[HISTORY: Adopted by the Village Board of the Village of Grafton as Title 18, Ch. 18.20, of the 1979 Code. Amendments noted where applicable.]
The proposed subdivision shall conform to:
The provisions of Chapter 236 of the Wisconsin Statutes, which are adopted by reference;
All applicable ordinances of the Village;
Design and construction standards as established by the Village;
The Comprehensive Plan of the Village;
The Official Map of the Village;
The rules of the State Department of Transportation, as may be promulgated from time to time, whenever in the opinion of that Department the proposed subdivision abuts existing or proposed state trunk highways or connecting streets, and for the preservation of the public interest and investment in such highway or street.
The streets shall be designed and located in relation to existing and planned streets, to reasonable circulation of traffic within the subdivision and adjoining lands, to topographical conditions, to runoff of stormwater, to public convenience and safety, in their appropriate relations to the proposed uses of the area to be served.
The arrangement, character, extent, width, grade and location of all streets shall conform to the Official Map and to the street and highway widths established by ordinance.
Major streets shall be properly integrated with the existing and proposed system of major streets and highways and, insofar as practicable, shall be continuous and in alignment with existing, planned or platted streets with which they are to connect.
Collector streets shall be properly related to the mass transportation system, to special traffic generators such as schools, churches and shopping centers, and to the major streets into which they feed.
Minor streets shall be designed to reasonably conform to the topography, to discourage use by through traffic, to permit efficient storm and sanitary sewerage systems, and to require the minimum street area necessary to provide safe and convenient access to abutting property. Minor street locations and street grades shall be established wherever practicable in such a manner to avoid excessive grading and to avoid the excessive removal of tree growth and general leveling of the topography.
Proposed streets shall be extended to the boundary lines of the tract to be subdivided, unless prevented by topography or other physical conditions, or unless in the opinion of the Plan Commission such extension is not necessary or desirable for the coordination of the layout of the subdivision or for the advantageous development of the adjacent tracts.
Wherever the proposed subdivision contains or is adjacent to a railroad right-of-way or limited access highway, provisions shall be made on each side of such right-of-way for streets approximately parallel to and at a distance suitable for appropriate use of the land and between such streets and the right-of-way, but not less than 150 feet. Such distance, where desirable and practicable, shall be determined with due consideration of the minimum distance required for the future separation of grades by means of appropriate approach gradients.
Provision shall be made for serving lots of residential use abutting major streets and highways by either the use of: a) marginal access streets; b) backing lots to the primary street with a screen planting contained in a nonaccess reservation along the rear property line; c) deeper lots fronting on the primary street with rear service alleys. These methods are recommended for the purpose of providing adequate protection of residential properties and to afford separation of through and local traffic.
[Amended by Ord. No. A-002-91, 1991; Ord. No. 020-94, 1994; Ord. No. 020, Series 2006; Ord. No. 002, Series 2018]
The right-of-way and roadway width shall be of the widths specified on the Official Map or Master Plan, or if no widths are specified there, they shall be the widths specified below:
[Amended at time of adoption of Code (see Ch. 1.01, Code Adoption)]
The grade of major and collector streets shall not exceed 6%, and the grade of other streets shall not exceed 10%, unless necessitated by exceptional topography and approved by the Plan Commission. The minimum grade of all streets shall be no less than 1/2% and shall not be permitted for long sustained distances. Grades of pedestrianways or crosswalks shall not exceed 15% unless steps of an acceptable design are to be constructed.
Where there is a section in horizontal center lines within a given block at any given point in excess of 10°, a curve shall be inserted with a radius of not less than:
[Amended by Ord. No. A-456-84, 1984]
Different connecting street gradients shall be connected with vertical parabolic curves. Minimum length in feet of these curves shall provide a stopping sight distance of not less than 200 feet. All changes in street grades shall be connected by vertical curves of a minimum length equivalent in feet to 30 times the algebraic difference in the rates of grade for streets, provided that no curve of less than 50 feet in length need be used.
Tangents of at least 100 feet in length shall be introduced between reverse curves on major and collector streets.
New street names shall not duplicate the names of existing streets, but streets that are continuations of others already in existence and named shall bear the names of the existing streets.
[Amended by Ord. No. A-003-91, 1991]
Cul-de-sac streets shall be not more than 700 feet in length measured along their center lines from the streets of origin to the ends of their right-of-way, unless specifically permitted by Plan Commission approval. Each cul-de-sac shall have terminus of nearly circular shape with the minimum right-of-way diameter being 120 feet and the minimum outside curb diameter of 90 feet.
Where a half street exists adjacent to the subdivision the other half of the street shall be dedicated by the subdivider. Platting of new half streets along property lines shall not be permitted except by approval of the Plan Commission.
Reserve strips controlling access to streets shall be prohibited except where their control is definitely placed in the Village under conditions approved by the Plan Commission.
Streets shall intersect as nearly as possible at right angles and not more than two streets shall intersect at one point unless approved by the Plan Commission.
Street jogs with center-line offsets of less than 125 feet shall be avoided. Where streets intersect major streets, their alignment shall be continuous.
Alleys shall be provided in all commercial and industrial districts, except that the Plan Commission may waive this requirement where other definite and assured provision is made for service access, such as off-street loading and parking consistent with and adequate for the uses proposed.
Alleys shall not be approved in residential areas unless necessary because of topography, necessary to provide for the separation of through and local traffic for residential land uses abutting major streets and highways, or other exceptional circumstances.
The width of the right-of-way for residential alleys shall be not less than 24 feet, and the width of the right-of-way for commercial and industrial alleys shall be not less than 32 feet.
Dead-end alleys are prohibited except under very unusual circumstances, and crooked and "T" alleys shall be discouraged. Where dead-end alleys are unavoidable, they shall be provided with adequate turnaround facilities at the dead end.
[Amended by Ord. No. 022, Series 2000]
Easements shall be provided for any overhead or underground utility service, including storm sewers or stormwater drainage and detention where necessary. Public utility easements shall be a minimum of 12 feet wide, six feet of same being on each of the adjacent lots or all 12 feet on one lot where necessary, except where wider easements are required by the Village Engineer. Easements shall be established at the rear of each lot and along such other lot lines as to provide continuity or alignment from block to block. At deflection points in these easements, if overhead utility lines are contemplated, additional easements shall be established for pole-line anchors. Where a subdivision is traversed by a watercourse, drainageway, channel or stream, there shall be provided a stormwater easement or drainage right-of-way conforming substantially with the lines of such watercourse and such further width or construction, or both, as will be adequate for the purpose. Wherever possible, it is desirable that the drainage be maintained by an open channel with landscaped banks and adequate width for maximum potential volume of flow.
The maximum block lengths in residential areas shall not exceed 1,800 feet. The minimum block lengths shall be 900 feet unless approved by the Plan Commission. The minimum distance between parallel street center lines shall be 286 feet.
No specific rule concerning the shape of blocks is made, but blocks must fit readily into the overall plan of the subdivision, and their design must evidence consideration of topographical conditions, surface drainage, lot planning, traffic flow, public open-space areas and water and sewerage requirements.
Blocks intended for commercial, industrial and institutional use must be designated as such, and the plan must show adequate off-street areas to provide for parking, loading docks and such other facilities as may be required to accommodate motor vehicles.
Pedestrian crosswalks not less than 12 feet wide may be required by the Plan Commission where deemed desirable to provide convenient pedestrian circulation or access to schools, playgrounds, shopping centers, transportation and other community facilities.
The size, shape and orientation of lots shall be appropriate for the location of the subdivision and for the type of development and use contemplated. In the subdividing of any land, due regard shall be shown for all natural features such as tree growth, watercourses, historic spots or similar conditions.
Width and area of lots shall conform with lot width and area requirements set forth in the Zoning Ordinance and in no case shall a lot in a residential district have less than a minimum width of 70 feet at the minimum building setback line and a minimum area of 8,000 square feet.
[Amended by Ord. No. 022, 2000]
Depth of lots shall be in accordance with Plan Commission requirements, but residential lots shall be not less than 110 feet in depth for interior lots and 90 feet in depth for corner lots.
Depth and width of properties reserved or laid out for commercial and industrial purposes shall be adequate to provide for the off-street service and parking facilities required by the type of use and development contemplated.
Residential lots abutting on major streets and highways shall be platted with sufficient depth to permit adequate separation between the buildings and such trafficways.
Butt lots shall be platted at least five feet wider than the average interior lots in developments containing lots less than 12,000 square feet in area.
Lots abutting upon a watercourse, drainageway, channel or stream shall be an additional depth or width as required to provide an acceptable building site.
Excessive depth in relation to width of lots shall be avoided. A proportion of two to one shall normally be considered as a desirable maximum for lot widths of 80 feet or more.
Corner lots shall be designed to permit full setback on both streets as required by the applicable zoning district requirements.
[Amended by Ord. No. 022, Series 2000]
Every lot shall front or abut on a dedicated public street right-of-way for a minimum of 40 feet along cul-de-sac bulbs and 60 feet along all other street segments. Lots with an access only to private drives or streets shall be permitted only with Plan Commission approval.
Side lot line shall be substantially at right angles or radial to street lines.
Where lots are created of a size larger than normal for the area, the Plan Commission may require that the plat be so designed as to allow for the possible future resubdivision of such lots into normal sizes compatible with the area.
Lots shall follow municipal boundary lines whenever practicable rather than cross them.
Double frontage and reversed frontage lots shall be avoided except where necessary to provide separation of residential development from traffic arteries or to overcome specific disadvantages of topography and orientation.
[Amended by Ord. No. A-007, 1992]
Sidewalks shall be provided within a subdivision in accordance with Title 11, Streets, Sidewalks and Public Places, of the Code of the Village of Grafton and/or plans approved by the Village Plan Commission along with the subdivision plat.
Five-foot-wide concrete sidewalks shall normally be constructed on one side of all frontage and both sides of all streets within developments.
Sidewalks must be constructed along streets if they provide a link between developments or link developments with support facilities such as schools, shopping centers, employment centers, parks and other public recreational facilities.
The Plan Commission may exempt the following streets from sidewalk construction: residential culs-de-sac, loop streets (eyebrows) or dead-end streets serving eight or fewer residences and less than 400 feet in length; commercial or industrial streets that provide access only to businesses within the immediate area. The Commission may allow the construction of sidewalks on only one side of all other culs-de-sac and dead-end streets.
Sidewalk construction shall be in accordance with plans submitted by the developer along with subdivision street plans and profiles. In addition, wider than standard sidewalks may be required by the Plan Commission in the vicinity of schools, commercial areas and other places of public assemblage.
Pedestrian trails. Pedestrian trails may be allowed or required in lieu of or in addition to sidewalks within duplex, multifamily and planned developments. Such trails shall be constructed of bituminous asphalt materials and shall be at least five feet wide. Where such trails are also to be used as bikeways, they shall be a minimum of eight feet wide. Such trails may be allowed in lieu of sidewalks when, due to unique subdivision design and/or terrain, they will provide a more convenient link between the subdivision with schools, shopping centers, employment centers and/or amenities.