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These Roadway Standards provide the criteria for design and construction of roadways, accesses, site development and integrated drainage facilities under the jurisdiction of Clackamas County.
Clackamas County is interested in comments and suggestions for improvements to the Roadway Standards. Please contact us at engineering@clackamas.us or 503-742-4691 with suggestions or questions or to obtain the Standard Drawings in AutoCAD (dwg) format.
Roadway Standards Updated June 2020
Standard Drawings, updated June 2020
- C100 Street Structural Section
- C110 Local/Connector Roadway Section
- C130 Collector Roadway Section
- C140 Arterial Roadway Section
- C200 Temporary Turnaround
- C220 Passenger Vehicle Turnaround
- C300 Standard Cul-de-sac Local Road
- C350 Truck Turnarounds & Turnouts for Public/Private Road & Driveways
- C400 Alternative Horizontal Curves for Very Low Volume Roads (<400 ADT)
- D250 Typical Plan for Driveway Culvert Installation
- D400 Standard Driveway Entry onto Unpaved County Roads
- D500 Standard Driveway Entry onto Paved County Road with No Curbs
- D600 Standard Driveway to Curbed County Roads with No Landscape Strip
- D650 Standard Driveway to Curbed County Roads with Landscape Strip
- D675 Alternative High Volume Driveway with Curbs
- D700 Driveway Water Bar (Berm) Construction
- L100 Tree Planting Details
- L200 Street Tree Location
- M100 Monument Box Less Than 35 MPH
- M150 Monument Box Greater Than 35 MPH
- N100 Standard Notes - General
- N200 Standard Notes - General (cont) & Grading
- N300 Standard Notes - Street, Storm & Utility
- P100 Parking and Aisle Layout Details (9' x 18')
- P200 Parking and Aisle Layout Details (8.5' x 16')
- R100 Private Roads & Driveways - Minimum Standards
- S100 Standard Type C Vertical Curb & Curb Details
- S150 Standard Curb and Gutter
- S180 Mountable Curb
- S960 Standard Sidewalk & Curbed Ramp Notes & Details
- T100 Street Name Signs & Details
- T130 Street Name Signs and Details (continued)
- T150 Street Mounting and Attachments
- T250 Sign Installations
- T300 Horizontal Sight Distance Along County Roadways
- T350 Type III Barricade End of Road
- U100 Underground Utility Placement Zones
- U200 Standard Trench and Backfill
- U250A Standard Trench with Controlled Density Backfill (CDF)
- U250B Notes for U250A
- U270A Alternative Trench with Controlled Density Backfill
- U270B Notes for U270A
- U275 Pavement Cut Standard Arterial/Collector Roads
- U280 Pavement Cut Standard Connector/Local Road
- U290 Pavement Cut Standard Multiple Trenches
- U295A Utility Pothole Repair Standards
- U295B Notes for U295A
Associated Documents
- Certificate of Compliance and Completion
- Clackamas County Street Tree List
- Developer - Engineer Agreement
- Design Modification form
- Entrance Permit Matrix
- Mailbox Installation Standards
- Shrub, Groundcover, Riparian Plant List
