Anniebach...So sorry about the tragic death of your daughter. It's not long ago.
It's different, but when I was 16 (1975), I was with my 21-year-old brother (we were close, worked together, shared the same friends, etc) on an evening out, we got very drunk, his girlfriend dumped him that evening, and we decided to flag down a taxi. To cut a long story short, my brother was so drunk, he fell into the road, and a speeding car ran over him, dragged him up the road for 50 yards or so. I witnessed it all. Needless to say, he died. It was the day after our dad's birthday, and 3 weeks before Christmas. For many years, I had to travel on the bus, right past the spot where it had happened. There was no other route I could have taken, to get to work/shops/town, etc. It was awful, but I had to do it (I had to go back to work a week after the accident - my mum had just been made redundant, so my dad and I were the only ones earning).
It must be terrible, to see that bridge -but surely, the longer you put it off, the harder it will be to overcome going across, don't you think? Is there anyone who could go with you?