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All streets in the city, unless otherwise specified in this Code, shall be designed to the standards in Table 1 of this section and as follows:

(A) Minimum Required Right-of-Way Width.

(1) Principal and minor arterial streets and highways as indicated by city standards but, in any event, no less than one hundred (100) feet or as required by the Arizona Department of Transportation standards.

(2) Collector streets as indicated by current city standards but, in any event, no less than eighty (80) feet.

(3) Local streets as indicated by current city standards but, in any event, no less than fifty (50) feet, unless otherwise specified in this Code.

(a) Cul-de-sac streets shall terminate in a circular right-of-way fifty (50) feet in radius with a minimum improved traffic turning circle forty (40) feet in radius. The planning and zoning director may approve an equally convenient form of space where extreme conditions justify.

(b) Dead-end streets will not be approved except in locations designated by the planning and zoning director as necessary to future extension in development of adjacent lands. A dead-end street serving more than four (4) lots shall provide a temporary turning circle with a forty (40) foot radius or other acceptable design to accomplish adequate access.

(c) Rights-of-way for industrial subdivisions shall be a minimum of sixty (60) feet in width.

(4) Access or frontage streets: As required by a traffic impact study or as needed for principal arterials.

City of Show Low Street Design Standards

Table 1

Item

Principal Arterial (1)

Minor Arterial

Collector

Residential Four Dwellings per Acre or Greater

Residential Less Than Four Dwellings per Acre

Cul-de-sac

Commercial

Industrial

Minimum Right-of-Way

Per ADOT (1)

100′

80′

50′

50′

50′

50′

60′

Minimum Pavement Width w/o On-Street Parking

Per ADOT

42′

28′

24′

24′

22′

28′

28′

Pavement Edge Treatment

7″ ADOT C&G

6″ Vert. C&G

Ribbon Curb or Roll Curb and Gutter

Ribbon Curb or Roll Curb and Gutter

Ribbon Curb or Roll Curb and Gutter

Ribbon Curb or Roll Curb and Gutter

6″ Vert. C&G

Ribbon Curb

Sidewalk

6′ each side

Yes (3)

Yes (3)

See Table 1A

See Table 1A

See Table 1A

5′ Min Each Side (2)

None (3)

Asphaltic Concrete (4)

Per ADOT

3″

3″

3″

3″

3″

3″

4″

Roadway Base (5)

Per ADOT

8″

8″

8″

8″

8″

8″

10″

Longitudinal Slope

Per ADOT

5% – 6%

5% – 8%

5% – 12% (6)

5% – 12% (6)

5% – 12% (6)

5% – 12%

5% – 12%

Cross Slope

Per ADOT

2% – 4%

2% – 4%

2% – 4%

2% – 4%

2% – 4%

2% – 4%

2% – 4%

Curb Return Radius

Per ADOT

35′

35′

25′

25′

25′

25′

35′

Right-of-Way Radius

Per ADOT

35′

35′

25′

25′

25′

25′

35′

Minimum Centerline Radius

Per ADOT

500′

500′

150′

150′

150′

150′

150′

Tangent Between Reverse Curves

Per ADOT

100′ (7)

100′ (7)

100′ (8)

100′ (8)

100′ (8)

150′

150′

Vertical Curve (VC) Minimum Length (9)

Per ADOT

100′

100′

100′

100′

100′

100′

100′

VC Required Algebraic Difference Exceeds

Per ADOT

1%

1%

1%

1%

1%

1%

1%

On-Street Parking

No

No

No

Yes (10)

Yes (10)

Yes (10)

No

No

ADT (information only, not for design purposes)

>14,000

8,000 – 14,000

2,500 – 8,000

< 2,500

< 2,500

< 250

< 2,500

< 2,500

Street Design Notes:

1Currently, all principal arterial routes are state highways owned and maintained by the Arizona Department of Transportation.

2Sidewalk may be required on only one (1) side of the road with an increased width if approved by the planning and zoning director and the public works director. (Also, see Note 3.)

3Sidewalk type, location, and width will be determined in conjunction with Table 1A.

4Asphaltic concrete thickness to be as recommended in the geotechnical report for each project or the specified minimum, whichever is greater.

5ABC thickness to be as recommended in the geotechnical report for each project or the specified minimum, whichever is greater. ABC thickness may be reduced or eliminated with an alternate base or sub-base stabilization method as recommended by the geotechnical report and approved by the public works director. For residential streets, an acceptable substitute for eight (8) inches of ABC is six (6) inches of ABC over six (6) inches of ADOT Class 6 sub-base material. (Gradation of Class 6 material to be supplied by the city.)

6Maximum longitudinal slopes of up to eighteen (18) percent may be used for a distance not to exceed three hundred (300) feet if existing terrain dictates and if approved by the planning and zoning director and public works director.

7The tangent between reverse curves may be reduced to fifty (50) feet if the centerline radius exceeds seven hundred fifty (750) feet.

8The tangent between reverse curves may be reduced to fifty (50) feet if the centerline radius exceeds two hundred fifty (250) feet or if approved by the public works director.

9The actual length of a vertical curve shall be determined using AASHTO standards but shall not be less than one hundred (100) feet. For residential streets, the length of the vertical curve may be reduced to fifty (50) feet if existing terrain dictates and if approved by the planning and zoning director and public works director.

10On-street parking requires an additional eight (8) feet of pavement to the minimum roadway width for each lane of parking.

Note: These standards are primarily for new roadway construction. These standards may be adjusted on projects involving rehabilitation or reconstruction of existing improvements as approved by the public works director.

City of Show Low Sidewalk Design Standards

Table 1A

Average Lot Size < 10,000 square feet

Average Lot Size > 10,000 square feet

Location

All street sides, either attached or detached

Either attached or detached. May consist of: All street sides OR along through streets only OR as otherwise approved by a Subdivision Trails Plan.

Minimum Width

Four (4) feet on all cul-de-sacs, five (5) feet on all through streets

All Street Sides: Four (4) feet on all cul-de-sacs, five (5) feet on all through streets.
Through Streets: Ten (10) feet
Subdivision Trails Plan: As required by trail type.

Construction Type

Concrete

All Street Sides: Concrete
Through Streets: Concrete or asphalt
Trails: As required by trail type.

When Required

Prior to or at time of individual lot development: If sidewalks are not installed by the developer, CC&Rs (which are a part of the final plat recordation process with Navajo County) must contain the requirement that sidewalks are to be installed by individual property owner. Financial assurances, per Section 17.15.050(B)(12), shall be required by developer for installation of sidewalks on lots not built on within two (2) years from the date of acceptance of the subdivision.

Prior to or at time of individual lot development: If sidewalks are not installed by the developer, CC&Rs (which are a part of the Final Plat recordation process with Navajo County) must contain the requirement that sidewalks are to be installed by individual property owner. Financial assurances, per Section 17.15.050(B)(12), shall be required by developer for installation of sidewalks on lots not built on within two (2) years from the date of acceptance of the subdivision.

Trails: Prior to acceptance of subdivision. Developer shall provide financial assurances, per Section 17.15.050(B)(12), for completion of trail system within two (2) years from the date of acceptance of the subdivision.

Notes:

1All sidewalks shall be constructed to applicable MAG standards for relevant street types.

2All trails shall be constructed in conformance with the requirements as outlined in the city trails master plan, as adopted and amended by resolution of the city council from time to time, incorporated herein by this reference.

3Subdivision trails plan required at time of preliminary plat.

4All sidewalks and trails shall provide for connectivity to existing and proposed sidewalks and trails.

5An in-lieu fee may be substituted for sidewalks within gated subdivisions with no required connection to adjacent properties. This fee shall be utilized by the city for off-site sidewalk and trail improvements.

6All trails required as part of the city trails master plan shall be dedicated to the public.

7A subdivision trails plan may be substituted for sidewalks regardless of average lot size in planned unit developments.

8For the purposes of this table, a “through street” is defined as a non-cul-de-sac which carries more than three hundred fifty (350) vehicle trips per day.

9City staff shall have the authority to make minor modifications to these standards solely for the preservation of natural features. The planning and zoning commission and the council shall be notified of modifications.

(B) Grades.

(1) Maximum.

(a) Arterial routes: As determined by the public works director.

(b) Collector streets: Eight (8) percent.

(c) Local residential streets: Twelve (12) percent. (Reference City of Show Low Street Design Standards table, Table 1, Note 3).

(d) Cul-de-sacs cross slope on bulb: Five (5) percent maximum.

(e) Intersections: Five (5) percent. For a minimum of fifty (50) feet from points of intersection on primary street and cross slope to warp on secondary street.

(2) Minimum. All streets shall have a minimum longitudinal slope of one half of one (1/2) percent.

(3) Exceptions may be made by the planning and zoning director upon review and approval of the public works director.

(C) Vertical Curves.

(1) Arterial Routes. Minimum length one hundred (100) feet or as determined by using the AASHTO Standards, which may be reduced to fifty (50) feet on SAG vertical curves on local streets with low algebraic differences.

(2) Collector and Minor Streets. Minimum length one hundred (100) feet or as determined by using the AASHTO Standards for residential streets; the length of the vertical curve may be reduced to fifty (50) feet if existing terrain dictates and if approved by the public works director.

(3) When the longitudinal grade for all streets changes with an algebraic difference of one (1) percent on crest, two (2) percent as measured between the tangent grades in percent, a vertical curve shall be provided.

(D) Horizontal Alignment.

(1) Arterial Routes. As determined by the planning and zoning director and public works director.

(2) When tangent center lines deflect from each other more than ten (10) degrees and less than ninety (90) degrees, they shall be connected by a curve with a minimum centerline radius of five hundred (500) feet for collector streets and one hundred fifty (150) feet for local streets.

(3) Between reverse curves there shall be a tangent section of centerline not less than one hundred (100) feet long, unless the radius exceeds seven hundred fifty (750) feet on arterial and collector streets or two hundred fifty (250) feet on local streets, in which case fifty (50) feet of tangent shall be required if approved by the public works director.

(4) Streets intersecting arterial and collector streets shall do so at an angle which shall not vary from ninety (90) degrees by more than ten (10) degrees; intersections of local streets shall not vary from ninety (90) degrees by more than fifteen (15) degrees.

(5) Street jogs with centerline offsets of less than one hundred thirty-five (135) feet shall be avoided unless otherwise approved by the planning and zoning director and public works director.

(6) Minor streets intersecting a collector street or arterial route shall have a tangent section of centerline at least one hundred fifty (150) feet in length measured from the right-of-way line of the major street; except that no such tangent is required when the minor street curve has a centerline radius greater than four hundred (400) feet with the center located on the major street right-of-way line. Where topographic conditions make necessary other treatment to secure the best overall design, these standards may be relaxed by the public works director and the planning and zoning director.

(7) Street intersections with more than four (4) legs and Y-type intersections where legs meet at acute angles shall be avoided.

(8) At street intersections, property line corners shall be rounded by a circular arc having a minimum radius length of thirty-five (35) feet for collector and arterial streets and twenty-five (25) feet for local streets.

(9) The requirement of site distance studies may be required for streets intersecting in horizontal or vertical curves, which is to be determined by the city engineer or public works director.

(E) Private Streets. Private streets shall be constructed to conform to current City of Show Low street standards, including but not limited to right-of-way widths, sidewalks, trails, street lights, signs, roadway geometric criteria, and pavement structural section. If private streets are proposed for a subdivision, then the following additional requirements must be met: A homeowners association shall be established at the time the final plat is approved with a mechanism for funds to be placed in escrow account for future operations and maintenance. An emergency rapid entry system for unrestricted entry of police and fire emergency vehicles at all gated locations shall be provided. For uniformity, the only allowable system shall be the “Knox Rapid Entry System.” Finally, a note shall be placed on the final plat that states, “All private streets that are identified as a “tract” or “common areas” shall be maintained by the homeowners association. The city shall not maintain these roads unless they are improved at the expense of the property owners to city standards which are in effect at the time of the request.” Any deviation or variance from these requirements shall require city council approval.

(F) City Trails Master Plan. That certain document known as the “City Trails Master Plan,” three (3) copies of which are on file in the office of the city clerk of the City of Show Low, Arizona, which document was made a public record by Resolution No. R2008-04, is hereby referred to, adopted, and made a part hereof as if fully set out in this title, and shall constitute an amendment to this section. Further, it is the intent that this document shall be amended from time to time by resolution. (Ord. No. 2008-12, §§ 1, 2, 9-16-08; Ord. No. 2008-12, § 3, 11-18-08. 1976 Code § 12-3-2)