I-15 / Tropicana Interchange
Feasibility Study

Study Process Used

Throughout the study, we have looked for ways to improve the safety, accessibility and reliability of Tropicana and I-15 in this area. With these goals in mind, the study is now complete. During the study, we utilized decision stop points in our decision making process. These decision stop points were reached during development of concepts as well as during the screening process. At each stop point, the analysis results and recommendations for proceeding were presented to the project team.

The study process included an extensive screening and evaluation of alternatives process. As potential improvements for the interchange were developed they were screened by determining how each improvement met the goals of the project. The screening criteria included NEPA ACTION, OPERATIONS, SAFETY, ACCESSIBILITY, RELIABILITY and IMPLEMENTABILITY. The screening process is a tiered approach that narrows down more promising alternatives so they can be reviewed in greater detail.

Screening Criteria

  • NEPA Action: refers to the anticipated NEPA action of the specific concept
  • Operations: refers to the anticipated or modeled traffic operations
  • Safety: refers to the ability for users of the system to reach their destination safely
  • Accessibility: refers to the ability to connect people to desired destinations
  • Reliability: refers to the ability to meet anticipated needs/demand and flexibility
  • Implementability: refers to the cost and scale of improvements versus impact to surrounding or future infrastructure


The project is currently between the Planning and NEPA processes: