LARIMER COUNTY RURAL AREA ROAD STANDARDS

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Chapter 4 – Road Design and Technical CriteriaSection 4.7 Drainage Systemsdischarge their storm drainage from the road onto the adjacent land if suchdrainage does, in fact, occur (see Chapter 6).3. Stub roads shall end at the property line with a cul-de-sac unless the Engineerrecommends otherwise.4. All stub roads shall be fully constructed to the property line as a part of thedevelopment project. Type III barricades or approved alternative shall bepermanently installed at the end of all stub roads that do not end in a cul-de-sac.5. All cul-de-sac and stub roads that are platted as future connections to adjacentproperty shall have signage, approved by the Engineer, installed notifying thepublic that the road is planned to be extended in the future.4.6.3 Cul-De-SacsAll cul-de-sacs shall conform to all requirements shown in Standard Drawing 6 inAppendix C.4.7 DRAINAGE SYSTEMS4.7.1 Drainage1. Drainage system design shall be in accordance with Chapter 6 and currentLarimer County Stormwater Design Standards.2. For developments with average lot frontages less than or equal to 200 feet, curband gutter will be required rather than an open ditch system.4.7.2 SubdrainsSubdrains are not allowed in the right-of-way or allowed to discharge into the right-ofwayunless approved by the Engineer.4.7.3 Rural Roadside DitchesAll rural roadway sections designed with roadside drainage ditches must be constructedwith the appropriate erosion control methods as discussed in Chapter 8.4.7.3.1 SlopeThe slope and capacity of any roadside ditches shall be maintained in areas thatdriveways cross the ditch.4.7.3.2 MaintenanceAll driveway improvements within the right-of-way of a land development, includingpiping and ditches, are the responsibility of the adjoining property owner. The Countywill not provide maintenance of these items.4.7.3.3 Culvert DesignSee Drawing 11 in Appendix C. Cover over the pipe shall be designed to the pipemanufacture’s requirements.Larimer County Rural Area Road Standards Page 4-7October 22, 2007
Chapter 4 – Road Design and Technical CriteriaSection 4.8 Emergency Access Requirements4.8 EMERGENCY ACCESS REQUIREMENTSAny emergency access not on public roads shall be provided in accordance with the EmergencyAccess Section in the Land Use Code or in accordance with the requirements of the appropriateFire District. The following requirements shall be considered minimum standards unless theappropriate Fire Authority approves an alternative design.4.8.1 SlopeThe slope of the fire lanes shall be a minimum of 0.5 percent and a maximum of 8percent.4.8.2 Cross SlopeThe Cross Slope of the fire lanes shall be minimum of 1.0 percent and a maximum of 4.0percent.4.8.3 Lane WidthThe lane width shall be a minimum of 20 feet from the edge of the roadway to edge ofthe roadway and shall be in an access easement. The access easement shall have aminimum width of 40 feet. The lane widths may be required to be increased throughhorizontal curves to accommodate fire truck passage.4.8.4 Vertical ClearanceThere shall be a minimum of 13.5 feet of vertical clearance over the entire fire lane.4.8.5 BarricadeThe fire lane shall have a barricade at one or both ends, but it must be approved inwriting by the appropriate Fire District and the Engineer.4.8.6 Roadway SurfaceThe surface of the roadway must be a surface in accordance to the requirements of theappropriate Fire District. The minimum surfacing requirement is 4” of Class 5 aggregatebase course. All access roadways shall be maintained and kept clear for emergency useat all times.4.9 INTERSECTIONSIntersections shall be designed to provide for the safety of motorists, pedestrians, and bicyclists.This section is based on criteria from the Institute of Transportation Engineers TrafficEngineering Handbook and AASHTO’s “A Policy on Geometric Design of Highways andStreets”.4.9.1 Intersection Type and Design Criteria4.9.1.1 Intersection Control TypeIntersection control type shall be determined by standard warrants included in theManual on Uniform Traffic Control Devices (MUTCD) and as directed by the County.Modern Roundabouts are considered a form of traffic control and the CountyEngineer may require consideration (and if appropriate, construction) of aLarimer County Rural Area Road Standards Page 4-8October 22, 2007
Page 1 and 2: LARIMER COUNTYRURAL AREA ROAD STAND
Page 3 and 4: Table of Contents3.3.11 Typical Str
Page 5 and 6: Table of ContentsCHAPTER 8 - ENVIRO
Page 7 and 8: Table of Contents12.3.7.2 Conventio
Page 9 and 10: Table of ContentsG.7.12 Other Permi
Page 11 and 12: Chapter 1 - General InformationSect
Page 17 and 18: Chapter 2 - Submittal ProceduresSec
Page 19 and 20: Chapter 2 - Submittal ProceduresSec
Page 21 and 22: Chapter 3 - Submittal Requirements
Page 27 and 28: Chapter 4 - Road Design and Technic
Page 31: Chapter 4 - Road Design and Technic
Page 35 and 36: 4.9.1.7 Design VehiclesChapter 4 -
Page 39 and 40: CHAPTER 5 - GEOTECHNICAL STANDARDS
Page 41 and 42: Chapter 5 - Geotechnical Standards
Page 49 and 50: Chapter 6 - STORMWATER MANAGEMENTSe
Page 51 and 52: Chapter 7 - Bridges and Major Drain
Page 53 and 54: Chapter 8 - Environmental and Agric
Page 55 and 56: Chapter 8 - Environmental and Agric
Page 57 and 58: 9.1.3 DefinitionsChapter 9 - Roadwa
Page 59 and 60: CHAPTER 10 - ACCESS REQUIREMENTS AN
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Chapter 12 - Right of Way Permittin
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Appendix A - Definitions and Abbrev
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Appendix A - Definitions and Abbrev
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APPENDIX B - REFERENCES AND RESOURC
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APPENDIX D - CONSTRUCTION STANDARDS
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Appendix D - Construction Standards
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APPENDIX E - CONSTRUCTION TESTING F
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Appendix F - Guidelines for Traffic
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APPENDIX G - DESIGN AND CONSTRUCTIO
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Appendix G - Design and Constructio
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Appendix H - General NotesSection H
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APPENDIX I - VARIANCE REQUEST SUBMI
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LARIMER COUNTY RURAL AREA ROAD STANDARDS

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