🔍 Key Concepts

• Mississippi River System mileage is measured by river miles along the channel, not straight-line distance • Look at the mileage tables or river charts that list mile markers (RM) for major cities and ports • Understand that distances on rivers are often given as the difference between river mile markers of two locations

💭 Think About

• What river mile is Greenville, MS, listed at on standard Mississippi River mileage tables or charts? • What river mile is St. Louis, MO, listed at on the same system? • Once you know both river miles, what do you do with those two numbers to get the distance between the ports?

✅ Before You Answer

• Confirm you are using Mississippi River miles, not statute miles on a map or chartplotter estimate • Make sure both mile markers are taken from the same river (Upper vs Lower Mississippi) and the same reference system • Double-check the subtraction of the two river mile values to ensure the result is reasonable compared to the answer choices