Western Rivers means -
(1) The Mississippi River;
(2) The Mississippi River's tributaries, South Pass, and Southwest Pass, to the navigational demarcation lines dividing the high seas from harbors, rivers, and other inland waters of the United States;
(3) The Port Allen-Morgan City Alternate Route;
(4) That part of the Atchafalaya River above its junction with the Port Allen-Morgan City Alternate Route including the Old River and the Red River; and
(5) Those waters specified in 33 CFR 89.25.
46 CFR § 10.107
With respect to part 16 of this subchapter only, if the definitions in paragraph (b) of this section differ from those set forth in 16.105, the definition set forth in 16.105 applies.