You are transiting the Straits of Mackinac...

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Question 1 of 2066636ee728f7522a1c518cee

You are transiting the Straits of Mackinac by way of an improved channel. You have information which indicates that the channel's Federal project depth is 28 ft. Which of the following statements is true with regards to this channel?

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Question 1 of 20

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🔍 Key Concepts

• Meaning of Federal project depth on U.S. Army Corps/NOAA charts • Difference between design depth, controlling/least depth, and project depth • How dredged channels are marked on charts (centerline vs edges)

💭 Think About

• Ask yourself: does 'Federal project depth' describe the actual, surveyed least depth or the depth the channel was originally intended to be dredged to? • Consider whether depths can change over time due to shoaling. Would the government guarantee that no spot in the channel is shallower than that project depth? • Think about how safe navigation margins are handled—would mariners rely only on project depth, or on up‑to‑date survey soundings and Notices to Mariners?

✅ Before You Answer

• Verify what project depth means in U.S. Army Corps dredging terminology, not just common-language interpretation of 'depth'. • Check whether project depth refers to the entire width of the channel or just to the designed navigable portion (often the center or maintained area). • Confirm whether any of the options incorrectly treat project depth as a guaranteed minimum depth actually available right now.

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