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Curb type: the curb type used depends on the type of pavement being installed and shall be in accordance with Seattle Standard Plans 401 and 402. In general, a Seattle Standard Plan 410B curb and gutter is used with flexible pavement and a Seattle Standard Plan 410C doweled curb is used with rigid pavements.
Curb height: Seattle’s standard curb height is 6 inches. Unless otherwise directed by SDOT, a new curb to replace an existing curb in the existing location shall be 6 inches high with a transition, if needed, to existing curb height at each end.
Permanent curb location: When an existing curb and sidewalk are removed in conjunction with demolition and construction, the new curb shall be placed in the permanent location. The permanent curb location is the edge of the design roadway width in Chapter 3.1 Overview of Requirements from the Land Use Code. An existing curb less than 4 inches in height shall be reconstructed in conjunction with other construction activity in the right-of-way but need not be moved to the permanent location.
Curb setbacks and pedestrian bulbs : Curb setbacks and pedestrian bulbs have been established to ensure the public’s safety and allowing for street sweepers to negotiate curb line variations. The installation of a parking curb setback in conjunction with a development proposal requires the approval of both the SDOT and DPD Directors. The curb radii used for an 8 feet parking curb setback is 20 feet while the curb radii used for a 6 feet pedestrian bulb is 10 feet for the radius nearest to the travel lane and 20 feet for the radius closest to the right-of-way margin.
Parking curb setbacks : Parking curb setbacks are not permitted on streets where parking is allowed in the existing curb lane. DPD reviews the curb setback from a land use perspective and SDOT reviews it from a traffic operations and street maintenance perspective. Construction of a curb setback requires a Street Improvement Permit. Refer to Figure 4-14: Parking Curb Setback.
Construction of new curb : When a new curb or curb and gutter is constructed, it shall be located in the permanent location required for the adjacent land use zone. Additional paving shall be provided between the existing edge of pavement and the new curb, as needed. In addition, a portion of the existing roadway pavement abutting the site shall be reconstructed as needed when the centerline grades are not the established profile grades, when the existing pavement is in poor condition (indicating inadequate subgrade or pavement strength), when the cross slope of the existing pavement is too flat or too steep, or when the street was not graded to the standard design cross section prior to paving. |
