4.4 SR 04-19-2021 - Laserfiche WebLink

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City of Elk River Design Standards Section 2000 — Street Design Standards Design Criteria 1. Minimum street grade of 0.50%, maximum street grade of 8.00% in accordance with City ordinance. Rural street sections require a minimum grade of 0.75% within 100 feet of low points. 2. Maximum slope of approach grade tangent at street intersections of 1.00% for 100 feet from the edge of the cross street. 3. Minimum intersection radii of 25 feet to back -of -curb. 4. Cul-de-sac entrance radii of 35 feet to back -of -curb. 5. Minimum grade for circumference of cul-de-sac is 0.50%. Horizontal and vertical curves should meet design standards detailed in the most current version of the MnDOT Roadway Design Manual for the corresponding design speed and roadway type. 7. Minimum design speed shall be 30 MPH unless otherwise approved by the City Engineer. 8. Cul-de-sacs shall have a diameter of 90 feet, face -of -curb to face -of -curb. 9. Urban (defined as those with public sewer and water systems) residential streets shall have 28" surmountable curb in accordance with Standard Plate No. 2000 and Standard Plate No. 2010. All other urban streets shall have B618 curb and gutter. B618 curb and gutter shall be constructed at all radii and catch basins with a ten -foot transition from surmountable curb to B618 curb and gutter. 10. Rural (defined as those without public sewer and water systems) residential streets, are allowed to follow design standards shown in Standard Plate No. 2011. This section allows the ability to create a less intensive section making use of roadside ditch for drainage management. 11. Street pavement sections shall be designed in accordance with the minimal thicknesses shown below: Local Residential Street Section 8" Aggregate Base, Class 5 21/2" Non -wear Course Mixture SPNWB230C 11/2" Wear Course Mixture SPWEA240C Local residential streets are defined as those expecting to serve less than 1,OOOvpd. All other streets shall be designed for 9-ton loading based on geotechnical evaluation of soil borings and the expected traffic demands. The minimum 9-ton section is as follows: 9-Ton Street Section 10" Aggregate Base, Class 5 21/2" Non -wear Course Mixture SPNWB330C 2" Wear Course Mixture SPWEB340C 12. Minimum street width shall be 32-feet face of curb to face of curb. All residential streets will be reviewed for possible widening based on their anticipated uses. 13. All urban commercial or industrial zoned streets and all urban collector and arterial streets shall © City of Elk River, Minnesota — All rights reserved 2