Which is the vertical reference for all...

Question 1 / 2707066636ee728f7522a1c518eb1

Question 1 of 2707066636ee728f7522a1c518eb1

Which is the vertical reference for all water levels and bench marks on the Great Lakes - St. Lawrence River System?

Question 1 of 27070

Which is the vertical reference for all water levels and bench marks on the Great Lakes - St. Lawrence River System?

🔍 Key Concepts

• How vertical datums are used to reference charted depths and water levels • The specific standardized datum adopted for the entire Great Lakes–St. Lawrence system • Difference between a broad term like mean sea level and a specialized regional datum

💭 Think About

• Ask yourself which option sounds like an official, system-wide standard adopted for the Great Lakes and St. Lawrence River, not just a general geographic area or water level description. • Consider which name would most likely be used on NOAA or Canadian Hydrographic Service charts for that region. • Eliminate any choice that sounds more like a generic description of water level rather than a formally defined vertical datum.

✅ Before You Answer

• Check which option explicitly includes Great Lakes and suggests a formal, basin-wide standard. • Distinguish between a vertical datum name and a low-water reference that might be used for depths but not all water levels and benchmarks. • Recall what vertical datum name appears in official publications for Great Lakes water levels and benchmarks.

Question 1 of 27070

Which is the vertical reference for all water levels and bench marks on the Great Lakes - St. Lawrence River System?

International Great Lakes Datum

North Central Reference Datum

Mean Sea Level Datum

Great Lakes Low Water Datum

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Question 1 / 2707066636ee728f7522a1c518eb1

Question 1 of 2707066636ee728f7522a1c518eb1

Which is the vertical reference for all water levels and bench marks on the Great Lakes - St. Lawrence River System?

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Question 1 of 27070

Which is the vertical reference for all water levels and bench marks on the Great Lakes - St. Lawrence River System?