The Utah Department of Transportation (UDOT), in cooperation with Payson City, is preparing an Environmental Impact Statement (EIS) that evaluates the interchange at Main Street (SR-115) and I-15. This study analyzes transportation conditions and recommends potential solutions to meet current and future needs.
The project team published a Draft EIS on September 29, 2017, which is available for review on the Draft EIS page of this site (Click on the Draft EIS tab). The Draft EIS identifies Alternative C1: Braided Ramps as the Preferred Alternative. This recommendation is based on analysis of No-Build Alternative and the six build alternatives previously proposed by the study, and included a review of traffic performance; impacts to key resources; community and economic considerations; cost; regulatory requirements and issues; and input from government agencies and the public. More information about the preferred alternative and the Draft EIS can be found by reviewing the Story Map, which provides an overview of the document (Click here).
A 45-day public comment period followed the publication of the Draft EIS. After the comment period, the project team considered and responded to comments received from members of the public and regulatory agencies. As the next step in the environmental process, the project team received comments from UDOT’s legal team during a legal sufficiency review. The number of comments received was higher than originally predicted which will result in a delay to the project schedule. The project team is currently developing a strategy to address these comments to ensure that the final document is legally defensible. Due to this delay, the Final EIS anticipated to be completed in early 2019, with a Record of Decision issued in mid 2019.
Contact the study team with any questions or concerns via email at or phone at (801) 859-3770.
Pursuant to 23 United States Code (USC) 327, the Utah Department of Transportation (UDOT) has assumed the Federal Highway Administration's (FHWA) responsibilities under the National Environmental Policy Act of 1969 (NEPA), and all or part of the US Department of Transportation's Secretary's responsibilities for environmental review, consultation, or other actions required or arising under Federal environmental laws, with respect to the review or approval of highway projects within the State. These responsibilities have been assigned in the Memorandum of Understanding between the FHWA and the UDOT concerning the State of Utah's Participation in the Surface Transportation Project Delivery Program Pursuant to 23 USC 327, executed on January 17, 2017.
Pursuant to UDOT's Application to Assume FHWA's NEPA Responsibilities, UDOT has assigned a Signatory Official from outside Environmental Services to ensure independent environmental decisions. The Signatory Official is responsible for signing Environmental Assessment decision documents, Draft and Final Environmental Impact Statements (EISs), Record of Decisions (RODs), and combined Final EIS/RODs. The UDOT Deputy Director is the Signatory Official responsible for signing the environmental documents stated above.


Below is UDOT's estimated timeline for the EIS process.


Late 2014


Early 2015

Identify and gather public input regarding items to consider in the environmental study.


Mid 2015 to Summer 2017

Screen alternatives based on their potential impacts and how they meet the purpose and need statement; gather public input on the alternatives and the analysis metrics.

Draft EIS Published

Fall 2017

Report findings and present Locally Preferred Alternative.


Fall 2017

Members of the public invited to provide comments on the DEIS, review the document, and have questions answered by the project team.


Fall 2017

This period extends a minimum of 45 days after the release of the DEIS, providing members of the public the opportunity to submit comments in response to the DEIS via mail, email, or other means.


Early 2019

The final EIS includes responses to all comments received for the DEIS, including feedback from agencies, key stakeholders, and the public. There will be public comment period following the publication of the final EIS.


Mid 2019

The Record of Decision is UDOTs final decision regarding the project. It also identifies mitigation requirements and other commitments.

The schedule has been revised throughout the course of this study. This timeline reflects the most current plan.
Current Phase
* Public Meeting and Review Period