🔍 Key Concepts

• Mississippi River mile markings (AHP – Above Head of Passes) and how to use them with official river charts • Reading U.S. Army Corps of Engineers river charts for features like revetments, turning basins, and dredge spoil areas • Differences between channel width information and bank structure/features descriptions

💭 Think About

• Which of the choices refers to a permanent, charted riverbank protection or modification that would typically be clearly labeled on an official river chart at a specific mile mark? • How would you confirm what exists at mile 569.0 AHP: by guessing from general river knowledge, or by checking a specific chart symbol/notation for that location? • Are any of the options describing something (like exact river width) that is usually shown differently on charts than a verbal ‘is ___ wide’ statement in a question?

✅ Before You Answer

• Check an official Mississippi River navigation chart for mile 569.0 AHP and read every label on both banks. • Verify what symbols are used on the chart for revetments, turning basins, and dredge spoil and match them to that exact location. • Confirm whether the river width at that mile is actually stated anywhere, or if it must be measured/estimated rather than chosen from a descriptive sentence.