Design procedures shall conform to accepted engineering practices approved by a registered professional engineer.
(Ord. 483 § 4.1(1), 1980)
Vertical clearance above the paved roadway surface shall be a minimum of 16-1/2 feet. Vertical clearance of structures above the walkway surface shall be a minimum of eight feet.
(Ord. 483 § 4.1(2), 1980)
The lateral clearance between curb face and the closest part of any fixed object (excluding traffic-control signs and breakaway supports), shall be at least three feet.
(Ord. 483 § 4.1(3), 1980)
Bridges shall be designed to the requirements set forth in the latest American Association of State Highway and Transportation Officials (AASHTO), Standard Specifications for Highway Bridges. Bridges shall have a minimum roadway width of 28 feet. Sidewalks shall be in addition. Design live loading for all bridges shall be not less than HS 20-44.
(Ord. 483 § 4.1(4), 1980)
Current editions of Standard Specifications of the Washington State Department of Transportation (WSDOT), or the American Public Works Association (APWA), shall be used. In addition, the city allows the use of WSDOT's General Special Provisions (GSPs) for Porous Hot Mix Asphalt (PHMA), Porous Warm Mix Asphalt (PWMA) and Pervious Concrete (PConcrete) developed by the Construction Materials Committee of the American Public Works Association (APWA) Washington.
(Ord. 483 § 4.1(6), 1980; Ord. 1198 § 4, 2017)
All traffic-control devices shall conform to the Manual on Uniform Traffic Control Devices (MUTD), as modified by the Washington State Transportation Commission.
(Ord. 483 § 4.1(7), 1980)
There shall be a minimum four-foot (clear) surfaced walkway on each side of the street unless topography or other special conditions favor one walkway only, such as heritage trees, significant trees, and drainage facilities; special conditions warranting exceptions require approval by the director. The city will designate the minimum width and locations of walkways.
(Ord. 483 § 4.1(8), 1980; Ord. 1198 § 5, 2017)
Where an approach rail is required, it will be made continuous with the bridge railing. Railing height for pedestrian-only traffic is three feet six inches, for bicycles only is four feet six inches, for combined is four feet six inches. When concrete barriers are used to separate vehicles from pedestrians and bicycles, the 32-inch concrete barrier shall have a metal rail extension providing a total height of four feet six inches.
(Ord. 483 § 4.1(9), 1980)
Ramps shall be included in all construction. See RCW 35.68.075 "Curb Ramps for Physically Handicapped Required," as amended by Ch. 137, "Sidewalk Ramps," Washington Laws, 1977 First Extraordinary Session.
(Ord. 483 § 4.1(10), 1980)