LARIMER COUNTY RURAL AREA ROAD STANDARDS

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Appendix G – Design and Construction Standards for Private Local Access RoadsSection G.3 Engineered Designplan must give the location of the work, the name of the owner, the name of the personwho prepared the plan, and the contractor proposed to accomplish the work, ifapplicable. The plan must include the following specific information:1. A copy of the Pre-application Inspection Report from the Larimer CountyEngineering Department, if applicable.2. Horizontal alignment of the proposed road shown on a topographic map ofsufficient scale to allow cut and fill volumes and longitudinal profile to beestimated.3. Locations, dimensions, and designed flow capacity of proposed drainagestructures such as culverts.4. Typical cross-sections of the road design showing width, drainage featuredimensions, depth of road surfacing materials, and proposed sub-gradetreatment. A cross section must be shown for each major change in designparameters.5. Location of any buildings, structures, natural drainages, wetlands, and waterfeatures within 100 feet of the grading work or that may be affected by theproposed grading work.6. An erosion control plan specific to the site conditions delineating temporary andpermanent mitigation measures to minimize erosion and sediment transport.See Larimer County Stormwater Design Standards, June 20, 2005, Addendum toVolume 3 of the USDCM, for examples of accepted Best Management Practicesfor such mitigation measures.G.3 ENGINEERED DESIGNIn some cases, where the safety or functionality of the road is compromised by complicated orunstable geology, large stream crossings, or other complicated drainage issues, an engineereddesign may be required by the Engineer. In these cases the application must be accompaniedby appropriate drainage reports, soils engineering reports and/or engineering geology reports asrequired by the Engineer. The plans and specifications must be prepared and signed by anindividual licensed by the State of Colorado to prepare such plans or specifications. Theengineer preparing the plans must inspect as necessary and certify that the grading was done inaccordance with the final approved plan.G.4 RESOLUTION OF CONFLICTSIn cases where irreconcilable differences arise between the Engineer and the applicant, theapplicant may request a variance as described in Chapter 1 of the Larimer County Rural AreaRoad Standards.G.5 NOTICE OF COMPLETIONThe applicant must notify the Engineer or the designated official when the road is ready for finalinspection. Final approval will not be given until all work, including installation of all drainagefacilities and their protective devices, and all erosion control measures, has been completed inaccordance with the final approved plan, and any required certifications are submitted.Larimer County Rural Area Road Standards Page G-3October 22, 2007
Appendix G – Design and Construction Standards for Private Local Access RoadsSection G.6 FeesG.6 FEESApplication fees for plan review and field inspection(s) must be paid before the RoadConstruction Permit is granted. Payment of final inspection fees shall be paid before finalacceptance/certification is granted.G.7 <strong>ROAD</strong> DESIGN <strong>STANDARDS</strong>Private local roads accessing multiple residential parcels (multiple access roads) or servingbusinesses that will involve travel by the general public must be constructed to the followingstandards. Although the standards are considered to be minimums to provide a safe, functionalroad, they represent the idealized situation where few physical constraints exist. A typical crosssection is represented in Figure 1. Many areas in rural Larimer County possess unique physicalattributes which make it necessary to construct the road to fit the individual site circumstances.Deviations from the minimum standards herein, to address such problems, must be shown onthe construction plans at time of permit application. Field changes must be approved in writingby the Engineer or his designated representative. They must also be shown on as-builtdrawings at the time of final inspection.For roads accessing single family residences, the standards herein can be used as designguidelines. While construction of such roads to the Larimer County standards is optional, it ishighly recommended and will benefit the landowner. Individuals wishing to certify construction ofthese roads to County standards may apply for a Private Road Construction Permit and complywith the following road design standards. All fees will apply. Reconstruction of pre-existingroads to comply with the standards may be certified in the same manner.G.7.1 Road WidthG.7.1.1 Roads accessing multiple lots (Multiple access roads)A driveable all-weather road surface width of 20 feet is required for an adequate twowayroadway to assure safe ingress and egress of emergency response vehicles.A narrower width for short distances, to minimize cut volumes or address otherenvironmental concerns, may be acceptable if adequate turnouts are incorporatedinto the design and the road design is demonstrated to be otherwise safe andmaintainable. The minimum acceptable width in these cases is 12 feet and mustincorporate appropriate turnouts as described in Section G.7.6.G.7.1.2 Roads accessing single lotsA driveable all weather road surface width of 12 feet is recommended to assure safeingress and egress of emergency response vehicles. To minimize cut volumes, or iftopography makes this width impractical, a narrower width, for short distances, maybe acceptable if the road design is demonstrated to be otherwise safe andmaintainable. The minimum acceptable width in these cases is 10 feet.G.7.1.3 Clearance heightAccess roads through forested areas must maintain proper clearance heights abovethe traveled way sufficient to allow passage of emergency vehicles. Tree branchesmust be trimmed to obtain a minimum overhead clearance of 13 feet 6 inches.Larimer County Rural Area Road Standards Page G-4October 22, 2007
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LARIMER COUNTYRURAL AREA ROAD STAND
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Table of Contents3.3.11 Typical Str
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Table of ContentsCHAPTER 8 - ENVIRO
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Table of Contents12.3.7.2 Conventio
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Table of ContentsG.7.12 Other Permi
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Chapter 1 - General InformationSect
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Chapter 2 - Submittal ProceduresSec
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Chapter 2 - Submittal ProceduresSec
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Chapter 3 - Submittal Requirements
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Chapter 4 - Road Design and Technic
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4.9.1.7 Design VehiclesChapter 4 -
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CHAPTER 5 - GEOTECHNICAL STANDARDS
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Chapter 5 - Geotechnical Standards
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Chapter 6 - STORMWATER MANAGEMENTSe
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Chapter 7 - Bridges and Major Drain
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Chapter 8 - Environmental and Agric
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Chapter 8 - Environmental and Agric
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9.1.3 DefinitionsChapter 9 - Roadwa
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CHAPTER 10 - ACCESS REQUIREMENTS AN
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Chapter 10 - Access Requirements an
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CHAPTER 11 - ACCESS AND UTILITY PER
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Chapter 12 - Right of Way Permittin
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Page 93 and 94: Appendix A - Definitions and Abbrev
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Page 97 and 98: APPENDIX B - REFERENCES AND RESOURC
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Page 132 and 133: Appendix F - Guidelines for Traffic
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Page 154 and 155: Appendix H - General NotesSection H
Page 162 and 163: APPENDIX I - VARIANCE REQUEST SUBMI
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LARIMER COUNTY RURAL AREA ROAD STANDARDS

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