To my knowledge, I don't know anyone who was injured last night (local coverage). Pretty much everyone I know back in the Cities works in other areas. So, at 6 p.m. they would have been elsewhere. The child bride used to drive across that bridge every day to get to work.
The I-35 (the road that collapsed) is easily the busiest road in the metro area. From Burnsville to Forest Lake it is almost always slow. Where it collapsed, in the heart of everything, traffic would have been at a standstill even if things hadn't been reduced to one lane. That factor only means that fewer people were affected than would have been.
This is a huge shock if not simply because in the Twin Cities people pride themselves on doing things properly. When you drive around, occasionally you will see signs in people's yards that say "Happy to pay for a better Minnesota," indicating the resident's willingness to pay more tax and maintain the quality of living that makes one forget about the miserable weather. Road projects are constant in the Cities -- they take too long and cost too much money and frustrate everyone, but in the back of your head you always console yourself by thinking: "Well, at least all this time and money means it's being done properly."
Something now has gone horribly wrong, and in probably the worst place imaginable. I-35 is a major artery, so the effect of this disaster will be felt for an extremely long time. And whatever political ramifications that arise will likely be felt severely.
For those of you playing along at home, I hope you're alright.