Just twenty years after the 6th Street Viaduct was constructed the cement supports began to disintegrate. Over the years, various costly restorative methods have been tried, but none have worked to correct the problem.

Constructed in 1932, the 6th Street Viaduct is an important engineering landmark in the City of Los Angeles. It is one of a set of fourteen historic Los Angeles River crossing structures. With an overall length of 3,500 ft. it is the longest of these structures. It is a critical east-west transportation link between LA Arts District and Boyle Heights and has been determined to be eligible for listing in the National Register.

The concrete in the 6th Street Viaduct has been subject to a chemical reaction, known as Alkai Silica Reaction (ASR) causing significant deterioration of the structure.

• City Council's Board of Public Works Committee meeting - November 16, 2011.
• City of Los Angeles, City Council EIR Certification Hearing - November 18, 2011.
• Community Advisory Committee Meeting - October 27, 2011. (32 KB, PDF)
• Cultural Heritage Commission Briefing - November 3, 2011.

• Record of Decision obtained on December 21, 2011
• EIR certified by City Council on November 18, 2011
• Final EIR/EIS document has been released for public review. Cover Letter (473 KB, PDF)
  Volume 1 (17,678 KB, PDF)
  Volume 2 (31,788 KB, PDF)
• EIR was adopted by Board of Public Works on October 19, 2011
• Board of Public Works Briefing was released on January 25, 2010 (1,579KB, PDF)
• Final Seismic Retrofit Strategy Report Now Available (14,343KB, PDF)
• Field Sampling and Testing Program Final Report Now Available (3 Parts)
• Notice of Preparation (NOP) was released on July 27, 2007 (25KB, PDF)
• Initial Study was released on July 27, 2007 (407KB, PDF)