabs or are similarly causing trouble are declared a nuisance.

If a tree or its parts in any other way cause a hindrance to the general public or if it is considered “troublesome,” or in any way may endanger the security and usefulness of any public street, highway, alley, sewer or sidewalk, as determined by the city superintendent, it is declared to be a public nuisance. If the owner of such private property does not correct or remove such nuisances within a reasonable time specified in writing by the city superintendent, he shall cause the nuisance to be corrected or removed and the cost shall be assessed to such owner.