Mary Carter Greenway Trail Updates

Beginning in July, the Mary Carter Greenway Trail will have intermittent FULL CLOSURES under the South Platte River Bridge for the replacement of the existing east and westbound bridges as part of the C-470 Express Lanes Project.

During FULL CLOSURES, trail detour information will be given HERE.

Unless noted above, the trail will be open and available to use. While work is being performed under the South Platte River Bridges and when a full closure is not required, flaggers may be present to guide trail users safely through the work zone. Please be cautious and obey flagger instructions.

C-470 Express Lanes

express lanes

The C-470 Tolled Express Lanes project held a bid opening on Wednesday, March 30, 2016, at CDOT Headquarters. At that time, the apparent selected proposer, based on a best value determination, was found to be Flatiron AECOM LLC. View the bid opening spreadsheet, with technical scores and price.


The C-470 Tolled Express Lanes Segment 1 project will be constructed, managed, owned, and operated by CDOT. The project is supported by the C-470 Corridor Coalition, and Douglas County is providing CDOT partial funding.

Funding all the scope items listed below for Segment 1 is contingent upon net proceeds from toll revenue projections, combined with RAMP funds and other revenue sources.

  • Adding two express lanes westbound from I 25 to Colorado, one tolled express lane between Colorado and Wadsworth westbound, and one tolled express lane eastbound from Platte Canyon Road to I 25.
  • Full reconstruction of the existing pavement.
  • Adding auxiliary lanes at selected locations.
  • Improving on-ramps and off-ramps to current standards (including ramp metering where appropriate), and including construction of direct-connect ramps to the westbound managed tolled lanes to accommodate traffic from I 25 northbound and southbound, and from E 470.
  • Realigning substandard curves.
  • Safety and operational improvements between I-25 and Quebec.
  • Widening of existing bridges throughout the project area.
  • Replacing the bridges over the South Platte River.
  • Installing water-quality features designed to current standards.
  • Installing noise barriers where required.
  • Installing ITS elements and tolling equipment.
  • Installing the appropriate signing and striping required for the proposed corridor improvements.

Additionally, the project includes adding grade separations for the C-470 multi-use trail at Colorado Boulevard and Quebec Street, where grade separations are required at the off-ramp, on-ramp and under Quebec Street.

HOV Lanes

There will be no HOV/carpool lanes within the C-470 corridor. The C-470 Express Lanes project will add Express Lanes in addition to the existing, free general-purpose lanes. Drivers will always have a choice of using the free existing lanes or paying a toll to use the Express Lane.

Find lane closure information any time.

Colorado: The Official State Web Portal