It appears you might be right. A 1930s photo shows a straight south approach, while the current photo shows something different. According to Wikipedia, this was about 1976, which is weird as it is about 10 years after the ill fated I-35W bridge opened.
i believe the orignal Cedar Ave bridge was a straight approach bridge from the south coming from Cedar Ave, Now the south approach is from 19th Avenue. i think they change the south approach in 1972 and completed in 1976. Or was the south approach changed around the time of the new 35w bridge in 1964?
This bridge was the recent venue for Occupy Wall Street protests. See link below: http://www.startribune.com/local/134074803.html