Might have something to do with this:
"During the construction of the viaduct (Los Angeles River), an on-site plant was used to supply the concrete for construction (of the bridge). 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.
Current estimates are that the viaduct has a 70% probability of collapse due to a major earthquake within 50 years. [2]
It is one of the only historic LA River bridges to suffer from ASR."
How sad!
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgiYDSsWdX5URcT5uLUiOSSS9qU-ULaW5Nxgx4qu1I_2rx1YLd_liXFRDMRatvDqW2SLyw89HxVNemA9IP_v36gmMPsC89OvcfpU-t7OwFKmqasQ8D0z2gyehNHlyBaX4gQ2wN6NSJdafs/s320/CRW_9887CW.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiUfCkBVtvnVxuT0EQW-NRbqqx7PmdjN-qYSqJuOl3H3hlTyPFWO540cZAfPQm4gHldfuhOnsIZTeNOFGL1VdksKHdnIGeX8jfMrrrw0pIp2MVd_M9Lld3-R6k-3VVDX2KPQqrCa4sgPB4/s320/6thStreetPanoCW.jpg)
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