Pennybacker Bridge, Through-arch road bridge over Lake Austin in Austin, Texas, United States

The Percy V. Pennybacker Jr. Bridge carries Loop 360 across Lake Austin on a 1,150-foot (351 m) through-arch span, with a 600-foot (183 m) central arch suspended by 72 steel cables. No part of the structure touches the water 100 feet (30 m) below, keeping the lake free of support columns. Its four lanes are divided by a central barrier, and a 6-foot-wide (1.8 m) bike and pedestrian lane runs alongside. The steel has a uniform weathered rust finish.

Loop 360 was planned from 1962 as a western circular road; the bridge contract was let in late 1979 and the span was redesigned in 1978 as a tied-arch to keep concrete pillars out of the lakebed. Steel erection ended by July 1982, and the bridge was dedicated on November 29, 1982 by mayor Carole McClellan, opening to traffic on December 3, 1982.

The bridge is named for Percy V. Pennybacker Jr., an Austin resident from 1939 who designed bridges for the Texas Highway Department for over 20 years and pioneered welded structures. A scenic overlook sits due north of the span on the west side of Loop 360, described by KVUE in 2019 as one of Austin's most popular photo spots.

The bridge carries four lanes of Loop 360 with a central barrier wall, plus a 6-foot-wide bike and pedestrian lane. Cyclists use it as part of the Loop 360 route, and the south approach has a turnaround under the bridge with public lake access for boaters. A scenic overlook sits due north on the west side of Loop 360, where visitors park on the shoulder.

The 600 short tons of steel were rolled in Japan, fabricated into bridge structures by Hyundai Heavy Industries in Ulsan, Korea, then shipped on the freighter Jundale to the Port of Houston and trucked to the site. Bristol Steel of Bristol, Virginia, erected them, and the roadway was sandblasted for an even amber patina.