ROAD AND BRIDGE DESIGN STANDARDS AND CONSTRUCTION SPECIFICATIONS ADOPTED BY RESOLUTION #2005-40 As Revised by Resolution 2017-19 on May 2, 2017 ARCHULETA COUNTY ROAD AND BRIDGE DESIGN STANDARDS AND CONSTRUCTION SPECIFICATIONS May 2, 2017 TABLE OF CONTENTS 27.0: INTRODUCTION ....................................................................................................................................................... 5 27.0.1: Purpose and Intent ...................................................................................................................................... 5 27.0.2: Authority .................................................................................................................................................... 5 27.0.3: Types of Roads ........................................................................................................................................... 5 27.0.3: Road Numbering & Naming ...................................................................................................................... 5 27.0.4: Application of Design Standards and Construction Specifications .......................................................... 5 27.0.5: Construction of New Roads and Recreational Pathways .......................................................................... 5 27.0.5.1: New Roads and Recreational Pathways to be built by Applicants ......................................... 5 27.0.5.2: New Roads and Recreational Pathways to be built by County ............................................... 6 27.0.6: Upgrading of Existing County Roads and Recreational Pathways ........................................................... 6 27.0.6.1: Upgrading Needed to Accommodate New Development ....................................................... 6 27.0.6.2: Upgrading Requested by Property Owners ............................................................................. 7 27.0.7: Permits for Road, Bridge and Recreational Pathways Construction ........................................................ 8 27.0.8: Road Vacations .......................................................................................................................................... 8 27.1: ROAD, BRIDGE, AND RECREATIONAL PATHWAY DESIGN CRITERIA ..................................................... 8 27.1.1: Purpose and Intent ...................................................................................................................................... 9 27.1.2: Road Functional Classifications ................................................................................................................ 9 27.1.2.1: Principal Arterials .................................................................................................................... 9 27.1.2.2: Minor Arterials ......................................................................................................................... 9 27.1.2.3: Major Collectors....................................................................................................................... 9 27.1.2.4: Minor Collectors ...................................................................................................................... 9 27.1.2.5: Local Access Roads ................................................................................................................. 9 27.1.2.6: Low Volume Roads ................................................................................................................. 9 27.1.2.7: Primitive Roads ........................................................................................................................ 9 27.1.3: Road Design ............................................................................................................................................. 10 27.1.3.1: Future Planning ...................................................................................................................... 10 27.1.3.2: General Design Elements ....................................................................................................... 10 27.1.3.3: Specific Design Elements ...................................................................................................... 11 27.1.3.4: Payment of Costs for New Road Construction ..................................................................... 17 27.1.4: Upgrading Existing Roads ....................................................................................................................... 23 27.1.4.1: Design Standards .................................................................................................................... 23 27.1.5: Bridge Design ........................................................................................................................................... 24 27.1.5.1: Design Standards for Bridges ................................................................................................ 24 27.1.5.2: Payment of Bridge Construction Costs ................................................................................. 24 27.1.6: Traffic Safety ............................................................................................................................................ 24 27.1.6.1: Guardrails ............................................................................................................................... 24 27.1.6.2: Traffic Control Devices ......................................................................................................... 25 27.1.6.3: Sight Distance Triangle .......................................................................................................... 25 27.1.6.4: Aboveground Utility Location ............................................................................................... 26 27.1.6.5: Rural Free Delivery Multi Box Modules............................................................................... 26 27.1.7: Driveways and Parking Areas.................................................................................................................. 27 27.1.7.1: Requirement for Access Permit ............................................................................................. 27 27.1.7.2: Requirement for Grading Permit ........................................................................................... 27 27.1.7.3: Design Standards for Driveways ........................................................................................... 27 27.1.7.4: Design Standards for Parking Areas ...................................................................................... 30 27.1.8: Landscaping ............................................................................................................................................. 31 27.1.9: Recreational Pathways ............................................................................................................................. 32 27.1.9.1: Definitions .............................................................................................................................. 32 - 2 - ARCHULETA COUNTY ROAD AND BRIDGE DESIGN STANDARDS AND CONSTRUCTION SPECIFICATIONS May 2, 2017 27.2: ROAD, BRIDGE AND RECREATIONAL PATHWAY CONSTRUCTION SPECIFICATIONS ..................... 38 27.2.1: Purpose and Intent .................................................................................................................................... 38 27.2.2: Closing of Streets, Roads, and Recreational Pathways ........................................................................... 38 27.2.2.1: Notice and Operation of Road Closure ................................................................................. 38 27.2.3: Construction of Roads and Recreational Pathways ........................................................................... 38 27.2.3.1: Permits Required for Road and Recreational Pathway Construction ............................... 38 27.2.3.2: Construction Inspection and Testing Requirements for Road and Recreational Pathway Construction ..................................................................................................................... 38 27.2.3.3: Site Preparation ...................................................................................................................... 39 27.2.3.4: Structural Embankment Construction ................................................................................... 40 27.2.3.5: Trench Excavation ................................................................................................................. 40 27.2.3.6: Culverts ............................................................................................................................ 41 27.2.3.7: Subgrade ................................................................................................................................. 42 27.2.3.8: Gravel Roads .......................................................................................................................... 43 27.2.3.9: Asphalt Paved Roads ............................................................................................................. 43 27.3: ACCESS PERMIT REQUIREMENTS .................................................................................................................... 48 27.3.1: Purpose and Intent 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