🔍 Key Concepts

• Great Lakes load line seasons (winter, intermediate, summer, midsummer) and how they are defined by dates • The difference between summer load line and midsummer load line on the Great Lakes • How regulatory date ranges are usually set in the CFR for seasonal zones

💭 Think About

• Look at the answer choices and ask: which one looks like a shorter, peak-summer window within the overall Great Lakes navigation season? • Compare the dates you remember for the summer load line season; when would a special midsummer mark logically apply inside that broader season? • Think about which dates are too long or too early/late in the year to reasonably be called "midsummer" on the Great Lakes.

✅ Before You Answer

• Verify in 46 CFR Part 45 (Great Lakes Load Lines) the defined date ranges for summer and midsummer seasons. • Check that the selected date range is entirely within the general Great Lakes navigation/summer season, not overlapping obvious spring/fall transition periods. • Confirm that the chosen dates represent a relatively short central-summer period, not the whole warm season.