Crazy Study Claims Waterloo More Dangerous than Cedar Rapids I must confess that I had to do a double-take when I first saw this. It's a new study ranking the most dangerous cities in Iowa. I can confirm that they list Waterloo as being more dangerous than Cedar Rapids. I want to be clear that this is not my opinion or my study. Nope. You can blame this one on Roadsnacks. It's their 2021 Most Dangerous Cities in Iowa list. At first glance, you won't even notice Waterloo or Cedar Rapids as there aren't many parts of our area in Iowa that make the top 10. However, if you look at the full list, you'll notice something staggering.