City of Belgrade Subdivision Regulations

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SECTION 7: DESIGN AND IMPROVEMENT STANDARDS, ROADS

  1. General Design
  2. Road Dedication
  3. Intersections
  4. Names
  5. Definitions and Design Standards
  6. Primary Access Road Standards
  7. Lot Access
  8. Paving Requirements
  9. Road Impact Fees

  1. General Design.

    1. Roads: The arrangement, type, extent, width, grade, and location of all roads shall be considered in their relation to existing and planned roads, to topographical conditions, to public convenience and safety, and to the proposed uses of the land to be served by such roads.

    2. Relation to Un-Subdivided Areas: When a new subdivision adjoins un-subdivided land and access to the unsubdivided land must pass through the new subdivision, the subdivider shall provide rights-of-way and construct roads so as to allow suitable access to the un-subdivided land.

      This requirement may be waived by the Public Works Department if one of the following criteria is met:

      1. Topography or other physical condition would make it impracticable to provide access to adjacent unsubdivided property.
      2. Adequate public access is otherwise available to the adjacent un-subdivided properties.
      3. When the adjoining un-subdivided property is under a conservation easement, public ownership, or other legally restrictive covenants.


      The Public Works Department must review and approve all proposed waivers.

    3. Relation to Subdivided Areas: The subdivider shall arrange the roads to provide for the continuation of roads between adjacent subdivided properties when such continuation is necessary for the convenient movement of traffic, effective provision of emergency service, and efficient provision of utilities.

    4. Separation of Through and Local Traffic: Where a subdivision abuts or contains an existing or proposed arterial or collector road, the subdivider may be required to provide frontage roads, reverse frontage with a reservation prohibiting access along the rear property line, screen planting, or such other treatment as may be necessary for protection of residential properties and to afford separation of through and local traffic.

    5. Distance Between Parallel Rights-Of-Way: Where a subdivision borders on or contains a railroad, limited access highway, canal, ditch, or stream right-of-way, the subdivider may be required to provide a road approximately parallel to an on each side of such right-of-way at a distance suitable to allow for the appropriate use of the intervening land. Such distances shall also be determined with due regard for the requirements of approach grades and future grade separation.

    6. Dead-End Roads: No dead-end roads shall be permitted without an approved turn around. Where streets terminate, the subdivider shall provide either a cul-de-sac or "T" turnaround at the terminus. Cul-de-sacs and "T" turnarounds must conform to the design specification of Table 1. Where it is planned that a dead-end road will be extended in the future, a temporary cul-de-sac or "T" turnaround shall be provided.

      "T" turnarounds shall include two straight backup lengths of thirty feet (30’) each, shall have an inside turning radius of twenty-six feet (26’), and shall have an outside turning radius of thirty-eight feet (38’).

    7. Half Roads: Half roads may be permitted only when it is shown they are beneficial to the City and are approved by the Public Works Department.

    8. Second or Emergency Access: To facilitate traffic, the provision of emergency services, and the placement of utility easements, the subdivider shall provide all subdivisions with six or more lots with a second means of access. If, in the judgment of the Council, a second dedicated right-of-way cannot be provided for reasons of topography or other physical conditions, the subdivider shall provide an emergency access, built to the standards in these Regulations. The subdivider may be required to provide a second or emergency access for minor subdivisions if the maximum cul-de-sac length standard is exceeded or if topography or physical conditions so warrant.

    9. Road Design Standards, General: The design standards contained in these Regulations shall apply to all construction, reconstruction, and paving of roads dedicated to the public or within the City maintained road system, and to roads improved through the special improvement district process. The variance procedure and standards of these Regulations shall apply to the above roads.

    10. Bridges: Bridges shall be provided and installed by the subdivider where drainage channels intersect any road rights-of-way.

      1. Bridges shall be built to H2O load standards and approved by the Public Works Department.

    11. Culverts: Culverts shall be provided and installed by the subdivider where drainage channels intersect any road rights-of-way.

      1. All culverts shall, at a minimum, extend across the entire improved width of the road cross section. The size and length of the culvert and the amount of backfill over the culvert shall be determined by a registered engineer, when determined necessary by the Public Works Department.

      2. Each culvert or other drainage facility shall be large enough to accommodate potential runoff from upstream drainage areas. The minimum capacity of a culvert shall be equivalent to a circular diameter of fifteen inches (15”).

    12. Encroachment Permits: The subdivider shall be required to obtain encroachment permits for all access to county roads and state highways.

  2. Road Dedication. All roads within or providing access to the proposed subdivision shall be dedicated to the public or, if the criteria of this Section are met, be a public road easement. Roads dedicated to the public are accepted for public use.

    1. The easement shall be approved by the City Attorney.

    2. The easement shall be recorded with the Clerk and Recorder.

    3. The easement shall clearly grant to the public an unrestricted right of ingress and egress from a public road to the property to be subdivided.

    4. Documented proof of maintenance of the easement must be provided.

  3. Intersections. The following requirements apply to road intersections:

    1. The intersection of more than two roads at one point shall be avoided.

    2. Roads shall be laid out so as to intersect as nearly as possible at right angles and no road shall intersect any other road at less than a seventy-five degree (75?) angle.

    3. Two roads meeting a third road from opposite sides shall meet at the same point, or their centerline shall be off-set at least two hundred feet (200’).

  4. Names. The following requirements apply to road names.

    1. New roads aligned with existing roads shall have the same name as the existing roads.

    2. All road names must be approved by the Public Works Department prior to preliminary plat approval in order to avoid duplication and confusion with names of existing roads.

  5. Definitions and Design Standards.

    1. Arterial Roads: An arterial is a road having the primary function of moving traffic with emphasis on a high level of mobility for through movement and the secondary function of providing limited access to adjacent land. Generally, arterials are secondary state highways. Primary and community arterial roads shall have a minimum eighty feet (80’) wide right-of-way and meet such other design standards as may be required by the Council.

    2. Major Collectors: Roads that carry more than three hundred (300) trips per day. Has the equally important functions of moving traffic and providing access to adjacent land. (See Table 1 for standards.)

    3. Minor Collectors: Roads which carry more than one hundred (100) trips per day but less than three hundred (300) trips per day. Has the equally important functions of providing access to adjacent land and moving traffic. (See Table 1 for standards.)

    4. Minor Roads: Local roads, which carry less than one hundred (100) trips per day. The primary function of a minor road is to serve abutting property, with a secondary function of moving traffic. (See Table 1 for standards.)

    5. Non Mountainous Roads: Roads not located on mountainous terrain. Mountainous terrain has a cross slope exceeding fifteen percent (15%).

    6. Mountainous Roads: Roads located on mountainous terrain. Mountainous terrain has a cross slope exceeding fifteen percent (15%).

    7. Primary Access: The major access to a subdivision. The major access generally carries the most traffic as determined by the traffic engineering study.

  6. Primary Access Road Standards. All off-site roads providing primary access to the proposed subdivision shall meet the following standards:

    1. Right-of-way width and construction standards contained in this Regulation shall apply.

    2. Access roads shall be dedicated to the public, or shall have a public easement, which meets the criteria of this Regulation.

    3. Primary access roads and interior subdivision roads shall be paved. Paving shall be done in accordance with the standards in these Regulations and the City of Belgrade Specifications (appendix A).

  7. Lot Access.

    1. Lot Access Standards: Lot accesses shall comply with the Belgrade Zoning Ordinance.

  8. Paving Requirements. All roads within shall be built to the paving standards in these Regulations and the City of Belgrade Specifications (appendix A) and in accordance with the timing requirements below. Trips per day will be calculated based on an average of eight trips per day per household.

    1. Timing Requirements: The subdivider shall meet one of the following requirements for completion of paving. The option shall be specified in the preliminary plat submittal. If option (b) is chosen, the subdivider shall enter into an improvement agreement as set forth below:

      1. The subdivision roads shall be paved prior to final plat approval; or

      2. Paving shall be completed within three years of the date of final plat approval of the subdivision, or within one year of homes being built on fifty percent (50%) of the lots within the subdivision, whichever occurs first.

    2. Paving Improvement Agreements: The purpose of improvement guarantees is to insure the paving requirements of this Section are met.

      1. If timing requirement (b) is chosen, the Council shall require an improvements agreement as a condition of final plat approval. The improvements agreement shall meet the following standards:

        (1) The length of time of the agreement shall not exceed three years from the date of final plat approval.
        (2) Security in the amount equal to one hundred twenty-five percent (125%) of the cost of the paving shall be included. Such security shall be in the form of a certificate of deposit, letter of credit, cash, or other reasonable security approved by the Council.
        (3) The required security shall not be reduced or paid out until all paving requirements are met.
        (4) The agreement and security shall be satisfactory to the City Attorney as to form and manner of execution.

      2. The subdivider shall do either of the following to meet the paving requirement:

        (1) Pave according to the requirements of these Regulations.; or
        (2) Initiate a Special Improvement District (SID) to meet the paving requirements of these Regulations. If the SID fails, the subdivider shall comply with the Section above.
  9. Improvement Standards.

    1. Road Construction Standards: All roads shall meet the following standards and standards contained in appendix A. Any deviation from these standards must be designed by a licensed engineer and approved by the City Engineer and the Public Works Department.

      TABLE 1.
      STREET DESIGN STANDARD

      TABLE 1.
      MAJOR/MINOR COLLECTORS
      MINOR ROADS
      TERRAIN*
      ORDINARY
      MOUNTAINOUS
      ORDINARY
      MOUNTAINOUS
      RIGHT-OF-WAY WIDTH
      60'-100'
      ---
      60'
      ---
      CENTERLINE RADIUS ON CURVES
      300'
      ---
      150'
      ---
      TANGENT LENGTH BETWEEN REVERSE CURVES
      100'
      ---
      50'
      ---
      STOPPING SITE DISTANCE
      300'
      ---
      200'
      ---
      ANGLE OF INTERSECTING CENTERLINES
      75*
      ---
      75*
      ---
      CURB RADIUS AT INTERSECTIONS
      25'
      ---
      15'
      ---
      LENGTH OF CUL-DE-SAC
      ---
      ---
      1000'**
      ---
      OUTSIDE RADIUS ON CUL-DE-SAC R.O.W.
      ---
      ---
      50'
      ---
      GRADE - MAXIMUM
      7%
      ---
      10%
      ---
      GRADE - MINIMUM
      .5%
      ---
      .5%
      ---
      MAXIMUM GRADE WITHIN 150' OF INTERSECTING CENTERLINES
      3%
      ---
      ---
      MAXIMUM GRADE WITHIN 75' OF INTERSECTING CENTERLINES
      ---
      3%
      ---



      Note: All standards are minimum standards unless noted.
      *Mountainous terrain is defined as terrain that has a cross slope exceeding 15%.
      **Cul-de-sac roads that provide access to unsubdivided land may exceed this length.
      ***Grades of over 10% shall not exceed 100' in length.



      TABLE 2.
      PAVING AND STREET WIDTH STANDARDS

      ADT
      FINISHED GRAVEL WIDTH
      PAVING WIDTH
      NON-MOUNTAINOUS TERRAIN
      8
      ---
      28’
      16
      ---
      28’
      24
      ---
      28’
      32-99
      ---
      28’
      100+
      ---
      28’
      MAJOR COLLECTORS & ARTERIALS
      ---
      As approved by
      the Council.


    2. Road Signs: Road signs of the size, shape, and height as approved by the Public Works Department, shall be placed at all intersections by the subdivider.

    3. Road Sign Standards: Location of road signs shall be designated on road plans, which are submitted for review and approval.
      1. Posts. See the City of Belgrade Specifications (appendix A).
      2. Signs. See the City of Belgrade Specifications (appendix A).