Interstate-19 East Frontage Rd: Canoa to Continental

This project included the construction of 4.5-miles of a two-lane frontage road along Interstate-19 (I-19) between Canoa Road and Continental Road in Green Valley, Arizona.

Major improvements included new frontage road bridge structures and an innovative braided ramp at the Continental Road interchange to create a single intersection of northbound I-19 access ramps, I-19 frontage road, and Continental Road.

The use of micropiles allowed Continental Road to be widened under the existing I-19 bridge while not adversely impacting and the existing structure and and/or traffic flows.  Using a phased construction approach, the existing slope pavement was removed and replaced with concrete retaining walls.

Project Recognition/Awards:

  • 2011 Number 2 – Top Ten Roads, presented by Roads & Bridges Magazine
  • 2012 Public Works Project of the Year, presented by Arizona Chapter – American Public Works Association (APWA)

Project Details

Location: Green Valley, Pima County, Arizona
Initial Bid: $14.9 M
Construction Cost: $14.3 M
Owner: Pima County, Department of Transportation
Project Delivery: DBB
Scope: Four separate bridge structures including a braided ramp overpass onto I-19


  • 4 Bridge Structures
  • Widening of Continental Road (under existing I-19 bridge)
  • Grouted Micropiles
  • 41,619 SF of Concrete Retaining Wall
  • 60,100 CY of Excavation
  • 13,443 CY of Borrow
  • 19,027 CY of ABC
  • 758 SY of PCCP
  • 32,521 TONS OF AC
  • 1,115 LF of 18″-66″ CMP
  • 3,592 LF of 18″-48″ RCP
  • 5 EA RCBC
  • 39 Catch Basins
  • 1,276 of 48″-60″ Drilled Shaft Foundation
  • 11,555 LF of Concrete Curb
  • 2,569 LF of Concrete Barrier
  • 4,135 CY of Riprap
  • 1,785 SY of Slope/Median Paving
  • Traffic Signal
  • Landscaping/Irrigation