CFR /  Title 46  /  Part 45  /  Sec. 45.37 Salt water load lines.

Each vessel that operates in the salt water of the St. Lawrence River must--

(a) Be marked with the summer (S), midsummer (MS), intermediate (I) and winter (W) load line marks under Sec. 45.77 for salt water; and

(b) Be marked with the letters ``FW'' above the fresh water marks and the letters ``SW'' above the salt water marks as described in figure 2.