(1) Length. Intersecting streets, which determine block length, shall be provided at such intervals as to serve cross traffic and to meet existing streets in the neighborhood. In residential districts, where no existing plats are recorded, the blocks shall not exceed 1,200 feet in length, except that in outlying subdivisions a greater length may be permitted where topography or other conditions justify a departure from this maximum. In blocks longer than 1,000 feet, pedestrian ways and/or easements through the block may be required by the planning commission near the center of the block. Such pedestrian ways or easements shall have minimum width of 10 feet. Blocks for business uses should normally not exceed 600 feet in length.
(2) Width. In residential subdivisions, the block width shall normally be sufficient to allow two tiers of lots of appropriate depth. Blocks intended for business or industrial use shall be of such width and depth as may be considered most suitable for the prospective use.
(1) Relations to Adjoining Street System: The arrangement of streets in new subdivisions shall make provisions for the continuation of the existing streets in adjoining additions (or their projection where adjoining property is not subdivided) insofar as they may be necessary for public requirements. The width of such streets in new subdivisions shall not be less than the minimum street widths established herein. Alleys, when required, and streets shall be arranged to permit owners of adjoining unsubdivided property to extend streets into the unsubdivided property. Whenever there exists a dedicated or platted half-street or alley adjacent to the tract to be subdivided, the other half of the street or alley shall be platted, and dedicated.
(2) Street Names: Streets that are obviously in alignment with existing streets shall bear the names of the existing streets.
(3) Major Streets: Major streets through subdivisions shall conform with the major street plan shown in the adopted comprehensive plan.
(4) Minor Streets: Minor streets shall be so designed as to discourage through or non-local traffic.
(5) Cul-de-sacs: Cul-de-sacs shall be permitted when topography or ownership prevents normal subdivision of a tract or plat of ground. The cul-de-sac shall normally be no longer than 500 feet, including an adequate turnaround which shall be provided at the closed ends.
(6) Right Angle Intersections: Under normal conditions, streets shall be laid out to intersect, as nearly as possible, at right angles. Where topography or other conditions justify a variation from the right angle intersection, it may be permitted by the planning commission. The minimum allowable angle shall be 60 degrees.
(7) Streets Adjacent to a Railroad Right-of-Way, Limited Access Freeway, or Principal Highway: Where lots front or side, but do not back, on railroad rights-of-way, major streets, or highways, a marginal access street or frontage road shall be provided, parallel and adjacent to the boundary of such right-of-way. The distance of the street from the right-of-way shall be determined with due consideration given to minimum distance required for approach connections to future grade separations or intersections.
(8) Half-Streets: Dedication of half-streets will not be approved, except where it is essential to the reasonable development of the subdivision and is in conformity with the approved major street plan and other requirements of these regulations.
(9) Alleys: Alleys shall be provided in commercial and industrial districts, except where other definite and assured provisions are made for service access to off-street loading and unloading areas and to off-street parking areas, consistent with and adequate for the uses proposed Dead end alleys shall be avoided. Alleys may be required in certain residential areas.
(10) Minimum Requirements: All streets, alleys and public ways, included in any subdivision, hereafter dedicated and accepted, shall not be less than the minimum dimensions for each classification as follows:
(a) Major Streets
(i) Arterials: Width of 80 feet
(ii) Collectors: Width of 70 feet
(b) Local Streets: Width 60 feet
(c) Cul-de-sacs: Width 60 feet and the turnaround shall have a radius of 60 feet
(d) Marginal Access Streets or Frontage Roads:
(i) One-Way: Width 50 feet
(ii) Two-Way: Width 60 feet
(iii) Alleys: Width 20 feet
(iv) Pedestrian Ways: Width 10 feet
(11) Additional Requirements: When existing or anticipated traffic on arterial and/or collector streets warrants greater right-of-way width, the additional right-of-way shall be provided.
(12) Drainage Easements: Drainage easements shall be required, in addition to street rights-of-way, where the street or streets adjoin or are parallel with streams or drainage areas or where lots back on the drainage areas. The width of such drainage easement shall be determined by the city engineer.
(13) Street Grades: The grades of streets, alleys and other public ways included in any subdivision shall not be greater than is necessary for the topographical conditions.
(14) Street Alignments: Minimum horizontal and vertical alignment on all streets, except in unusual cases, shall be as follows:
(a) Horizontal Alignment: Radii at the centerline.
Major Streets - 300 Feet
Local Streets - 100 Feet
A tangent shall be provided between all reversed curves to provide for a smooth flow of traffic.
(b) Vertical Alignment: All changes in street grade shall be connected by vertical curves of such length as to provide for desired sight distance.
(1) The minimum lot width for interior lots shall be 70 feet. Corner lots shall have a minimum width of 90 feet in order to maintain a front yard on both streets. The lot width shall be measured at the building setback line.
(2) The minimum lot depth shall be 120 feet. The measurements shall be measured through the center of the lot and shall be perpendicular to the property line or radial to the property line on curved streets.
(3) Minimum lot area shall be subject to be the zoning district regulations in which the subdivision is located.
(4) In subdivisions where septic tanks or other individual sewage disposal devices are to be installed, the size of all lots included in the subdivision shall be subject to regulations in Article 31 Requirements for Each Class of Subdivision.
(5) In subdivisions where private water supply is by well or other means, the size of all lots included in the subdivision shall be subject to regulations in Article 32 Requirements for Each Class of Subdivision.
(6) All side lot lines shall bear 60 to 90 degrees from the street right-of-way line on a straight street or from the tangent of a curved street.
(7) Double frontage lots shall be avoided unless, in the opinion of the planning commission, a variation to this rule will give better street alignment and lot arrangement.
(8) Every lot shall abut on a street other than an alley.
(9) Building or setback lines shall be shown on the preliminary plat and the final plat for all lots in the subdivision and shall not be less than the setback required by the zoning ordinance.
(10) The subdivision or resubdivision of a tract or lot shall not be permitted where the subdivision or resubdivision places an existing permanent structure in violation of these subdivision regulations and/or the requirements of the zoning ordinance.
(11) No more than one principal building or use shall be located upon any platted lot or lot of record. Provided, however, that buildings or uses which are merely accessory may be located on the platted lot or lot of record together with the principal building or use.
(1) Where alleys are not provided, permanent easements of not less than seven and one-half feet in width shall be provided on all rear lot lines, and on side lines where necessary, for utility poles, wires and conduits; sanitary sewers; gas, water and heat mains; and other public utilities. These easements shall provide for a continuous right-of-way at least 15 feet in width.
(2) A 12 foot temporary construction easement shall be provided on each side of the permanent easement required in (a) above for initial construction of water, sewer and other utility lines.
(3) Where a lot or group of lots side or back on an existing high pressure oil line or existing high pressure gas line, a 75 foot easement shall be provided on that part of the lot which abuts the oil line or gas line and no building or structure shall be located or constructed within the 75 foot easement.