🔍 Key Concepts

• Lower Mississippi River (LMR) river miles and how they are labeled on charts • Difference between Right Descending Bank (RDB) and Left Descending Bank (LDB) • How revetments and trench fills are usually shown and labeled in the USACE LMR river charts or the Coast Pilot

💭 Think About

• First, decide on which bank of the river the Vaucluse Trench Fill revetment is located by checking a reliable chart or publication. • Next, identify the river mile limits of that revetment and compare those exact mile markers with the ranges given in the choices. • Ask yourself: does the revetment cover a longer section or a shorter section, and do the mile markers in the options increase or decrease in the correct downstream direction?

✅ Before You Answer

• Verify in a current Lower Mississippi River chart or USACE river map the exact river miles for the Vaucluse Trench Fill revetment. • Confirm whether the Vaucluse Trench Fill is on the Right Descending Bank (RDB) or Left Descending Bank (LDB) before eliminating any choices. • Double‑check that the mile markers run in the correct downstream order for the LMR when interpreting ranges like 535.9–534.3 or 524.3–522.6.