Such land and the zoning district classification thereof shall be as shown on the map designated as the "City of Rock Island Zoning Map," dated and signed by the City Clerk upon adoption. This zoning map and all notations, dimensions, references and symbols shown thereon pertaining to such districts will be a part of this Code as if fully described herein and will be filed as part of this Code by the City Clerk. Said zoning map will be available for public inspection in the office of the City Clerk and any later alterations of this map adopted by amendment as provided in Chapter of this Code will be similarly dated, filed and made available for public reference.

The following rules apply with respect to the boundaries of the various zoning districts as shown on the City of Rock Island Zoning Map:

4.2a District boundary lines are the centerlines of highways, streets, alleys, easements, railroad rights-of-way, toll roads, expressways, rivers and other bodies of water, or section, division of section, tract and lot lines; or such lines extended, unless otherwise indicated.

4.2b Boundaries indicated as approximately following the centerlines of highways, streets, alleys, easements, toll roads or expressways shall be construed to follow such centerlines.

4.2c Boundaries indicated as approximately following platted lot lines shall be construed as following such lot lines.

4.2d Boundaries indicated as approximately following city limits shall be construed as following city limits.

4.2e Boundaries indicated as following railroad lines shall be construed to be the established centerline of the right-of-way or if no centerline is established, the boundary shall be interpreted to be midway between the right-of-way lines.

4.2f Boundaries indicated as approximately following the centerlines of rivers or other bodies of water shall be construed to follow such centerlines, and in the event of change in the centerline, shall be construed as moving with the centerline; the centerline shall be interpreted as being midway between the shorelines.

4.2g Boundaries indicated as parallel to or extensions of features indicated in Subsections 4.2a through 2f of this Section shall be so construed.

4.2h Whenever any street, alley or other public right-of-way is vacated by official action of the City Council or whenever such area is franchised for building purposes, the zoning district line adjoining each side of such street, alley or other public right-of-way shall be automatically extended to the centerline of such vacated street, alley or public right-of-way and all area so involved shall then and henceforth be subject to all regulations of the extended districts.

4.2i Boundaries indicated as dividing a lot or tract shall be construed as being located as shown on the City of Rock Island Zoning Map.

4.2j Distances not specifically indicated on the City of Rock Island Zoning Map shall be determined by the scale of the map. (Ord. 070-2020, 12-21-2020)