Chapter 16.20
DESIGN STANDARDS

Sections:

16.20.010    Harmony with map and general plan.

16.20.020    Basic considerations.

16.20.030    Large lots.

16.20.040    Reserve strips.

16.20.050    Streets – Arrangement – General considerations.

16.20.060    Streets – Arrangement – Conflicts with existing uses.

16.20.070    Streets – Major road frontage restrictions.

16.20.080    Streets – Through traffic discouragement.

16.20.090    Streets – Future systems.

16.20.100    Streets – Intersections – Number.

16.20.110    Alleys.

16.20.120    Streets – Grades.

16.20.130    Streets – Dead ends.

16.20.140    Streets – Half streets.

16.20.150    Streets – Vertical curves.

16.20.160    Streets – Alignment – Visibility.

16.20.170    Streets – Widths.

16.20.180    Streets – Curves.

16.20.190    Streets – Reverse curves.

16.20.200    Streets – Intersections – Angles.

16.20.210    Streets – Intersections – Grades.

16.20.220    Streets – Sub streets.

16.20.230    Streets – Names.

16.20.240    Blocks – Arrangement.

16.20.250    Blocks – Width.

16.20.260    Blocks – Residential.

16.20.270    Blocks – Business.

16.20.280    Blocks – Crosswalks.

16.20.290    Lots – Shape.

16.20.300    Lots – Dimensions.

16.20.310    Lots – Residential – Dimensions.

16.20.320    Lots – Street access.

16.20.330    Lots – Corner.

16.20.340    Lots – Side lines.

16.20.350    Lots – Double frontage.

16.20.360    Lots – Arterial street frontage.

16.20.370    Easements.

16.20.380    Public spaces.

16.20.390    Natural features.

16.20.400    Monuments.

16.20.010 Harmony with map and general plan.

Subdivisions shall, where practical, be in harmony with the official map and the general plan, if such exists. (Ord. 152 § 1, 1971; 1978 code § 15.107.1)

16.20.020 Basic considerations.

The commission will take into consideration the general requirements of the community, the particular requirements of the neighborhood, and the best use of the land to be subdivided. Particular attention may be given to specific requirements for parks, playgrounds, school sites, public building sites, major streets, sewer and water, and adequacy of street connections and the suitability of the land for development. (Ord. 152 § 1, 1971; 1978 code § 15.107.2)

16.20.030 Large lots.

If a tract is subdivided into larger parcels than ordinary building lots, such parcels shall be arranged to allow the opening of future streets and logical further subdivision. (Ord. 152 § 1, 1971; 1978 code § 15.107.3)

16.20.040 Reserve strips.

There shall be no reserve strips controlling access to land dedicated or intended to be dedicated to public use, except when the control and disposition of land comprising such strips are placed within the jurisdiction of the public under conditions specified by the commission and attached to the final plat. (Ord. 152 § 1, 1971; 1978 code § 15.107.4)

16.20.050 Streets – Arrangement – General considerations.

Arrangement, character, extent, width, grade and location of all streets shall be considered in relation to the general plan, to existing and planned streets, to topographic conditions, and in relation to the proposed uses of the land to be served thereby. (Ord. 152 § 1, 1971; 1978 code § 15.108.1)

16.20.060 Streets – Arrangement – Conflicts with existing uses.

Where a pattern is not shown on the general plan, or the pattern shown conflicts with existing property uses, the arrangement of streets in a subdivision shall either:

A. Provide for the continuation or appropriate projection of existing principal streets in surrounding areas at a width at least as great as such contained or projected streets; or

B. Conform to a plan for the neighborhood adopted by the commission to meet a particular situation where topographic or other conditions make continuance or conformance to existing or planned streets impractical. (Ord. 152 § 1, 1971; 1978 code § 15.108.2)

16.20.070 Streets – Major road frontage restrictions.

When a tract fronting on a major road for a distance of 500 feet or more and an average depth from the major road of more than 350 feet is to be subdivided into more than eight residential lots, the commission may require such residential lots adjoining the major road to be provided with frontage on a secondary or interior street. (Ord. 152 § 1, 1971; 1978 code § 15.108.3)

16.20.080 Streets – Through traffic discouragement.

Residential streets shall be so laid out that their use by through traffic will be discouraged. (Ord. 152 § 1, 1971; 1978 code 15.108.4)

16.20.090 Streets – Future systems.

Where the plat submitted covers only a part of the subdivider’s tract, a sketch of the prospective future street and utility system of the unsubmitted part shall be furnished, and the street and utility system of the submitted part shall be considered in the light of proposed plans for the entire area. (Ord. 152 § 1, 1971; 1978 code § 15.108.5)

16.20.100 Streets – Intersections – Number.

There shall be a minimum number of intersections of residential streets with arterial streets or major streets. (Ord. 152 § 1, 1971; 1978 code § 15.108.6)

16.20.110 Alleys.

Alleys of 20 feet minimum width shall be provided to the rear of all lots zoned for business purposes and shall not be provided in residential blocks, except where the commission requests for public safety and/or for possible future business use or the subdivider produces evidence satisfactory to the commission of the need for alleys. (Ord. 152 § 1, 1971; 1978 code § 15.108.7)

16.20.120 Streets – Grades.

Grades may not exceed eight percent unless limited by topography and approved by the council. (Ord. 152 § 1, 1971; 1978 code § 15.108.8)

16.20.130 Streets – Dead ends.

Streets designed to have one end permanently closed (dead-end streets) shall be no more than 400 feet long and shall be provided at the closed end with a suitable turnaround with a maximum radius of 45 feet to the property line. (Ord. 152 § 1, 1971; 1978 code § 15.108.9)

16.20.140 Streets – Half streets.

Whenever there exists a dedicated or platted half street or alley adjacent to the tract to be subdivided, the other half of the street or alley shall be platted or dedicated. (Ord. 152 § 1, 1971; 1978 code § 15.108.10)

16.20.150 Streets – Vertical curves.

All changes in street grades shall be connected by vertical curves of a minimum length equivalent to 20 times the algebraic difference in the rate of grade for arterial and collector streets and one-half of this minimum for all other streets. (Ord. 152 § 1, 1971; 1978 code § 15.108.11)

16.20.160 Streets – Alignment – Visibility.

Street jogs shall be discouraged on all but residential streets. Clear visibility, measured along the centerline, shall be provided for at least 600 feet on the arterial streets, 400 feet on collector streets, and at least 200 feet on all other streets. (Ord. 152 § 1, 1971; 1978 code § 15.108.12)

16.20.170 Streets – Widths.

The minimum right-of-way width of proposed streets shall be as follows:

Thoroughfare

150 feet

Primary highway

100 feet

Secondary highway

86 feet

Collector streets

60 feet

Business streets

60 feet

Residential streets

60 feet

(Ord. 625 § 3, 2004; Ord. 152 § 1, 1971; 1978 code § 15.108.13)

16.20.180 Streets – Curves.

Where a deflection angle of more than 10 degrees in the alignment of a street occurs, a curve of reasonably long radius shall be introduced. On streets 60 feet or more in width, the center line radius of curvature shall not be less than 300 feet; on other streets not less than 100 feet. (Ord. 152 § 1, 1971; 1978 code § 15.108.14)

16.20.190 Streets – Reverse curves.

Between reversed curves on all streets there should be a tangent at least 100 feet long where possible. (Ord. 152 § 1, 1971; 1978 code § 15.108.15)

16.20.200 Streets – Intersections – Angles.

Street intersections shall be as nearly at right angles as possible, and no intersection shall be at an angle of less than 45 degrees. (Ord. 152 § 1, 1971; 1978 code § 15.108.16)

16.20.210 Streets – Intersections – Grades.

Flat grades are preferred from 50 to 100 feet away from an intersection, but in no case shall grades exceed four percent for a distance of at least 100 feet from all intersections. (Ord. 152 § 1, 1971; 1978 code § 15.108.17)

16.20.220 Streets – Sub streets.

Streets which are sub streets designed to provide future connection with adjoining unsubdivided areas must provide some type of temporary turn-around at the sub end. (Ord. 152 § 1, 1971; 1978 code § 15.108.18)

16.20.230 Streets – Names.

Streets shall be named in such manner as to conform to adjacent areas, and particular attention shall be given to avoid duplication. (Ord. 152 § 1, 1971; 1978 code § 15.108.19)

16.20.240 Blocks – Arrangement.

The length, width and shapes of blocks shall be determined with due regard to the special needs of the type of use contemplated; to needs for convenient access and circulation; to topography; and to the conservation of building sites. (Ord. 152 § 1, 1971; 1978 code § 15.109.1)

16.20.250 Blocks – Width.

Blocks shall be wide enough to allow two tiers of lots of minimum depth, except where fronting on major streets or prevented by topographical conditions or size of the property, in which case the commission may approve a single tier of lots of minimum depth. (Ord. 152 § 1, 1971; 1978 code § 15.109.2)

16.20.260 Blocks – Residential.

Blocks planned for residential use shall not exceed 1,000 feet nor be less than 300 feet in length. (Ord. 152 § 1, 1971; 1978 code § 15.109.3)

16.20.270 Blocks – Business.

Blocks planned for business use shall not exceed 600 feet nor be less than 300 feet in length. (Ord. 152 § 1, 1971; 1978 code § 15.109.4)

16.20.280 Blocks – Crosswalks.

Pedestrian crosswalks not less than eight feet wide may be required in blocks longer than 600 feet where deemed essential to provide reasonable circulation or access to schools, playgrounds, shopping centers, transportation or other community facilities. (Ord. 152 § 1, 1971; 1978 code § 15.109.5)

16.20.290 Lots – Shape.

The shape of lots and their orientation shall be appropriate to the location of the proposed subdivision and to the type of development contemplated. (Ord. 152 § 1, 1971; 1978 code § 15.110.1, 15.110.7)

16.20.300 Lots – Dimensions.

Varying dimensions of lots are recommended, but the minimum dimensions of lots for residential use shall be 60 feet in width at the property line and 120 feet in depth. In areas where no public sewage disposal system is available, the lots shall be large enough to afford the construction of septic tanks and seepage pits in accordance with the regulations and specifications of the Alaska Department of Health. (Ord. 152 § 1, 1971; 1978 code § 15.110.2)

16.20.310 Lots – Residential – Dimensions.

Lots to be used primarily for residential purposes must contain a minimum of 7,200 square feet. (Ord. 152 § 1, 1971; 1978 code § 15.110.3)

16.20.320 Lots – Street access.

Each lot shall abut on a dedicated street. (Ord. 152 § 1, 1971; 1978 code § 15.110.4)

16.20.330 Lots – Corner.

The minimum dimensions of a corner lot shall be at least 65 feet in width. (Ord. 152 § 1, 1971; 1978 code § 15.110.5)

16.20.340 Lots – Side lines.

Side lines of lots shall be approximately at right angles or radial to the street line. (Ord. 152 § 1, 1971; 1978 code § 15.110.6)

16.20.350 Lots – Double frontage.

Double frontage lots, other than corner lots, will be permitted only under unusual conditions. (Ord. 152 § 1, 1971; 1978 code § 15.110.8)

16.20.360 Lots – Arterial street frontage.

A. Where a new subdivision involves frontage on an arterial street, lots fronting on said arterial street must conform to the following requirements unless marginal access streets are provided:

1. The lots must be at least 20 percent deeper than the average lot in the subdivision.

2. An alley along the rear of the lots must be provided to offer access to the lots.

B. The commission recommends that all drives enter from said alley to ensure more safety to the property owners and increase the traffic capacity of the arterial streets. (Ord. 152 § 1, 1971; 1978 code § 15.110.9)

16.20.370 Easements.

Rights-of-way or easements at least 20 feet wide and 10 feet on each side of the rear or side property lines of lots, together with the right of ingress and egress thereto and therefrom, shall be provided where necessary for public utilities; likewise, an anchor pole easement 10 feet wide, 25 feet deep appropriately placed, together with the right of ingress and egress thereto and therefrom, shall be provided where necessary for public utilities. (Ord. 152 § 1, 1971; 1978 code § 15.111.1)

16.20.380 Public spaces.

Due consideration should be given to the allocation of suitable areas for schools, parks, playgrounds, and other areas to be dedicated for public use or reserved for future acquisition by a public body. (Ord. 152 § 1, 1971; 1978 code § 15.111.2)

16.20.390 Natural features.

Outstanding natural and cultural features such as scenic spots, watercourses and historic sites shall be reserved insofar as possible. (Ord. 152 § 1, 1971; 1978 code § 15.111.3)

16.20.400 Monuments.

PMC 16.16.030 shall be applicable to this section. (Ord. 152 § 1, 1971; 1978 code § 15.112)