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City of Elk River Design Standards <br />Section 2000 — Street Design Standards <br />Design Criteria <br />1. 1��inimum street grade of 0.50%, ma�imum street grade of 8.00% in accordance with City <br />ordinance. Rural street sections require a minimum grade of 0.75% within 100 feet of low points. <br />2. Ma�imum slope of approach grade tangent at street intersections of 1.00% for 100 feet from the <br />edge of the cross street. <br />3. Minimum intersection radii of 25 feet to back-of-curb. <br />4. Cul-de-sac entrance radii of 35 feet to back-of-curb. <br />5. 1��inimum grade for circumference of cul-de-sac is 0.50%. <br />6. Horizontal and vertical curves should meet design standards detailed in the most current version <br />of the MnDOT Roadway Design Manual for the corresponding design speed and roadway type. <br />7. Minimum design speed shall be 30 MPH unless otherwise approved by the City Engineer. <br />8. Cul-de-sacs shall ha�re a diameter of 90 feet, face-of-curb to face-of-curb. <br />9. Urban (defined as those with public sewer and water s�stems) residential streets shall ha�-e 28" <br />surmountable curb in accordance with Standard Plate No. 2000 and Standard Plate No. 2010. <br />All other urban streets shall have B618 curb and gutter. B618 curb and gutter shall be <br />constructed at all radii and catch basins with a ten-foot transition from surmountable curb to <br />B618 curb and gutter. <br />10. Rural (defined as those without public sewer and water systems) residen�ial streets, are allowed to <br />follow design standards shown in Standard Plate No. 2011. This section allows the abiliry to <br />create a less intensive section making use of roadside ditch for drainage management. <br />11. Street pavement sections shall be designed in accordance with the minimal thicknesses shown <br />below: <br />Local Residential Street Section 8" Aggregate Base, Class 5 <br />2'/z" Non-wear Course Mixture SPNWB230C <br />1'/Z" Wear Course Mixture SPWEA240C <br />Local residential streets are defined as those expecting to serve less than 1,OOOvpd. All other <br />streets shall be designed for 9-ton loading based on geotechnical evaluation of soil borings and <br />the expected traffic demands. The minimum 9-ton section is as follows: <br />9-Ton Street Section 10" Aggregate Base, Class 5 <br />2'/z" Non-wear Course Mixture SPNWB330C <br />2" Wear Course Mixture SPWEB340C <br />12. Minimum street width shall be 32-feet face of curb to face of curb. All residential stYeets will be <br />reviewed for possible widening based on their anticipated uses. <br />13. All urban commercial or industrial zoned streets and all urban collector and arterial streets shall <br />OO City of Elk River, Minnesota — All rights reserved 2 <br />