A. Street Widths: Major and collector streets shall conform to the width assigned on the master street plan wherever a subdivision falls in an area for which a master street plan has been adopted. Where a master street plan has not been completed at the time a preliminary plan is submitted to the planning commission, streets shall be provided as follows:
1. Residential streets shall have a minimum width of forty eight feet (48'). Width is determined as the combined dimensions of the pavement, curb and gutter on both sides, and four foot (4') paved sidewalk on both sides.
2. Collector streets shall have a minimum width of fifty five feet (55'), or conform to the master street plan, whichever is greater.
3. Minimum width of roadway wherever curb and gutters are installed (face to face of curb) shall be as follows:
a. For residential streets, thirty six feet (36').
b. For collector streets, forty four feet (44').
B. Alleys: Alleys shall have a minimum width of twenty feet (20'). Alleys may be required in the rear of business lots or residential blocks, under conditions where such alleys are considered necessary by the planning commission.
C. Reverse Curves: Reverse curves shall have a tangent of at least one hundred feet (100'), unless in the opinion of the planning commission such is not necessary.
D. Street Intersection: Streets shall intersect each other as nearly as possible at right angles. Minor streets shall approach the major or collector streets at an angle of not less than eighty degrees (80°). Offsets in street alignment of more than ten feet (10') or less than one hundred twenty feet (120') shall be prohibited.
E. Street Grades: Minimum street grades of six-tenths percent (0.6%) will be required with the maximum grade being seven percent (7%) for collector streets and ten percent (10%) for minor streets. Where the observance of this standard is unfeasible, the planning commission shall have the power to grant an exception when special pavement surfaces and adequate leveling areas are installed or, in the opinion of the planning commission, the best subdivision of the land has thereby occurred.
F. Street Curves: Where the street lines within a block deflect from each other at any one point more than ten degrees (10°), there should be a connecting curve. The radius of the curve for the inner street line should not be less than three hundred fifty feet (350') for major streets, two hundred fifty feet (250') for an important neighborhood street, and one hundred feet (100') for minor streets.
G. Curbs: Curbs at all intersections shall be rounded with curves having a minimum radius of fifteen feet (15') for minor streets and twenty five feet (25') for collector and major streets. Property lines at street intersections should be rounded with a curve where necessary to fit the curb radius, except where a curb will connect to existing city street.
H. Street Names: New street names should not duplicate or approximately duplicate those already existing. A street obviously a continuation of another already in existence should bear the same name. Before the street is named, the proposed name must be submitted to and approved by the planning commission.
I. Street Dedications: All streets shall be dedicated for public use. The dedication of half streets in any subdivision is prohibited, except on the borders.
J. Relations To Adjoining Street System: The arrangement of the streets in new subdivisions shall make provision for the continuation of the existing streets in adjoining areas (or their proper projection where adjoining land is not subdivided) at the same or greater width (but in no case less than the required minimum width), unless variations are deemed necessary by the planning commission, insofar as such may be deemed necessary for public requirements. The street arrangement must be such as to cause no unnecessary hardship to owners of adjoining property when they plat their own land and seek to provide for convenient access to it. Where, in the opinion of the planning commission, it is desirable to provide for street access to adjoining property, proposed streets shall be extended by dedication to the boundary of such property.
K. Cul-De-Sacs: Cul-de-sacs (dead end streets) shall be used only where unusual conditions exist which make other designs undesirable. Each cul-de-sac shall be terminated by a turnaround of minimum diameter of eighty feet (80'), except that where surface water cannot be drained away from the turnaround along the street due to grade, necessary catch basins and drainage shall be provided.
L. Easements: Where alleys are not provided, easements of not less than eight feet (8') on each side of all rear lot lines and side lines will be required where necessary for poles, wires, conduits, storm or sanitary sewers, gas and water mains, and other public utilities. Easements of greater width may be required along property lines where necessary for surface overflow or for the extension of sewer mains or similar utilities.
M. Private Streets: A means of perpetual maintenance must be demonstrated to and approved by the planning commission before a private road may be approved. (Ord. 2014-02, 4-8-2014)