Colorado Public Works Journal, Fall/Winter 2022

56 Colorado Public Works Journal CDOT Bob Wilson Construction on the Colorado Department of Transportation’s $419 million Interstate 25 South Gap Project between Castle Rock and Monument is complete, providing increased safety and mobility for the approximately 75,000 vehicles traveling that segment of highway every day. When work began on the 18-mile stretch of I-25, known as "The Gap” in September 2018, it was the only remaining four-lane segment of interstate connecting Colorado Springs and Denver, the state’s two largest cities. By December 2021, CDOT delivered increased safety and mobility nearly a year early when traffic was placed into its final configuration, with two general purpose lanes and one Express Lane in each direction. The last year of construction included paving, striping, and the installation of deer guard (like cattle guard), guardrail, and landscaping. Other improvements included: • Widening shoulders along the entire length of the project in both directions • Rebuilding four bridges (Spruce Mountain Road, Plum Creek, Upper Lake Gulch, and Greenland) • Interchange reconstruction and bridge widening at County Line Road • Paving all lanes for a smoother riding surface • Building four new wildlife crossings and installing 28 miles of deer fencing, expected to reduce wildlife-vehicle collisions by 90% • Constructing a southbound truck climbing lane from Greenland Road over Monument Hill and new chain up station near Larkspur • Adding an additional lane on northbound I-25 over Monument Hill and eliminating the left lane merge at CO 105 • Modernizing communications and power along the corridor to enable future advanced technology • Installing tolling infrastructure In addition to the state, funding for the project came from Douglas and El Paso counties, the Pikes Peak Rural Transportation Authority, and from a federal Infrastructure for Rebuilding America grant. Tolls remain temporarily waived while testing of the Express Lanes continues through spring 2023. Kraemer North America was the project’s prime contractor. Bob Wilson is CDOT’s Statewide Communications Manager and can be reached at I-25 South Gap Project completed on-time and on-budget