The design cross section defines the location of the standard right-of-way elements (existing and proposed) for a project location. The standard elements are illustrated in Figure 4-10: Standard Design Cross Section and include: right-of-way line and width, roadway width, planting strip and shoulder, catch line, existing and new grade, slope line, sidewalks, street tree, curb, gutter, crown, depression line, thickened edge, pavement, water main, sanitary sewer and storm drain.

030 Standard Locations for Utilities
400 Half Section Grade
401 Residential Pavement Section
402 Commercial Arterial Section
403 Cement Concrete Alley Pavements

Required Cross Sections for Street Improvement Plans : SDOT requires that street improvement plans include a typical dimensioned cross section. Proposed street and alley improvements require dimensioned cross sections as follows:

• every 25 feet for the length of the improvement;
• at each end of the improvement;
• at all driveways; and
• at all building entrances located within 10 feet of the property line.

All cross sections shall be stamped and signed by the Project Design Engineer.

Description of Required Elements : The design cross sections shall describe the following:

• existing and proposed grades, with spot elevations provided at the centerline;
• existing edge of pavement;
• gutter line or flow line;
• top of curb or thickened paved edge;
• back of sidewalk;
• property lines;
• catch lines; and
• any retaining walls or rock facing.

Elevations : Existing elevations shall be based on current survey data. Elevations on design cross sections shall be consistent with elevations shown on the street profile maps or in locations where street improvements are not required, consistent with the elevations shown on the Building Grade Sheet.

Cross Slopes : The standard roadway cross slope is 2% down from crown to gutter line or edge of pavement. In areas where pavement width is being added to an existing street, the slopes may vary, when necessary, as follows:

Alley cross slopes : Alley cross slopes may be adjusted when it is necessary to provide access to existing driveways and garages along the alley as defined in the table in Section 4.5.2 Design Criteria, Roadway Cross Slopes. Application of this cross-slope standard requires consideration of an ADA accessible route for the entire alley as defined in Standard Plan 403.

Whenever possible, street improvements shall conform to the standard right-of-way cross section described in Figure 4-10: Standard Design Cross Section.