Interstate 515

Interstate 515 (I-515) was a 20.540-mile-long (33.056 km) spur route of I-15 in the US state of Nevada that ran from the junction of I-15, US 93 and US 95 (the Las Vegas Spaghetti Bowl Interchange) in Downtown approximately 20 miles (32 km) southeast to just north of Railroad Pass in southeastern Henderson. The freeway connected traffic headed from Boulder City and Henderson to Downtown Las Vegas via a direct, high-speed route and it ran concurrently with, US 93, and US 95 along its entire length.

The I-515 designation was first approved on July 12, 1976, but construction did not begin until 1982, and was constructed in stages until it reached its former terminus north of Railroad Pass in 1994, when signs of the designation finally were put up. I-515 was built to bypass Fremont Street and Boulder Highway, both of which were former alignments of US 93, US 95, and US 466, and provide a direct freeway connection with Henderson.

On August 16, 2017, the segment of I-515 between the I-215 interchange and the southern city limits of Henderson was re–designated as I-11. The Nevada Department of Transportation announced on July 27, 2022 that part of the preferred alternative for the future northward extension of I-11 would follow the remainder of the I-515 alignment. Signs for I-11 and US 95 north of I-15 began to go up on May 21, 2024 by NDOT and the I-515 designation was decommissioned after the American Association of State Highway and Transportation Officials (AASHTO) approved the I-11 designation in October 2022 along with the Federal Highway Administration (FHWA) on November 24, 2023.