(A) Comprehensive Plan. The arrangement of thoroughfares and collector streets shall conform as nearly as possible to the North Mankato Comprehensive Plan. Except for cul-de-sacs, streets normally shall connect with streets already dedicated in adjoining or adjacent subdivisions or provide for future connections to the adjoining unsubdivided tracts or shall be a reasonable projection of streets in the nearest subdivided tracts. The arrangement of thoroughfares and collector streets shall be considered in their relation to the reasonable circulation of traffic, to topographic conditions, to run-off of storm water, to public convenience and safety, and in their appropriate relation to the proposed uses of the area to be served.
(B) Marginal streets, cul-de-sacs and dead ends. Minor streets should be so planned as to discourage their use by non-local traffic. Dead end streets are prohibited, but cul-de-sacs will be permitted where topography or other conditions justify their use. Cul-de-sacs shall include a terminal turn-around which shall be provided at the closed end, with an outside curb radius of at least 40 feet and a right-of-way radius of not less than 50 feet.
(C) Partial development of plat. Where the plat to be submitted includes only part of the tract owned or intended for development by the subdivider, a tentative plan of a proposed future street system for the unsubdivided portion shall be prepared and submitted by the subdivider.
(D) Subdivision integration. When a tract is subdivided into larger than normal building lots or parcels, such lots or parcels shall be so arranged as to permit the logical location and openings of future streets and appropriate resubdivision, with provision for adequate utility connections for such resubdivision.
(E) Angle of intersections. Under normal conditions, streets shall be laid out so as to intersect as nearly as possible at right angles, except where topography of other conditions justify variations. The minimum angle of intersection of streets shall be 80 degrees.
(F) Marginal access. Wherever the proposed subdivision contains or is adjacent to the right-of-way of a limited access highway or thoroughfare, provision may be made for a marginal access street approximately parallel and adjacent to the boundary of such right-of-way, or for a street at a distance suitable for the appropriate use of land between such street and right-of-way. Such distance shall be determined with due consideration of the minimum distance required for approach connections to future grade separations or for lot depths.
(G) Alleys. Alleys shall be provided in commercial and industrial districts, except that this requirement may be waived where other definite and assured provision is made for service access, such as off-street loading, unloading and parking consistent with and adequate for the uses proposed alleys, where provided, shall not be less than 20 feet wide, except where justified by special conditions. Dead end alleys shall be avoided wherever possible, but if unavoidable, such dead end alleys may be approved if adequate turn-around facilities are provided at the closed end.
(H) Dedication of half streets. Dedication of half streets will not be approved, except where it is essential, to the reasonable development of the subdivision and in conformity with the other requirements of these regulations, where it is found that it will be practical to require the dedication of the other half when the adjoining property is subdivided, or where it becomes necessary to acquire the remaining half by condemnation so it may be improved in the public interest.
(I) Minimum right-of-way. For all public ways hereafter dedicated and accepted, the minimum right-of-way widths for streets and thoroughfares shall be as shown in the Comprehensive Plan, and where not shown therein, the minimum right-of-way width for streets, thoroughfares, alleys, or pedestrian ways included in any subdivision shall not be less than the minimum dimensions for each classification as follows:
(1) Primary thoroughfare: 80 feet;
(2) Secondary thoroughfare: 66 feet;
(3) Collector street: 66 feet;
(4) Minor street: 60 feet;
(5) Marginal access street: 50 feet;
(6) Alley: 20 feet;
(7) Pedestrian way: 10 feet;
(8) Where existing or anticipated traffic on primary and secondary thoroughfares warrants greater widths of right-of-way, these shall be required.
(J) Street grade. The grades in all streets, thoroughfares, collector streets, minor streets, and alleys in any subdivision shall not be greater than the maximum grades for each classification as follows:
(1) Primary thoroughfare: 5%;
(2) Secondary thoroughfare: 5%;
(3) Collector street: 5%;
(4) Minor street: 8%;
(5) Alley: 8%;
(6) In addition, there shall be a minimum grade on all streets and thoroughfares of not less than 1.0%.
(K) Horizontal alignment. The horizontal alignment standards on all streets shall be as follows:
(1) Radius center line:
(a) Major thoroughfare: 500 feet minimum;
(b) Secondary thoroughfare: 500 feet minimum;
(c) Collector street: 300 feet minimum;
(d) Minor street: 100 feet minimum;
(2) There shall be a tangent between all reversed curves of a minimum length as follows:
(a) Major thoroughfare: 100 feet minimum;
(b) Secondary thoroughfare: 100 feet minimum;
(c) Collector street: 50 feet minimum;
(d) Minor street: 30 feet minimum.
(L) Vertical alignment. All changes in street grades shall be connected by vertical parabolic curves of such length as follows:
(1) Primary thoroughfare or secondary thoroughfare: 300 feet minimum;
(2) Collector street or minor street: 100 feet minimum.
(M) Dedication of streets. All proposed streets shall be dedicated as public streets except where approved by the Planning Commission and City Council subject to the provisions in division (N) below.
(N) Private streets. The use of private streets are subject to the following:
(1) Be called trails;
(2) Have a minimum width of 28 feet;
(3) Concrete curb and gutter shall be provided. Curb and gutter design shall conform to the city's standard for either B style or M style, as recommended by city staff and/or approved by the City Council based on project-specific considerations; and
(4) Be subject to city design and inspection.
(O) Within all new residential subdivisions, the installation of a sidewalk is required on at least 1 side of any new residential street. The specifications for sidewalks are as follows:
(1) Minimum sidewalk width is 5 feet.
(2) Minimum sidewalk depth is 5 inches.
(3) Minimum Class 7 aggregate base or other crushed aggregate base of 5 inches.
(P) Sidewalks shall be installed in existing residential subdivisions as recommended in the Future Sidewalk Development Map.
(Q) Curb and gutter. Within all new subdivisions, the installation of concrete curb and gutter is required on both sides of all streets. Curb and gutter design shall conform to the city's standard for either B style or M style, with the following guidelines:
(1) M-style curb and gutter shall be used for all new streets that are functionally classified as local streets in predominantly single-family or multi-family residential areas.
(2) B-style curb and gutter shall be used for all new streets that are functionally classified as anything higher than local streets in predominantly single-family or multi-family residential areas.
(3) B-style curb shall be used on all new streets in predominantly commercial or industrial areas.
(4) Variations and interpretations to the curb and gutter design standards specified in divisions (Q)(1), (2) and (3) above may be made upon approval by the City Council upon recommendations provided by city staff in consideration of project-specific conditions.
(1975 Code, § 12.06, Subd. 2) (Am. Ord. 4, passed 3-2-1981; Am. Ord. 8, 4th Series, passed 1-16-2007; Am. Ord. 57, 4th Series, passed 5-5-2014; Am. Ord. 81, 4th Series, passed 9-19-2016)