I-25 North Forty

The North Forty transportation project on Interstate 25 encompasses 14 miles of the state’s high-priority transportation projects, as well as an Environmental Impact Study (EIS) of an additional 26 miles of highway.

Construction projects along this corridor have and will include interchange reconstruction, highway widening and capacity improvements that will accommodate multi-modal transportation improvements well into the future. Currently no construction is underway.

Completed Projects: 

• ($73 M, included all costs)
  Widened approximately seven miles of I-25 from just south of SH 7 to SH 52 and reconstructed the Weld County Road 8 interchange. The Union Pacific Railroad overpass was also removed and the frontage roads were widened. Construction began in late November 2001 and was completed in early 2005.
• ($36 M, does not include design, right-of-way, environmental or utilities)
  Widened I-25 from four to six lanes between State Highway (SH) 52 and SH 119. Construction began in November 2006 and continued through June 2009.
• ($48.6 M)
  Widened I-25 from four to six lanes between SH 66 and SH 119 and replaced five bridges including the I-25 bridges over the St. Vrain River and Weld County Rd. 28 and the SH 66 bridge over I-25. Construction began in September 2007 and was completed in July 2009. 

Environmental Impact Study

The Colorado Department of Transportation (CDOT) is aware of the issues facing Northern Colorado in the coming years and is taking a proactive approach to study what options are available for addressing the future transportation needs of the region.

The study area for the North I-25 EIS is large, spanning from the US 287 and Burlington Northern Santa Fe Railroad corridor on the west to the US 85 and Union Pacific Railroad corridor on the east; from Denver Union Station on the south to State Highway 1 and the Fort Collins/Wellington area on the north. The southern boundary includes Denver Union Station in order to effectively evaluate the use of passenger rail or other transit options in the region.

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