I-70 Floyd Hill National Environmental Policy Act Process

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Finding of No Significant Impact

On Jan. 12, 2023, CDOT and the Federal Highway Administration (FHWA) signed a Finding of No Significant Impact (FONSI) for the I-70 Floyd Hill to Veterans Memorial Tunnels Project (Project). The FONSI completes the NEPA phase of the Project. The FONSI selects the design alternative for this Project (which is based on refinements to the Preferred Alternative identified in the Environmental Assessment), describes the refined project design to the Environmental Assessment alternative and provides information on the next steps. CDOT is moving forward with construction of the Project, continuing to work with its Context Sensitive Solutions stakeholder teams.

Finding of No Significant Impact

Finding of No Significant Impact January 2023
FONSI Appendix A: Design Refinements
FONSI Appendix B: Mitigation Commitments
FONSI Appendix C: Comments
FONSI Appendix D: EA Documents
Air Quality Technical Report Addendum
State Air Quality Technical Report 4b-21912 Floyd Hill State AQ Technical Report
Section 4(f) Resources Technical Report
Visual Impact Assessment Technical Report
Wetlands and Aquatic Resources Delineation

Environmental Assessment

In August, 2021, CDOT released an Environmental Assessment (EA) detailing our preferred plan for highway and other improvements to I-70 between Floyd Hill, west of Evergreen, through the Veterans Memorial Tunnels to the eastern edge of Idaho Springs. During the 60-day EA comment period, CDOT hosted a virtual public engagement event to explain the Project, its impacts, mitigation commitments, and next steps, and provide an opportunity for public and agency comments. CDOT received comments from members of the public and from Clear Creek County and the US Environmental Protection Agency.

Since the EA was released, CDOT released Requests for Proposals for design and construction consultants under a Construction Manager/General Contractor (CMGC) delivery method and selected Kraemer North America as the Construction Manager and Atkins as the Designer. The CMGC team reviewed and refined the EA Preferred Alternative in an exhaustive design innovation process with the Project Leadership Team, Technical Team, and Issue Task Forces. As a result, the design has been modified, and a Refined Preferred Alternative has been developed and endorsed. CDOT and FHWA formally selected the Refined Preferred Alternative in the EA decision document. The decision document, describes the Refined Preferred Alternative, compares its impacts to those of the EA Preferred Alternative, and provides information on the next steps for design and construction of this important Project.

Environmental Assessment

Environmental Assessment July 2021
EA Appendix A: Technical Reports
EA Appendix B: Mitigation Tracking
EA Appendix C: Correspondence

I-70 Floyd Hill National Environmental Policy Act Documents

I-70 Genesee Wildlife Crossing Categorical Exclusion
US 40 Roundabouts Categorical Exclusion