Research Links I am constantly searching the internet for information to make me a better cat fisherman. These are links I compiled over time. What Are Ledges? Fishing River Ledges. In-fishermen:Impounded River Blue Catfish- Fishing Ledges How To Catch Blue Catfish in the Winter: On The Ledge Missouri River navigation charts: Sioux City, Iowa to Rulo, Nebraska Ledges 101: Understanding the Science Behind Bass and Ledges