Question 14 Deck General

The correct answer is D. To determine the correct answer, we need to consider the information provided about the International Bridge on the St. Marys River. The question states that the gage on the bridge, read from top to bottom, indicates 124 ft. and the IGLD (1955) is at 8 ft. The IGLD (International Great Lakes Datum) is a reference point used to measure water levels in the Great Lakes region. The 1955 datum is the most recent version of this standard. Given this information, the vertical clearance under the bridge is 124 ft. - 8 ft. = 116 ft. Therefore, the correct answer is D. The other options are incorrect because they do not accurately reflect the vertical clearance under the bridge based on the provided information.