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Construction BMP Guide: C107 Construction Road/ Parking Area Stabilization

Roads and parking areas shall be stabilized wherever they are constructed, whether permanent or temporary, for use by construction traffic. Stabilizing roads, parking areas, and other on-site vehicle transportation routes immediately after grading reduces erosion caused by construction traffic or stormwater runoff. 

*The contents of this guide are to provide a general overview only. It is the users responsibility to ensure all BMPs utilized on their project meet the requirements of their state and local jurisdictions.

Truck driving down a gravel construction road

Find it in the Stormwater Management Manual:
Eastern WA          Western WA

Heavy equipment driving and working from a stabilized construction road


  • On areas that will receive asphalt as part of the project, install the first lift as soon as possible 
  • Install 6 inch depth of 2-4 inch crushed rock, gravel base, crushed surfacing base course immediately after grading or utility installation. A 4 inch course of asphalt treated base may also be used, or the area may be paved.  
  • Roadways should be carefully graded to drain into drainage ditches directed into a sediment control bmp 
  • In some cases roadways can drain into an area of > 50feet of heavy vegetation.  
  • Protect storm drain inlets from sediment laden water 
Birds eye view of construction site with equipment parked on gravel areas
Credit: MoDOT, CC BY-NC-SA 2.0 , via Flickr


  • Inspect stabilized areas regularly, especially after large storm events 
  • Crushed rock, gravel base, etc., shall be added as required to maintain a stable driving surface and to stabilize any areas that have eroded 
  • Following construction, these areas shall be restored to preconstruction condition or better to prevent future erosion.  
  •  Perform street cleaning on paved areas at the end of each day or more often if necessary