Roadway Standards - NEW | Clackamas County

Roadway designs in Clackamas County strive to achieve sustainable outcomes when safety, convenience, aesthetics, resource protection, ease of maintenance, and community livability are considered.

These Standards provide the minimum criteria for design and construction of roadways, accesses, site development, and integrated drainage facilities under the jurisdiction of Clackamas County.

Definitions | Abbreviations | Associated Documents | ADA (Americans with Disabilities Act) Checklists

Standards

Chapter 1 - General Considerations

Section 110 - General Provisions

Section 115 – Other Standards, Guidelines & References

Section 120 - Development Related Improvements

Section 130 - Permit Requirements

130.1 General Requirements
130.2 Exceptions To Requirements For Permit
130.3 General Permit Requirements
130.3.1 Responsibility
130.3.2 Application Submission
130.3.3 Fees
130.3.4 Contractor Requirements For Licensing, Bonding, & Insurance
130.3.5 Property Owner Requirements For Insurance
130.3.6 Permit Approval
130.3.7 Application Period, Approval Period & Extensions
130.3.8 Revocation Or Modification Of Permits
130.3.9 Notification
130.3.10 Construction Noise
130.3.11 Inspection
130.3.12 Final Inspection/Project Close-Out
130.4 Permit Types & Requirements; Stormwater & Erosion Control Reviews
130.4.1 Development Permit
130.4.2 Entrance (Entry) Permit
130.4.3 Utility Placement Permit
130.4.4 Right-Of-Way Permit
130.4.5 Stormwater Review
130.4.6 Erosion Control Review

Section 140 – Permit And Plan Submittal Requirements

140.1 Development Permit Submittal
140.1.1 Plan View Sheets
140.1.2 Profile View
140.1.3 Half Street/Cross Section Views
140.1.4 Stormwater Report & Drainage Calculations
140.1.5 Other Requirements
140.1.6 Other Reviewing Agencies
140.1.7 As-Built Plans
140.2 Entrance, Utility And Right-Of-Way Permit Submittals

Section 150 - Surveying

150.1 General
150.2 Existing Survey Monuments
150.3 New Survey Monuments

Section 160 - Dedication Of Public Right-Of-Way And Easements

160.1 Requirement For Public Easement
160.2 County Approval Required
160.3 Development Permit Required
160.4 Minimum Width Requirements For Rights-Of-Way And Easements
160.5 Public Easement Dedication Process
160.6 Dedication Of Public Right-Of-Way And Easements On The Plat
160.7 Dedication Of Public Right-Of-Way And Easements Outside Of The Plat

Section 170 - Design Modifications & Ada Exceptions

170.1 Design Modifications
170.1.1 Modification Request Submittal
170.1.2 Criteria For Modification Of Standards
170.1.3 Review
170.1.4 Appeal
170.2 Ada Exceptions
170.2.1 Exceptions For New Ada Accessibility Features
170.2.2 Exceptions For Alterations To Existing Ada Accessibility Features
170.2.3 Ada Exception Request Submittal

Section 180 - Construction Inspection 31

180.1 General
180.2 County Inspector Authority And Duties
180.3 Primary Inspector
180.3.1 Developer Engineer Agreement
180.3.2 Certificate Of Compliance And Completion
180.3.3 When A Primary Inspector Is Required
180.3.4 Primary Inspector Authority And Duties
180.4 Testing
180.5 Required Inspections Of Ada Accessibility Features
180.6 Inspection Requests
180.7 Failure To Obtain Inspection

Section 190 - Performance Surety, Warranty And Acceptance Of Work 34

190.1 General
190.2 Substantial Completion For Development Permits
190.3 Performance Surety
190.3.1 Forms
190.3.2 Timeframe
190.3.3 Amount
190.4 Maintenance And Warranty Period For Development Permits
190.5 Maintenance And Warranty Period For Utility Permits
190.6 Acceptance Of Work
190.7 Acceptance Of Roads
190.8 Nonperformance Of Permit

Chapter 2 - Roadway Design & Construction

Section 210 – General

Section 215 - Functional Classification & Regional Street Design Guidelines

Section 220 - Access Management

220.1 General
220.2 General Requirements
220.3 Access Spacing Standards
220.4 Additional Access Requirements
220.5 Roadway Intersection Management
220.6 Modification Considerations

Section 225 - Roadway Development

225.1 Future Extension Of Roadways Related To Development
225.2 Termination Of Roadways/Dead End Streets (Cul-De-Sacs, Turnarounds & Hammerheads)
225.3 Opening Or Upgrade Of Unimproved Or Substandard Public Right-Of-Way To Benefit Private Access
225.4 Off-Site Access Standards
225.5 Structural And Surface Road Improvements Related To Development
225.6 Construction Haul Routes
225.7 Creation Of A Private Roadway

Section 230 – Residential, Agricultural & Logging Driveway Design

230.1 General
230.2 Standard Drawings
230.3 Provisions For Ada Accessibility Of Driveways
230.4 Driveway Vertical Geometry
230.5 Driveway Horizontal Geometry
230.6 Driveway Structural Capacity
230.7 Emergency Services
230.8 Driveway Surface Water
230.9 Driveway Culverts
230.10 Intersection Angle
230.11 Permit Requirements
230.12 Inspection Requirements
230.13 Intersection Sight Distance Requirements
230.14 Maintenance Requirements

Section 240 - Sight Distance

240.1 General
240.2 Sight Distance – Standard
240.3 Existing Offsite Public Roadway Intersections
240.4 Intersection Sight Distance Measurement
240.5 Stopping Sight Distance Measurement
240.6 Sight Distance Design Speed

Section 245 - Roadside & Clear Zone

245.1 General
245.2 Clear Zone Measurement
245.3 Clear Zone Standards
245.4 Clear Zone Requirements
245.4.1 Fixed Objects Allowed In Clear Zone
245.4.2 Embankments And Ditches
245.4.3 Vegetation
245.4.4 Above Ground Appurtenances
245.5 Clear Zone Exceptions

Section 250 - Geometric Design

250.1 General
250.1.1 Roadway Cross Section
250.1.2 Design Speed
250.1.3 Design & Control Vehicle
250.2 Curbs
250.3 Pedestrian Improvements - General
250.3.1 Sidewalks
250.3.2 Shared-Use (Multi-Use) Paths
250.3.3 Cycle Tracks
250.3.4 Landscape Strips
250.3.5 Right-Of-Way And Easements
250.3.6 Horizontal And Vertical Clearance
250.3.7 Pedestrian Facilities Cross Slope
250.3.8 Curb Ramps
250.3.9 Curb Ramp Closures
250.3.10 Bulb Outs (Curb Extensions)
250.3.11 Midblock Crosswalks
250.3.12 Pedestrian Facility Condition & Repair
250.4 Bicycle Improvements
250.4.1 Shared Use Paths
250.4.2 Other Bicycle Facilities
250.5 Transit Improvements
250.6 Horizontal Alignment
250.6.1 Horizontal Curves
250.6.2 Design Intent For Horizontal Curves
250.6.3 Exceptions For Very Low Volume (≤400 Adt) Local Streets With A Speed Of 25 Mph Or Less
250.6.4 Roadway And Marking Transitions
250.6.5 Lane Widths
250.7 Vertical Alignment
250.7.1 Minimum Roadway Gradient
250.7.2 Maximum Roadway Gradient
250.7.3 Intersection Landing
250.7.4 Vertical Curves
250.7.5 Roadway Widening
250.7.6 Superelevation
250.8 Intersections
250.8.1 Minimum Curb Radii
250.8.2 Intersection Angle
250.8.3 Roadway/Lane Offset
250.8.4 Tangent Section
250.8.5 Residential Intersection Design
250.8.6 Roundabouts
250.8.7 Intersection Sight Distance
250.8.8 Turn Lane Design
250.9 Roadway Grading
250.10 Non-Traversable Medians And Accessible Route Islands 63

Section 252 - Structural Section

252.1 Subgrade Evaluation
252.2 Asphaltic Concrete
252.3 Portland Cement Concrete ("PCC")
252.4 Cement Stabilized Roadway (CSR) By Full Depth Reclamation (FDR) Or Cement Treated Base (CTB)
252.4.1 General
252.4.2 Materials, Preparation & Equipment
252.4.3 Construction
252.4.4 Curing
252.4.5 Micro-Cracking
252.4.6 Performance
252.4.7 Traffic Control Considerations

Section 255 - Landscaping

255.1 Topsoil
255.2 Shrubs, Plants And Grasses
255.3 Street Trees
255.3.1 Street Tree Selection
255.3.2 Street Tree Quality At Time Of Planting
255.3.3 Street Tree Condition At Time Of Planting
255.3.4 Preparation Of Tree Planting Holes
255.3.5 Seating Of Trees
255.3.6 Staking
255.3.7 Establishment Period
255.3.8 Root Barrier
255.4 Sight Distance

Section 260 - Traffic Signals, Flashers & Communication

260.1 Traffic Signal Approval
260.1.1 Traffic Analysis
260.1.2 Traffic Signal Warrants
260.1.3 Traffic Signal Spacing
260.2 Traffic Signal Design
260.3 Traffic Signal Materials
260.4 Material Submittals
260.5 Traffic Signal Funding And Agreements
260.6 Underground Communication Conduit
260.7 Fiber Optic Communication
260.8 Flashers In School Zones

Section 265 - Traffic Calming

Section 270 - Traffic Signing

270.1 Design And Construction Requirements
270.2 Street Name Signs
270.3 End Of Street
270.4 End Of Sidewalk
270.5 Sign Mounting

Section 280 - Pavement Markings

280.1 Crosswalk Markings
280.2 Left Turn And Right Turn Lanes Markings
280.3 Stop Bars
280.4 Transverse Marking Materials
280.5 Longitudinal Markings
280.6 Reflective Pavement Markers (RPMS)
280.7 Temporary Markings
280.8 Marking Materials
280.9 Marking Layout

Section 290 - Temporary Traffic Control

290.1 General
290.2 Control Of Site
290.3 Temporary Pedestrian Accessible Route
290.4 Impacts To Traffic Signals
290.5 Temporary Road Closures

Section 295 - Transportation Impact Study (TIS) Requirements

295.1 General
295.2 Requirement For A Traffic Impact Study
295.3 Traffic Study Scope And Coordination
295.4 Traffic Engineering Expertise
295.5 Coordination With Other Agencies
295.6 Zone Changes And Comprehensive Plan Amendments
295.7 Clackamas Regional Center (Crc) Area Analysis Period
295.8 Analysis Methodology
295.8.1 Two-Way Stop Controlled (Twsc) Intersections
295.8.2 All-Way Stop Controlled (Awsc) Intersections
295.8.3 Signalized Intersections
295.8.4 Roundabout Intersections
295.9 Signalized Intersection Analysis Parameters
295.10 Peak Hour Factor ("Phf")
295.11 Microsimulation Models
295.12 Growth Rates And In Process Traffic
295.13 Turning Movement Counts
295.13.1 Count Hours
295.13.2 Day Of Week
295.13.3 Holidays
295.13.4 Current Counts
295.13.5 Vehicle Classification, Bicycles And Pedestrian Data
295.14 Trip Generation
295.15 Trip Distribution
295.16 Queuing Analysis
295.17 Traffic Safety
295.17.1 Crash History
295.17.2 Truck Circulation
295.18 Mitigation
295.18.1 Turn Lane Warrants
295.18.2 Traffic Signal Approval
295.18.3 Analysis Of Impacts On Local, Residential Streets
295.18.4 Other Mitigation
295.19 Traffic Study Components
295.19.1 Executive Summary
295.19.2 Project And Study Area Description
295.19.3 Analysis Periods And Scope
295.20 Submittal Requirements

Chapter 3 - On Site Design Of Commercial, Industrial And Multifamily Developments

Section 310 - General

Section 320 – Parking Areas

320.1 Maximum Slopes And Grades
320.2 Pedestrian Walkways
320.3 Vehicular Circulation And Maneuvering
320.4 Parking And Maneuvering Area Surface & Structural Section
320.5 Parking Stalls
320.6 Curbs And Wheel Stops
320.7 Signage And Pavement Markings
320.8 Reciprocal Access Easements

Section 330 - Commercial, Industrial And Multifamily Driveways

Section 340 - Refuse And Recycling Enclosure Standards For Commercial, Industrial And Multifamily Developments

Chapter 4 - Storm Water Management

Section 410 - General

410.1 Regulatory Authority
410.2 Engineering Regulations
410.3 Erosion Control Contractor Certification Not Required
410.4 Fees

Section 420 - Exceptions To Wes Standards

420.1 Best Management Practices (Bmp) & Low Impact Development Approaches (Lida)
420.2 Acreage As A Bmp
420.3 Surface Water Management Applicability
420.4 Underground Injection Control (Uic) Devices

Section 430 - Hydrology