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I-15 / Tropicana Interchange

The Nevada Department of Transportation's rebuild of the I-15 and Tropicana interchange is complete, with a ribbon cutting on September 23, 2025. Kiewit Infrastructure West was the general contractor and the final cost was $382M.

CompleteRoadsSouth StripReviewed Aug 31, 2026
A curving elevated highway ramp under construction on concrete columns
Illustrative photograph, not a photograph of this project. Building Las Vegas labels every illustration and rendering; site photographs in our archive are dated and credited.
Owner
Nevada Department of Transportation
General contractor
Kiewit Infrastructure West, with 42 subcontractors
Reported cost
$382M final
Scope
Raised and widened the Tropicana bridge to four lanes in each direction
Status
Complete; ribbon cutting September 23, 2025
Type
Roads
Area
South Strip
Target opening
Sep 2025

Where it stands

The project is complete. The ribbon cutting was held Tuesday, September 23, 2025, about three and a half years after construction started (Las Vegas Review-Journal; KTNV).

The final cost was $382M (Las Vegas Review-Journal). Kiewit Infrastructure West was the general contractor with 42 subcontractors, and the work raised and widened the Tropicana bridge to four lanes in each direction (KTNV). Tropicana Avenue itself reopened around May 1, 2025 (News3LV).

What is not known

The sources we have do not break down what drove the final $382M cost relative to the original contract award, so no change-order history can be reported (Las Vegas Review-Journal). No approval actions or case numbers appear in the sources we have.

Why it matters

This interchange carries the traffic that now has to absorb a 33,000-seat ballpark and a phased Bally's redevelopment on the same corner, so its capacity is the baseline those projects are planned against. With 42 subcontractors under one prime, it is also the largest recent record of local heavy-civil subcontract participation.

Timeline

  1. Construction started

    Work began on the interchange.

  2. Tropicana Avenue reopened

    The avenue reopened to traffic.

  3. Ribbon cutting

    The project was completed after roughly three and a half years.

Sources

  1. Las Vegas Review-Journal - completion of the I-15 and Tropicana projecthttps://www.reviewjournal.com/local/traffic/lombardo-speaks-on-completion-of-i-15-tropicana-project-watch-live-3464556/
  2. KTNV - officials cut ribbon on the I-15 and Tropicana interchangehttps://www.ktnv.com/traffic/state-and-local-fficials-cut-ribbon-on-i-15-and-tropicana-interchange
  3. News3LV - Tropicana Avenue reopenshttps://news3lv.com/news/local/tropicana-avenue-at-i-15-reopens-in-las-vegas-completing-years-of-work

Every figure on this page is attributed to a document or a published report. Where sources disagree we print both numbers rather than choosing one. Where the record is silent we say so.

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