156.081 Streets.
(A) General.
(1) 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 and to the proposed use of land to be served by the streets.
(2) 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.
(3) Where location is not shown in a development plan, the arrangement of streets shall either:
(a) Provide for the continuation or appropriate projection of existing principal streets in surrounding areas; or
(b) Conform to a plan for the neighborhood approved or adopted by the City Council to meet a particular situation where topographical or other conditions make continuance or conformance to existing streets impractical.
(B) Minimum rights-of-way widths.
(1) Street rights-of-way and improvements shall be the widths and standards listed in the Minimum Right-of-Way Widths Table below.
(a) A street design cross section for Eighth Street between H Street and Tohls Street is included in the City Downtown Transportation Plan.
(b) Cross-sections for city consideration on streets with 40-foot and 50-foot right-of-way widths are also included.
(2) The width of a required right-of-way shall be determined by the city based upon, but not limited to, the following factors:
(a) Street classification, if any, listed within the Comprehensive Plan, Downtown Transportation Plan and/or this chapter;
(b) Anticipated traffic generation;
(c) On-street parking needs;
(d) Sidewalk and bikeway requirements based on anticipated level of use;
(e) Requirements for placement of utilities;
(f) Street lighting;
(g) Minimize drainage, slope and sensitive lands impacts, as identified within Ch. 155, this chapter and Ch. 157 of this code of ordinances;
(h) Safety and comfort for motorists, bicyclists and pedestrians;
(i) Access needs for emergency vehicles;
(j) Street furnishings (e.g., benches, lighting, bus shelters and the like) when provided;
(k) Transition between different street widths (i.e., existing streets and new streets), as applicable; and
(l) Other relevant criteria.
(3) The City Council, Planning Commission and/or the City Manager/Recorder (where applicable) may require that a traffic study be completed, at the applicant’s expense, to justify one classification versus another.
(4) Right-of-way classifications, as used herein, shall be construed to mean the following:
(a) Arterial street. Carries most of the traffic through or into the city; provides access to the most intensive areas of the city, such as downtown;
(b) Collector street. Distributes traffic from arterial streets into residential streets and are intermediate in size, between arterial and residential streets;
(c) Residential street. Serves as direct access to abutting properties and are not intended to provide through traffic movements as do arterial and collector streets;
(d) Private street, alley. Serves 12 homes or less with no possibility of through traffic and with adequate turnarounds; street that is not intended, nor shall become a public street; and
(e) Driveway. A private lane that shall not serve more than two residential units. Additional units may require the conversion of the driveway to a private street or alley.
|
Minimum Right-of-Way Widths |
|||||
|---|---|---|---|---|---|
|
Classification |
Total ROW Width |
Curb-to-Curb Pavement Width* |
Travel Lanes* |
Parking Lanes* |
Sidewalks* |
|
Arterial |
60' |
40' |
12' |
8' |
6' |
|
Collector |
50' |
38' |
11' |
8' |
6* |
|
Driveway |
10' |
10' |
10' ** |
– |
- |
|
Private street, alley |
20' |
18' |
9' |
– |
- |
|
Residential |
40' |
32' |
9' |
7' |
4' |
|
30' |
25' |
9' |
7' ** |
4' |
|
|
NOTES TO TABLE: * Widths listed are minimum amounts and are for each lane and/or side. ** Width listed is for a single allowable lane. |
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(C) Street cross-sections.
(1) The final lift of asphalt or concrete pavement shall be placed on all newly constructed public roadways prior to final city acceptance of the roadway and within two months of the conditional acceptance of the roadway unless otherwise approved by the city.
(2) The final lift of all street construction shall also be placed before any structures in the new development are completed or within one year from the commencement of initial construction of the development, whichever is less.
(3) Construction standards.
(a) Rights-of-way, private streets, alleys or driveways shall be surveyed before construction starts.
(b) Application must be made to the city and a permit approved before construction starts.
(c) Clearing, leveling, grading and drainage shall be approved by the city’s Public Works Superintendent.
(d) Culverts shall be a minimum of 12 inches in diameter.
(e) Bank slopes at edges of rights-of-way shall not be steeper than one and one-half to one. If necessary, special slope easements may be required.
(f) Base rock source shall be approved by the city’s Public Works Superintendent.
(g) Base rock shall be eight inches depth, minimum.
(h) Surface material shall be of Class C or B asphaltic concrete.
(i) The final lift shall be Class C asphaltic concrete as defined by A.P.W.A. standard specifications.
(k) The city, county or state agency with jurisdiction may require additional and/or different standards than those listed here.
(j) No lift shall be less than two inches in thickness.
(D) Alignment.
(1) As far as is practical, streets other than minor streets shall be in alignment with existing streets by continuations of the centerlines thereof.
(2) Staggered street alignment resulting in “T” intersections shall leave a minimum distance of 150 feet between the centerlines of streets having approximately the same direction.
(E) Future street extension.
(1) Where necessary to give access to or permit a satisfactory future division of adjoining land, streets shall extend to the boundaries of the subdivision or partition if feasible and the resulting dead-end streets may be approved without a turn-around.
(2) Reserve strips including street plugs may be required to preserve the objective of street extensions.
(F) Intersection angles.
(1) Streets shall 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 80 degrees, unless there is a special intersection design or the corner radius is increased to allow for safe turning.
(2) An arterial or collector street intersecting with another street shall have at least 100 feet of tangent adjacent to the intersection unless topography or other unusual circumstances requires a lesser distance.
(3) Other streets, except alleys, shall have at least 50 feet of tangent adjacent to the intersection unless topography or other unusual circumstances requires a lesser distance.
(4) Intersections which contain an acute angle of less than 80 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.
(5) Ordinarily, the intersection of more than two streets at any one point will not be approved.
(G) 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.
(H) Half streets.
(1) Half streets shall be prohibited, except where essential to the reasonable development of the subdivision or partitions if they are in conformity with the other requirements of these regulations when the Planning Commission finds it will be practical to require the dedication of the other half when the adjoining property is divided.
(2) Whenever a half street is adjacent to a tract to be divided, the other half of the street shall be platted within the tract.
(3) Reserve strips may be required to preserve the objectives of half streets.
(I) Grades and curves.
(1) Grades shall not exceed 6% on arterials, 10% on collector streets or 12% on other streets.
(2) Centerline radii of curves shall be no less than 300 feet on major arterials, 200 feet on secondary arterials or 100 feet on other streets and shall be to an even ten feet.
(3) Where existing conditions, particularly the topography, make it otherwise impractical to provide buildable sites, the Planning Commission may accept steeper grades and sharper curves.
(4) In flat areas, allowance shall be made for finished street grades having a minimum slope of at least 0.5%.
(J) Street names. All street names shall be approved by the Planning Commission for conformance with the established pattern and to avoid duplication and confusion.
(K) Private streets.
(1) The design and improvement of any private street shall be subject to all requirements prescribed by this chapter for public streets.
(2) The land divider shall provide for the permanent maintenance of any street required for access to property in a private street subdivision or a major partition. (Ord. 80-3, passed 04/12/2004)