Sixth Street Viaduct
|This article needs additional citations for verification. (December 2009)|
|6th Street Viaduct|
Sixth Street Bridge
|Official name||Sixth Street Bridge from the LA River|

Sixth Street Viaduct
|This article needs additional citations for verification. (December 2009)|
|6th Street Viaduct|
Sixth Street Bridge
|Official name||Sixth Street Bridge from the LA River|
|Other name(s)||6th Street Viaduct|
|Carries||6th Street/Whittier Boulevard|
|Crosses||Metrolink tracks, Los Angeles River, Union Pacific Railroad tracks, Santa Ana Freeway, Golden State Freeway, several local streets|
|Locale||Downtown and Boyle Heights areas of Los Angeles, California|
|Maintained by||City of Los Angeles and California Department of Transportation (Caltrans)|
|ID number||53C-1880 (City of Los Angeles), 53-0595 (Caltrans)|
|Material||Reinforced concrete and steel|
|Total length||3,500 feet (1,100 m)|
|Width||46 feet (14 m)|
The Sixth Street Viaduct is a viaduct bridge that connects the downtown and Boyle Heights areas of Los Angeles, California. It spans the Los Angeles River, the Santa Ana Freeway (US 101), and the Golden State Freeway (I-5), as well as Metrolink and Union Pacific railroad tracks and several local streets. Built in 1932, the viaduct is composed of three independent structures: the reinforced concrete west segment, the central steel arch segment over the river, and the reinforced concrete east segment.
During the construction of the viaduct, an on-site plant was used to supply the concrete for construction. However, the quality of the concrete turned out to have a high alkali content and lead to an alkali-silica reaction which creates cracks in the concrete and saps the strength of the structure.
It is one of the only historic LA River bridges to suffer from ASR.
- [dead link]
- "Sixth Street Viaduct has Cancer; Suggested Treatment: New Bridge". blogdowntown. Retrieved 2013-04-27.