The I-15 Tropicana Interchange project, previously referred to as the “I-15/Tropicana Interchange and Harmon High Occupancy Vehicle (HOV) Ramp and Hacienda HOV Ramp Project” is a joint effort project sponsored by NDOT, the Regional Transportation Commission of Southern Nevada (RTC) and the Federal Highway Administration (FHWA).

As part of the National Environmental Policy Act (NEPA), NDOT and the FHWA prepared an Environmental Assessment for the Tropicana Interchange project. In February 2020, the FHWA determined that the project would have no significant environmental impacts.

In November 2021, the NDOT Board of Directors selected Kiewit Infrastructure West Co. as the design-builder for the project.