§ 26. Official map, establishment. Every city by ordinance, local law
or resolution of the legislative body which has the authority to lay
out, adopt and establish streets, highways and parks may establish an
official map of the city showing the streets, highways and parks
theretofore laid out, adopted and established by law. Drainage systems
may also be shown on this map. Such map is to be deemed to be final and
conclusive with respect to the location and width of streets, highways,
drainage systems and the location of parks shown thereon. Such official
map is hereby declared to be established to conserve and promote the
public health, safety and general welfare. Said ordinance, local law or
resolution shall make it the duty of some appropriate official or
employee of said city at once to file with the clerk or register of the
county or counties in which said city is situated a certificate showing
that the city has established an official map.