Design Standards

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Yellow Explanation Point.png Weber County design standards for all public infrastructure installation, improvements and repairs in unincorporated Weber County areas, excluding all utilities or infrastructure not serviced or maintained by Weber County.

Please note: You may visit the Building Inspection site for building design criteria.


Public Works Standards and Specifications Manual (18 MB) which is Published by Weber County Engineering Department. This manual is currently used in addition to the APWA 2012 Manual of Standard Plans and Manual of Standard Specifications until the APWA Plans and Specs are adopted with an updated County amendment.


For standards for improvement, installation, or repair of utilities or infrastructure not serviced or maintained by Weber County, please contact the applicable company or governing entity. Some utility company contact information is available on the Utility Listings page.

Storm Water Runoff Design

Condition Requirement

Small watersheds of 30 acres or less

Rational Method

Small or large watersheds SCS Curve number method and SCS Unit Hydrograph method[1]
Precipitation return periods initial collection and conveyance 10 year[2]
Major collection of multiple initial systems 100 year[2]
Conveyance of rivers, streams, or any large drainage 100 year or maximum
Maximum post development runoff 0.1 cfs/acre[1]
  1. 1.0 1.1 Or as approved by the county engineer
  2. 2.0 2.1 Precipitation estimates may be found on the NOAA website. You may also want to visit the USGS Site for a very useful tool.

Note: The rainfall intensity varies greatly within the county, so multiple durations will be required to be checked. Check the 1, 3, 6, 12, and 24 hour intensities and use the most restrictive result.

Road Section

  • Asphalt thickness shall not be less than 3 inches.
  • A minimum of 8” of 4” minus sub-base and 6” road-base.
  • Compaction test will be required for the base and sub-base.

Standard Rural Roadway Section

Street Designation R.O.W. Width Surface Course Width Shoulder Width
Minor and/or Private Roadways[1] 50' 24' 4'
Standard Residential 60' 24' 4'
Collector 66' 28' 5'
Minor Arterial[2] 80' 44' (30')[3] 4'[3]
Major Arterial[2] 100' See county engineer for specific requirements
Rural Footnotes:
  1. Minor street permitted upon special permission by the county planning commission. Where sidewalk is necessary, must have 60' R.O.W.
  2. County engineer shall provide pavement design on arterial streets - width may vary per county engineer.
  3. This width may be used at the direction of the county engineer when full width asphalt paving is not necessary.


Standard Urban Roadway Section

Street Designation R.O.W. Width T.B.C. to T.B.C.[1] Centerline to T.B.C
Minor Roadways 50' 31' 15.5'
Standard Residential 60' 41' 20.5'
Collector 66' 47' 23.5'
Minor Arterial[2] 80' 61' 30.5'
Major Arterial[2] 100' 80' 40.5'
Urban Footnotes:
  1. Maximum difference in elevation between curbs on opposite side of street shall not exceed 1'=0"
  2. On arterial streets the county engineer will provide a pavement design. Location of sidewalk and curb & gutter may vary on individual arterial streets per direction of the county engineer.

Plan and Drawing Review and Standards

  • Prior to submitting any plans for development, contact should be made with the Weber County Planning Department to ensure all planning requirements are met and that the plan review process is as speedy and smooth as possible.
  • Generally, all development plans are submitted directly to the Planning Department. The Planning Department in turn distributes copies of these plans to the Surveying, Engineering, Health departments, and the Fire Marshal for review. Comments from review are submitted to the Planning Director or, in most cases, the applicable Planning Commission.
  • General engineering review checklists for plan and drawing submittal can be viewed here. The checklist summarizes a simplified review outline put together by the Weber County Engineering Department. The checklist is based on adopted Weber County Standards and Ordinances and should not be considered all inclusive.
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