Pennybacker Bridge
Pennybacker Bridge | |
---|---|
Coordinates | 30°21′00″N 97°47′49″W / 30.3500°N 97.7970°W |
Carries | 4 lanes of Loop 360, pedestrians, and bicycles |
Crosses | Lake Austin, Colorado River |
Locale | Austin, Texas |
Other name(s) | 360 Bridge |
Maintained by | Texas Department of Transportation |
Characteristics | |
Design | Through arch |
Total length | 1,150 feet (351 m) |
Longest span | 600 feet (183 m) |
Clearance below | 100 feet (30 m) |
History | |
Opened | December 3, 1982 |
Statistics | |
Daily traffic | 48,000 |
Toll | Free both ways |
Location | |
The Percy V. Pennybacker Jr. Bridge in Austin, Texas, is a through-arch bridge across Lake Austin which connects the northern and southern sections of the Loop 360 highway, also known as the "Capital of Texas Highway." The road is widely considered one of the most scenic urban drives in Texas, in large part due to this arched weathering-steel bridge and the rolling hills that flank the road. In 2001, 48,000 vehicles crossed the bridge daily. Ten years prior to this, 22,000 vehicles had crossed the bridge daily.
History
More commonly known as the "360 Bridge," the contract for the bridge was let in late 1979 and major structural steelwork was finished by July 1982. The bridge was dedicated officially November 29, 1982 by Austin mayor Carole McClellan and other public officials and opened for traffic December 3, 1982.
The bridge is named for
Construction details
The steel bridge has a uniform weathered rust finish allowing the bridge to blend in with the surrounding hills and lake. The 600 short tons (544,311 kg) of steel for the bridge were produced in
Additionally, a local metal fabricator, Beck Tool & Manufacturing (Thomas L. Beck, Owner) was contracted to machine many of the critical components that anchor the cables suspending the roadway.
The bridge is constructed such that no part of the structure touches the water 100 feet (30 m) below. The bridge is 1,150 feet (351 m) long with a 600-foot (183 m) central arched span. This design keeps Lake Austin free from support columns because the recreational lake (really a dammed stretch of the Colorado River) is popular with boaters and waterskiers. The untied arch suspension span is suspended by 72 steel cables. At the time of its construction, it was only the second bridge of its design in the world.
The bridge has four lanes, two in each direction, separated by a middle barrier wall. The bridge also has a 6-foot-wide (1.8 m) bike and pedestrian lane. The bike access on the bridge is one reason for Loop 360's popularity with cyclists. The south approach provides a turnaround under the bridge along with lake access for public boating.
The bridge won first place in the 1984 Federal Highway Administration's Excellence in Highway Design competition. In 1992, the Austin members of the Consulting Engineers Council of Texas were surveyed and selected the bridge as the most innovative example of Austin architecture.
A virtual version of the bridge can be found in the Watopia world of online cycling and running platform Zwift.