Brown trout can be quite large, especially those that live in large rivers or lakes. The brown trout in Southeastern Minnesota are generally smaller, sometime getting to 20-24" in length. Most are smaller.
Clean, cool streams and rivers, although they are more tolerant of warmer and dirtier water than most trout. This trout is generally considered a native of Europe and Asia, but has been widely introduced across the United States.
This particular trout was caught by my wife while she was flyfishing.