The correct answer is A) Broadcast Notice to Mariners. The Broadcast Notice to Mariners is the correct source for information about major breakdowns, repairs, or other emergency operations with regard to weirs and/or wicket dams on the western rivers. The Broadcast Notice to Mariners is issued by the U.S. Coast Guard and provides timely information to mariners about hazards, changes, or other important updates to navigational conditions, which would include any issues with weirs and wicket dams. The other options are incorrect because: B) Light List Vol. V provides information on lights and other aids to navigation, C) Sailing Directions provide general navigational information but not real-time updates, and D) U.S. Coast Pilot provides detailed descriptions of coasts, harbors, and waterways but does not focus on emergency operations or real-time changes.