SR-20, Fredonia to I-5 Widening, Stage 2

Project Summary

This project provided traffic congestion relief at the SR-20 and Interstate 5 interchange in Washington State. Improvements were made to the traffic crossings on SR-20 west of Burlington and the major highway was widened from two to four lanes for six miles. The north and southbound Interstate 5 on-ramps and off-ramps were reconstructed and realigned.

The project achieved substantial completion one year ahead of schedule and was a huge success and excellent partnership between IMCO and WSDOT.

IMCO Self-Performed Scopes of Work:

  • 51,000 cubic yards of roadway excavation
  • 400,000 tons of import gravel
  • 78,000 tons of crushed surfacing base course
  • 2 concrete girder bridges
  • 18,600 lineal feet of storm sewer
  • 11,650 lineal feet of water main
  • 89,000 tons hot-mix asphalt paving
  • 59 acres of clearing and grubbing



Burlington, WA


Washington State Department of Transportation

Contract Amount

$30 Million


May 2008 - October 2009

Project Highlights

The project received excellent site reviews from Washington state agencies for storm water permit compliance inspections.