Las Vegas

Major Traffic Alert, Southbound I-15 in Las Vegas to Close This Weekend for Tropicana Interchange Project

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Published on July 18, 2025
Major Traffic Alert, Southbound I-15 in Las Vegas to Close This Weekend for Tropicana Interchange ProjectSource: Unsplash/Zac Gudakov

Heads up, Vegas drivers: The Nevada Department of Transportation (NDOT) has issued a reminder about the upcoming full directional closure of southbound Interstate 15 (I-15) beginning this weekend from July 18 through July 21. This closure is part of the ongoing work for the I-15 Tropicana Interchange Project, which entails critical paving and striping efforts. Traffic will be impacted from 9:00 p.m. on Friday until the early hours of Monday at 5:00 a.m., specifically between Spring Mountain Rd and Tropicana Ave.

Given the substantial nature of these modifications, NDOT outlines several southbound ramp closures during the weekend: the Spring Mountain Rd, Flamingo Rd, and Harmon Ave on-ramps to southbound I-15 will be inaccessible. To bypass the closed section, motorists are advised to exit at Spring Mountain Rd off-ramp, take a detour south on Decatur Blvd, and merge back onto I-15 at the Tropicana Ave on-ramp. NDOT has planned this closure to cause the least disruption, but still, drivers may want to allow for extra travel time or find alternative routes.

The traffic adjustments keep rolling on Saturday, July 19, with more southbound I-15 ramp closures and lane restrictions in place from 1:00 a.m. to 5:00 p.m. The closures will affect the I-15 southbound collector distributor road from Sunset Rd to the I-215 Interchange, and the Tropicana Ave on-ramp to southbound I-15. Northbound travel will remain less inhibited, with four lanes open from I-215 to Sunset Rd. As for detours, officials suggest exiting at Spring Mountain Rd and taking Decatur Blvd to I-215 east to rejoin I-15.

According to NDOT, this weekend represents the final major closure for this project with subsequent work expected to have limited impact on traffic. The department stresses that these operations are weather contingent, as the paving process needs warm, dry conditions to be effective. Motorists are encouraged to exercise caution when navigating through work zones, and stay informed about the latest highway conditions through nvroads.com or by calling 511. NDOT also offers real-time traffic updates on their social media handles @NevadaDOTVegas and @nevadadot on various platforms.