16.116.030 Street width and improvement standards.

Functional Classification	Number of Traffic Lanes	Minimum Distance Between Accesses (Public)	Minimum Distance Between Accesses (Private)	Minimum Right-of-Way	Paved Width	Sidewalk	Bikeways	Landscape Strip
Arterials	2—7			80'—120'	40'—52'	Yes	Yes	Yes
55 mph or more		700 ft	700 ft
50 mph		550 ft	550 ft
40-45 mph		500 ft	500 ft
35 mph or less		350 ft	350 ft
Major collector	2—5	300 ft	75 ft	60'—80'	36'—48'	Yes	Yes	Yes
Minor collector	2—3	300 ft	75 ft	60'	36'	Yes	Yes	Yes
Local streets	2	150 ft	15 ft	40'—60'	28'—36'	Yes	No	Optional
Alleys	2			20'	20'	No	No	No
Cul-de-sacs				55' Radius	100' Diameter	Yes	No	Optional
Hammerheads				As determined for adequate movement of traffic and emergency vehicles		No	No	No

B. Streets/Road Development Standards. The location, width and grade of streets shall be considered in their relationship to existing and planned streets, topographical conditions, public convenience and safety, and the proposed use of the land to be served by the streets. The arrangement of streets shall provide for the continuation or appropriate projection of existing streets in surrounding areas; or conform to a plan for development of the area to meet a particular situation where topographical or other conditions make continuance or conformance to existing streets impractical.
C. Improvements. Improvements shall have the following minimum standards unless increased at the discretion of the city engineer or public works superintendent:
1. All streets shall be rough graded for the full width.
2. All streets shall have a minimum of eight inches well graded crushed base aggregate conforming to Section 2630 of the Oregon State Highway Division Standard Specifications. The aggregate shall be as follows:

3. Base course shall be a minimum of six inches thick under asphalt concrete pavement. Base course shall be compacted to ninety-five (95) percent ASTM D 1557. Leveling course shall be a minimum of two inches thick and be compacted to ninety-five (95) percent ASTM D 1557.
4. All streets shall be paved with four inches of asphaltic concrete to be applied in a two-inch lift.
5. Grades and Curves. Grades shall not exceed six percent on arterials, ten (10) percent on collector streets or twelve (12) percent on other streets. Center line radii of curves shall not be less than three hundred (300) feet on major arterials, two hundred (200) feet collector streets or one hundred (100) feet on other streets, and shall be to an even ten (10) feet. 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, preferable, of at least 0.5 percent.
6. All street improvements shall be certified by an engineer licensed in the state of Oregon as meeting the required standards. (Ord. 2007-6 § 17; Ord. 2003-10 § 1; prior code § 10.775)