Roadway Standards Section 215 - Functional Classification & Regional Street Design Guidelines

1. The functional classification of existing and planned roadways has been established by the Comprehensive Plan, Chapter 5 - Transportation.  Design standards for new roadway construction and existing roadway improvements are based on these functional classifications.  The functional classification of a roadway determines how the roadway will be designed.
2. Functional classifications of individual roadways can be found on Maps 5-4a and 5-4b of the Comprehensive Plan.  Descriptions of each functional classification can be found Chapter 5of the Comprehensive Plan. 
3. Roadway design shall consider the Regional Street Design Type Guidelines as described per Comprehensive Plan policy 5.O.5 as illustrated in Map 5-5. 
4. Community Planning Areas, as referenced in the Comprehensive Plan, have exceptions to these Standards.  Otherwise, Standard Drawings C110 through C140 shall be used for design of roads under the jurisdiction of Clackamas County.
5. Use of Urban Alternate 1 and 2 sections per Standard Drawing C110 may be considered on very low volume roads or roads that cannot be extended, and where the alternate street section would better accommodate:
   1. Sustainable surface water management solutions such as low infiltration planters and basins, swales, ponds, rain gardens, trees, and minimal disruption to natural drainage systems;
   2. Preservation of existing significant trees and native vegetation;
   3. Preservation of natural terrain and other natural landscape features; and
   4. Existing development.
6. All other roadway design shall comply with these Standards.