Chapter 16.29
DESIGN STANDARDS
Sections:
16.29.020 Street and block layout.
16.29.030 Street right-of-way requirements.
16.29.010 Generally.
A. Land which the planning commission may find to be unsuitable for subdivision due to flooding, bad drainage, excessive slopes, rock formations, high ground water, or other features likely to be harmful to the safety and general health of the future residents, and which the planning commission considers inappropriate for subdivision, shall not be subdivided, unless adequate corrective methods approved by the city engineer are provided.
B. The proposed subdivision shall include such requirements as are required by the city street and utility standards, ordinances, resolutions, and comprehensive plans. (Ord. 1017-A § 2, 2005).
16.29.020 Street and block layout.
A. Street layout shall conform to the most advantageous development of subdivision, adjoining areas, and the entire neighborhood, and shall provide for the following:
1. Continuity of appropriate streets and arterials.
2. Streets to boundaries of tract.
3. Streets generally following contour lines.
4. Streets intersecting at right angles or as nearly as possible and T-intersection design shall be utilized in so far as practical.
5. All streets dedicated shall be full width except along the boundary lines of the plat. Half width streets may be accepted where the planning commission approves the development of the street location on boundaries of the subdivision.
6. Alleys shall be a minimum of 20 feet wide. Alleys may be required in residential areas and to service all properties abutting arterials. Alleys may be required in all commercial and industrial areas.
7. Utility easements will be permitted in lieu of alleys for property not adjacent to arterials in residential areas. Fire hydrants and water mains must be located on rights-of-way in these areas. Sewer mains, located in easements (such as an alley) which cross a street between easements, shall provide a manhole or clean out at each right-of-way crossing. The termination or end of the sewer main shall be located in the right-of-way and a manhole shall be provided at the terminus point. An access easement 10 feet wide shall be located from right-of-way to utility easement at each manhole location within the block. The width of utility easements shall be determined by the city engineer.
B. Where possible, blocks shall have sufficient width to provide for two tiers of lots, each of which shall have a minimum depth of 100 usable feet.
1. The length of blocks shall not exceed 1,320 feet where the average size of lots does not exceed two acres in area.
2. Paved crosswalks or pedestrian ways may be required, when essential to provide circulation or access to schools between rights-of-way, playgrounds, shopping centers, etc., the right-of-way of which shall be at least 10 feet in width.
3. The number of intersecting streets with major arterials of all classes shall be held to a minimum. (Ord. 1017-A § 2, 2005).
16.29.030 Street right-of-way requirements.
A. The minimum requirements for right-of-way, curb to curb pavement widths, curve radii, curve tangent lengths, sidewalk widths, sight distance and maximum grades of all rights-of-way improvements shall be determined by the following table, unless otherwise approved by the city engineer:
|
|
Minimum Right-of-Way Widths (feet) |
Minimum Curb to Curb Pavement Widths (feet) |
Minimum Curvature (feet, radius) |
Minimum Tangent Lengths (feet) |
Minimum Sidewalk Widths (feet) |
Minimum Sight Distance |
Maximum Grades Percent |
|
I. Community Arterials |
|||||||
|
Freeways and Boulevards |
100 |
48 |
300 |
200 |
8 |
500 |
6 |
|
Major Arterials |
80 |
48 |
300 |
200 |
8 |
500 |
6 |
|
II. Neighborhood Arterials |
|||||||
|
Parkways, Park Drives, and Boulevards |
80 |
48 |
200 |
150 |
5 |
400 |
8 |
|
Minor Arterials |
60 |
40 |
200 |
150 |
5 |
400 |
8 |
|
III. Residential Streets |
|||||||
|
Local Streets |
60 |
36 |
100 |
100 |
5 |
300 |
10 |
|
Streets Limited to 500 Feet or Less in Length |
60 |
36 |
100 |
100 |
5 |
300 |
10 |
|
Cul de Sac |
80 |
60 |
|
|
5 |
250 |
6 |
B. Dead-end streets may be permitted where the proposed dead-end street will not adversely affect the traffic flow and circulation within the area. Dead-end streets shall terminate in a circular turn around at least 80 feet in diameter.
C. Alleys or easements for utilities may be required along rear or side lot lines and shall have a total width of 20 feet as required.
D. At street intersections property line corners shall be rounded by an arc, the radius of which shall be 10 feet minimum.
E. Street pavement centerlines shall coincide with the right-of-way centerlines where practical. (Ord. 1017-A § 2, 2005).
16.29.040 Lots.
A. Every lot shall abut on a dedicated public street except as provided for in residential unit development.
B. Lots shall be a minimum of 100 usable feet in depth.
C. Lots shall be a minimum of 65 feet in width at the front building lines in residential areas. Lots in other zones shall have a minimum of 50 feet of usable width.
D. The ratio of the depth of any lot to its width shall not be greater than three to one.
E. Residential lots shall have a minimum area of 7,000 square feet unless otherwise specified.
F. Corner lots shall be a minimum of 70 feet in width, and 10 percent greater area than minimum required.
G. Residential lots fronting on community arterials shall be at least 120 feet in depth.
H. Side lot lines shall be within 20 percent of perpendicular to the front property line with which it intersects.
I. Side and rear lot lines shall be straight, or composed of straight line elements.
J. Lots shall be subdivided in conformity to requirements of the zoning ordinance in effect at time of subdividing. (Ord. 1017-A § 2, 2005).
16.29.050 Street lighting.
All new subdivisions shall be required to allow for and install street lighting circuitry in accordance with plans and specifications prepared by the Grant County public utility district and approved by the city engineer.
A. It shall be the responsibility of the subdivider, in conjunction with the PUD, to provide circuitry for all required street lighting to be located in the proposed subdivision.
B. The Grant County PUD shall prepare a street lighting plan for the new subdivision. All plans and specifications must be approved by the city engineer prior to installation of said lighting circuitry. (Ord. 1017-A § 2, 2005).