Your vessel is approaching the International...

Study

Question 1 of 2066636ee728f7522a1c518ec7

Your vessel is approaching the International Bridge on the St. Mary's River. If the gage on the bridge, read from top to bottom, indicates 124 ft. and the IGLD (1955) is 600 ft., determine the actual vertical clearances between the existing water level and the lowest point of the bridge over the channel.

Back

Question 1 of 20

66636ee728f7522a1c518ec7

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

• Bridge vertical clearance gages are referenced to a specific chart datum, not directly to the water surface height • IGLD (1955) is a water level datum used on the Great Lakes and connecting waterways • Think about whether you should add or subtract the gage reading from the IGLD (1955) level to find the clearance above the current water level

💭 Think About

• What does the gage number (124 ft), read from top to bottom, actually represent in relation to a fixed datum and the bridge structure? • How does the IGLD (1955) level of 600 ft correspond to the present water surface height, and how might that relate to the bridge clearance? • If you imagine the bridge and water level on a vertical scale, which values belong to fixed structures and which belong to changing water levels?

✅ Before You Answer

• Be clear whether the gage reading represents remaining clearance or a height above/below a datum • Confirm how IGLD (1955) is typically used: is it giving you the water level elevation, the bridge elevation, or something else in this context? • Check if any answer choices are clearly unrealistic as a vertical clearance between water and bridge for a river crossing bridge.

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed