Question 22 RVR03 - Mate of LT 500-1600 GRT

The Correct Answer is C. ### Explanation of Correct Answer (C) Option C, **The St Lawrence River to Trois-Rivieres**, is correct because the area described is explicitly excluded from the definition of the "Great Lakes" under the Inland Rules of the Road (33 CFR § 89.25). The Inland Rules define the "Great Lakes" as "Lake Superior, Lake Michigan, Lake Huron, Lake Erie, and Lake Ontario, their connecting and tributary waters, and the St. Lawrence River as far east as St. Regis." St. Regis is a point near Cornwall, Ontario, which is far upstream (west) of Trois-Rivieres, Quebec. Therefore, the waters of the St. Lawrence River east of St. Regis are considered "western rivers or other waters designated by the Secretary" (usually requiring compliance with Western Rivers/Inland Rules requirements specific to those areas, but fundamentally outside the designated Great Lakes definition for equipment and rules purposes). ### Explanation of Incorrect Options **A) Portions of the Calumet River:** This is incorrect because the Calumet River is a connecting and tributary water body to Lake Michigan. Since the Inland Rules define the Great Lakes as including "connecting and tributary waters," portions of the Calumet River are included under the Inland Rules definition of the Great Lakes. **B) Saginaw Bay, Michigan:** This is incorrect because Saginaw Bay is a major arm of Lake Huron. Since Lake Huron is explicitly one of the five Great Lakes, the bay is considered part of the Great Lakes system, and is subject to the Inland Rules definition of the Great Lakes. **D) Portions of the Chicago River:** This is incorrect because the Chicago River system is a connecting and tributary water body to Lake Michigan (or historically to the system that connected to Lake Michigan). As with the Calumet River, "connecting and tributary waters" are included in the Inland Rules definition of the Great Lakes.