The California High Speed Rail Authority have recently posted aerial shots of the various construction sites that are well underway in the California Central Valley, primarily around Fresno. They tend to post updates on their official Flickr account once or twice a month, but most are taken at ground level. Since the Google Earth satellite images are unfortunately over 2-year old at this point, these new photos, taken last week, provide a unique vantage point. Seeing the action from above, you can really understand the scale of the various bridges, and make sense of how they fit in.
The Cedar Viaduct is probably the most important construction area right now because of the impact it will have. The bridge will take trains over CA-99, which sees around 95,000 vehicles passing by every day. Many people are still unaware that HSR is actually happening, so seeing the bridge take shape will have a large impact.