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State Highways

Studies & Assessments for State Highways
File 56th Avenue, Quebec St. to Havana St. Environmental Assessment
This Environmental Assessment (EA) identifies and evaluates the impacts of proposed multi-modal transportation improvements on 56th Avenue between Quebec Street and Havana Street in Denver, Colorado. The purpose of the proposed improvements is to meet forecast mobility and accessibility needs for users of all modes (including pedestrians, bicyclists, cars, buses, and trucks) on the existing 56th Avenue alignment. Keywords: Studies, State Highways
C-470 Environmental Assessment
The C-470 Environmental Assessment Document was signed by the Federal Highway Administration and the Colorado Department of Transportation in February 2006. Keywords: Studies, State Highways
File Eastern Colorado Mobility Study
April 2002 - The Eastern Colorado Mobility Study was undertaken to assist the Transportation Commission of Colorado in making investment decisions regarding infrastructure improvements to enhance freight mobility in a large part of the state. The study area includes all of eastern Colorado, extending to the I-25 corridor on the west and Colorado’s borders on the north, east and south. Keywords: Studies, Non-Highways
Ports to Plains
This study was a joint effort by four state Departments of Transportation (DOTs) including Colorado, Texas, Oklahoma, and New Mexico. It includes I-70 from I-25 east to US 40/287 and then south along US 40/287 to the Colorado/Oklahoma border. The purpose was to create a Development and Management plan for the Ports to Plains Corridor, which outlines a proposed plan for the corridor and serves as an essential tool for securing federal funding for corridor development. It contains several elements that improve the transportation network’s ability to move people and goods. Nearly 1,400 miles long, the corridor consists of 511 miles of 4- to 6-lane roadway, 755 miles of 2-lane roadway, and 113 miles of roadway in metropolitan areas. Keywords: Studies, US Highways, Interstates
SH 7, Cherryvale to 75th Street EA & FONSI
Environmental Assessment (EA) May 2008 - This Environmental Assessment (EA) evaluates the environmental, social, and economic impact of the proposed action for State Highway (SH) 7 between Cherryvale Road and 75th Street (approximately 2.2 miles). For this study, the lead federal agency is the Federal Highway Administration (FHWA) and the Colorado Department of Transportation (CDOT) is the applicant. This EA evaluates the impacts of the Preferred Alternative. This is compared against the No-Action Alternative. Finding of No Significant Impact (FONSI) October 2008 - SH 7 is a principal east-west arterial roadway serving as a commuter and intra-regional facility (see Figure 1-1 and Figure 1-2). To comply with the National Environmental Policy Act (NEPA), an Environmental Assessment (EA) was conducted to evaluate the reasonable alternatives that address the purpose and need for the project and assesses the impacts of implementing the proposed improvements. Two alternatives, the No-Action Alternative and the Preferred Alternative (build alternative) were evaluated in the EA. The build alternative was identified as the Preferred Alternative. Keywords: Studies, State Highways
SH 21 Powers Corridor Improvement Project - Colorado Springs
CDOT's Environmental Assessment for the proposed widening of Powers Boulevard is now nearly complete. The EA describes the Proposed Action and the effects it would have on social, economic and environmental resources in the Colorado Springs Metropolitan area. The EA is scheduled for completion and release for public comment in the spring of 2010. Be sure to check this web site to learn when the document will be made available online. Keywords: Studies, State Highways
SH 82 Grand Avenue Bridge
The Colorado Department of Transportation has started work to address the functional, structural & safety deficiencies of the Grand Avenue Bridge and bring it up to current standards for a four-lane bridge. Keywords: Studies, State Highways
SH 133 Carbondale Access Control Plan
The SH 133 Carbondale Access Control Plan will assess the existing and proposed access points along SH 133 within the study area and make recommendations for future changes if appropriate. Keywords: Studies, State Highways, Access Control Plan
SH 392 Access Control Plan
October 2006 - Recent and continued growth in along Interstate (I) 25, State Highway (SH) 392, and within the local communities that make up the North Front Range, has resulted in an increase in traffic on the SH 392 corridor. Traffic volumes in the area are expected to at least double in the next 20 years. Without changes to the corridor, this increase in traffic volumes will result in increased delay, higher levels of congestion, and an increase in the severity and number of accidents. The Colorado Department of Transportation (CDOT) has identified the need for an Access Control Plan (ACP) on this corridor to minimize the occurrence of these conditions. Keywords: Studies, State Highways, Access Control Plan
SH 392 Environmental Overview Study (EOS)
The desired outcome of the EOS is to identify a transportation solution that has the support of local and regional planning partners, and which identifies ROW that must be preserved for those improvements. This plan would then be used by planners to set aside ROW as development occurs along the corridor. The SH 392 EOS study limits are from SH 287 on the west to Weld County Road (WCR) 23 on the east. Keywords: Studies, State Highways
SH 402 EA and FONSI
Environmental Assessment (EA) - July 2007 and Finding of No Significant Impact (FONSI) - January 2008- encompasses the 4-mile length of SH 402 although improvements are not needed for the area between SH 287 and CR 13C (St. Louis Avenue), which was widened by developers in coordination with the city of Loveland and the Colorado Department of Transportation (CDOT) under a Categorical Exclusion (CE). Keywords: Studies, State Highways
File SH 42 Planning and Environmental Linkage Study (PEL)
The 42 Gateway Project is an infrastructure improvement study that seeks to influence the form, function, character, and accessibility of the Highway 42 Revitalization Area and Downtown Louisville. The Project was a joint effort between the City of Louisville (the City), Boulder County, the Regional Transportation District (RTD) and the Colorado Department of Transportation (CDOT). Keywords: Studies, State Highways, PEL
File SH 60 Access Control Plan
Access control plan was conducted in coordination with the SH 60 Environmental Overview Study. Keywords: Studies, State Highways, Access Control Plan
File SH 60 Environmental Overview Study
The Colorado Department of Transportation (CDOT), Region 4, initiated an Environmental Overview Study (EOS) to evaluate the transportation needs along State Highway 60 (SH 60) from I-25 to Two Rivers Parkway in Weld County. Keywords: Studies, State Highways
SH 79 and Kiowa-Bennett Corridor Planning and Environmental Linkage Study
The Town of Bennett, in partnership with Adams and Arapahoe Counties and the Colorado Department of Transportation, recently completed a detailed transportation study of the State Highway (SH) 79 and Kiowa-Bennett Road corridors around the Bennett area, north and south of I-70. Keywords: Studies, State Highways, PEL
File SH 83/86 Corridor Optimization Plan
September 2004 - The Corridor Optimization process was created to develop specific corridor visions which are consistent and compatible with local plans and are supported by affected local governments and regional agencies. Officially adopted by the Colorado Department of Transportation in 2001, the Corridor Optimization Guidelines were developed to provide input to the regional transportation planning process by providing an assessment of how to best meet future travel demands on a given corridor. 213MB Keywords: Studies, State Highways
State Highway 7 (Arapahoe Road) Environmental Assessment
State Highway (SH) 7, also known as Arapahoe Road, between Cherryvale Road and 75th Street is a major transportation corridor which serves the cities of Boulder, Lafayette, Louisville, and Erie as well as Boulder County. The Colorado Department of Transportation (CDOT) in conjunction with the Federal Highway Administration (FHWA) conducted an Environmental Assessment (EA) of this corridor to determine possible transportation alternatives. Keywords: Studies, State Highways
State Highway 7 Planning and Environmental Linkage Study
CDOT is conducting a Planning and Environmental Linkage Study (PEL) to look at improving conditions on State Highway 7 (SH 7) from U.S. 287 in Lafayette to U.S. 85 in Brighton. Keywords: Studies, State Highways
State Highway 9 Frisco to Breckenridge
The Colorado Department of Transportation (CDOT) is widening State Highway (SH 9) corridor from two to four lanes. This will increase safety and mobility of drivers, transit, pedestrians and bicyclists. Improvements have been steadily taking place since the SH 9 Environmental Impact Statement and Record of Decision have been signed by CDOT and the Federal Highway Administration (FHWA). Keywords: Studies, State Highways
State Highway 60 Environmental Overview Study
The purpose of the State Highway 60 Environmental Overview Study (SH 60 EOS) is to identify the safety and mobility improvements necessary to address the future travel demand within the SH60 corridor for the year 2030 and to provide an overall strategy for CDOT and the local jurisdictions for right of way preservation and access control necessary to allow the future implementation of improvements with respect to changes in land use and rapid development along the corridor. Keywords: Studies, State Highways
Document Actions
EA Available for Public Comment

The North Meadows Extension to US 85 and I-25 Environmental Assessment (EA) has been signed and released for public comment.  The project is sponsored by the Town of Castle Rock and Douglas County and includes a new interchange on both US 85 and I-25.  You can download and find locations to view the the EA at www.crgov.org/nme or you can also view the document at one of CDOT's locations: Region 1 HQ 18500 East Colfax Ave, Aurora, CO. 80011 -or- Arapahoe Residency 7328 S. Revere Pkwy, Suite 204A, Centennial, CO. 80112.