Question 229Navigation General

The correct answer is C) Light List of the Mississippi River System. The Light List of the Mississippi River System is the most appropriate source to find the vertical clearance of a bridge on the Ohio River, as it provides detailed information on navigational aids, including vertical clearances, for the Mississippi River system, which includes the Ohio River. The other options are not the best sources for this information. Notice to Mariners (A) typically contains temporary or urgent information for mariners, but does not comprehensively list permanent bridge clearances. The Great Lakes Pilot (B) and Coast Pilot of the Gulf of Mexico (D) are specific to other waterways and would not contain the necessary information for the Ohio River.