A revised environmental assessment of a $269 million plan to expand and add new toll lanes on C-470 in south Denver is available for public review starting today and extends through Sept. 11.

The Colorado Department of Transportation and the Federal Highway Administration are proposing the highway’s expansion and have signed a “Revised Environmental Assessment” for the corridor.

The proposed plan would add one tolled express lane in each direction between I-25 and Kipling Parkway, and a second tolled express lane westbound between I-25 and Lucent Boulevard, and eastbound between Broadway and I-25.

Those new lanes, plus new auxiliary lanes where needed, would help relieve congestion on existing general purpose lanes, CDOT says. The project also includes pavement reconstruction, alignment improvements and direct-connect ramps at the C-470 and I-25 interchange.

The $269 million plan will have to be funded, at least in part, by private sources, officials have said.

The complete environmental assessment document is available at www.codot.gov. Comments can be submitted online.

A printed document is also available at several locations:

• Columbine Library, 7706 Bowles Ave., Littleton.

• Southglenn Library, 6972 S. Vine St., Centennial.

• Highland Ranch Library, 9292 Ridgeline Blvd, Highlands Ranch.

• Lone Tree Library, 8827 Lone Tree Parkway, Lone Tree.

• CDOT Headquarters, 4201 E. Arkansas Ave, Denver.

• CDOT Region 1, 2000 S. Holly, Denver

• Federal Highway Administration, 12300 W. Dakota Ave, Lakewood.

• Douglas County, 100 Third Street, Suite 220, Castle Rock.

A public hearing will be held Aug. 26 from 5-8 p.m. at the Lone Tree Arts Center, 10075 Commons St.

Monte Whaley: 720-929-0907, mwhaley@denverpost.com or twitter.com/montewhaley