Question 50 Deck General

70% to pass

The vertical reference for all water levels and bench marks on the Great Lakes - St. Lawrence River System is known as _______________.

A Great Lakes Low Water Datum

B Mean Sea Level Datum

C International Great Lakes Datum

D North Central Reference Datum

AI Explanation

The correct answer is C) International Great Lakes Datum. The International Great Lakes Datum (IGLD) is the vertical reference used for all water levels and benchmarks on the Great Lakes - St. Lawrence River System. This datum was established by an international agreement between the United States and Canada to provide a consistent and accurate reference for water levels across the entire Great Lakes basin. The other options are not the correct vertical reference for this system.

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