A. Generally. The location, width and grade of streets shall be considered in their relation to existing and planned streets, to topographical conditions, to public convenience and safety, to the proposed use of land to be served by the streets and the public interest. The street system shall assure an adequate traffic circulation system with intersection angles, grades, tangents and curves appropriate for the traffic to be carried considering the terrain. Where location is not shown in a development plan, the arrangement of streets shall either:

B. Creation or Extension of Public Street Outside Subdivision:

C. Creation of Private Street Outside a Subdivision: A street which is created in order to allow the partitioning of land for the purpose of transfer of ownership or building development, whether immediate or future, shall be in the form of a street in a subdivision or as provided in B above, except that a private street to be established by deed without full compliance with these regulations shall be approved by the Planning Commission provided it is the only reasonable method by which the rear portion of an unusually deep land parcel of a size to warrant partitioning into not over two parcels may be provided with access. A copy of the tentative plan to create the street and partition the tract shall be submitted to the City at least fifteen days prior to the Planning Commission meeting at which consideration is desired. The document and such information as may be submitted shall be reviewed by the Planning Commission and, if assurance of adequate utility and vehicular access is indicated, shall be approved.

C. Minimum right-of-way and roadway width: Unless otherwise indicated on the development plan approved by the City, the street right-of-way and roadway widths shall not be less than the minimum width in feet shown in the following table and as illustrated in Section 730.120.

Local Skinny Street standards may only be utilized where maximum block length does not exceed 330 feet, or where the street is less than 2,400 feet in length and cannot be connected or extended.

E. Reserve strips: Reserve strips or street plugs controlling access to streets will not be approved unless necessary for the protection of the public welfare or of substantial property rights and in these cases they may be required. The control and disposal of the land comprising such strips shall be placed within the jurisdiction of the City under conditions approved by the Planning Commission.

F. Alignment: As far as is practical, streets other than minor streets shall be in alignment with existing streets by continuations of the center lines thereof. Staggered street alignment resulting in "T" intersections shall, wherever practical, leave a minimum distance of 200 feet between the center lines of streets having approximately the same direction and, in no case, shall be less than 100 feet.

G. Future Extensions of Streets: Where necessary to give access to or permit a satisfactory future division of adjoining land, streets shall be extended to the boundary of the subdivision or partition and the resulting dead-end streets may be approved without a turn-around. Reserve strips and street plugs may be required to preserve the objectives of street extensions. Stubbed streets shall be limited to 200 feet in length and have no more than 25 dwelling units. The street end shall be posted identifying it as the site for possible street extension when there is future development.

H. Intersection Angles: Streets shall be laid out to intersect at angles as near to right angles as practical except where topography requires a lesser angle, but in no case shall the acute angle be less than 80o degrees unless there is a special intersection design. An arterial or collector street intersecting with another street shall have at least 100 feet of tangent adjacent to the intersection unless topography requires a lesser distance. Other streets, except alleys, shall have at least 50 feet of tangent adjacent to the intersection unless topography requires a lesser distance. Intersections which contain an acute angle of less than 80o degrees or which include an arterial street shall have a minimum corner radius sufficient to allow for a roadway radius of 20 feet and maintain a uniform width between the roadway and the right-of-way line. Ordinarily, the intersection of more than two streets at any one point will not be approved.

I. Existing Streets: Whenever existing streets adjacent to or within a tract are of inadequate width, additional right-of-way shall be provided at the time of the land division.

J. Half Streets: Half streets, while generally not acceptable, may be approved where essential to the reasonable development of the development, subdivision or partition when in conformity with the other requirements of these regulations and when the Planning Commission finds it will be practical to require the dedication of the other half when the adjoining property is divided. Whenever a half street is adjacent to a tract to be divided, the other half of the street shall be provided within such tract. Reserve strips and street plugs may be required to preserve the objectives of half streets.

K. Cul-de-sac: In order to improve connectivity in the city, cul-de-sacs shall generally be prohibited. When environmental or topographical constraints or existing development patterns preclude local street connectivity, a cul-de-sac shall be as short as possible and shall have a maximum length of 200 feet (except for long narrow lots on Glisan Street where cul-de-sacs may not exceed 400 feet) and serve building sites for not more than 25 dwelling units. A cul-de-sac shall terminate with a circular turn-around.

L. Street Names: Except for extensions of existing streets, no street name shall be used which will duplicate or be confused with the name of an existing street. Street names and numbers shall conform to the established pattern in the City and shall be subject to the approval of the Planning Commission.

M. Grades and Curves: Grades shall not exceed six percent on arterials, ten percent on collector streets or 12 percent on other streets. Center line radii of curves shall not be less than 300 feet on major arterials, 200 feet on secondary arterials or 100 feet on other streets. Where existing conditions, particularly the topography, make it otherwise impractical to provide buildable sites, the Planning Commission may accept steeper grades and sharper curves. In flat areas, allowance shall be made for finished street grades having a minimum slope, preferably, of at least 0.5 percent.

N. Streets Adjacent to Railroad Right-of-Way: Wherever the proposed land division contains or is adjacent to a railroad right-of-way, provision may be required for a street approximately parallel to and on each side of such right-of-way at a distance suitable for the appropriate use of the land between the streets and the railroad. The distance shall be determined with due consideration at cross streets.

O. Marginal Access Streets: Where a land division abuts or contains an existing or proposed arterial street, the Planning Commission may require marginal access streets reverse frontage lots with suitable depth, screen planting contained in a non-access reservation along the rear or side property line, or other treatment necessary for adequate protection of residential properties and to afford separation of through and local traffic.

P. Alleys: Alleys may be provided in any zoning district, unless other permanent provisions for access to off-street parking and loading facilities are approved by the Planning Commission. The corners of alley intersections shall have a radius of not less than 12 feet.

Q. Sidewalks: Sidewalks shall be installed on all public streets adjacent to the proposed development. Planning Commission may recommend approval for development without sidewalks if a variance application is submitted, alternative pedestrian routes are planned or available, and if it can be shown that the proposed routes adequately provides for pedestrian circulation within, and connectivity to and from, the development. On local City streets, concrete sidewalks, planter strips or furnishing zones, and street trees shall be provided as shown in the cross-sections in the City Transportation System Plan. On County streets, sidewalks shall be provided in accordance with Multnomah County Street Standards and regional street design standards. In all cases, at least five feet shall be clear for through travel on sidewalks.

R. Multi-use pathways: Multi-use pathways shall be eight (8) feet wide, surfaced with asphalt, concrete, turf pavers, low-impact pavers, compacted gravel, engineered wood fiber, or other City approved materials to meet ADA standards. Pathways shall be located in a 20 foot wide public easement. Pathway width and easements or rights-of-way may be altered with the specific approval of the City if such pathway alternatives are constrained by existing right-of-way, easements, topography, and as specifically directed in the water quality resource area overlay zone Section 430 of this code. In all cases, at least five feet shall be clear for through travel on pathways.