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Improving66 FACTS

Phase I of the Improving 66 project was funded through the American Recovery and Reinvestment Act.  The project widened State Route 66 in Sevier County from just north of Nichols Street to Boyds Creek Highway from 4 lanes to 6 lanes in each direction.

  • Total project length:               4.189 miles
  • Completed:                           November 2011         
  • Estimated Cost:                    $38.6 million
  • Contract Awarded:                 July 8, 2009
  • Work Began:                        July 15, 2009
  • All lanes opened November 18, 2011 (12 days early and just in time for the Thanksgiving holiday weekend)


Phase II of the Improving 66 project will widen State Route 66 in Sevier County from State Route 139 (Douglas Dam Road) to just south of the I-40 Interchange from 4 lanes to 6 lanes in each direction.

  • Total project length:               1.951 miles
  • Completion:                           November 2012
  • Estimated Cost:                     $23.3 million
  • Contract Awarded:                 August 2010
  • Work Began:                         September 2010

Phase III: of the Improving 66 project widened State Route 66 in Sevier County from State Route 338 (Boyds Creek Highway) to State Route 139 (Douglas Dam Road) from 4 lanes to 6 lanes in each direction.:

  • Total project length:       2.223 miles
  • Estimated Completion:  October 2014
  • Estimated Cost:            $32.5 million
  • Contract Awarded:         February 2012
  • Work Began:                 March 2012

Phase III: Materials Placed on Site to Date: Some quick facts about what the contractor has placed so far (through November 20, 2013):

  • 116,353 cubic yards of dirt moved on the site equaling around 11,635 truck loads
  • 24,856 tons of graded solid rock to plug sinkholes and bridge over weak subgrade soils
  • 2,382 cubic yards of concrete used for the concrete box culvert extension and bridge construction
  • 446, 299 pounds of steel bar reinforcement used for the concrete box culvert extension and bridge construction
  • 9771 feet of new storm drain pipe installed

I-40 Exit 407 Diverging Diamond Interchange Project