33 CFR 329.5 - General scope of determination.
The several factors which must be examined when making a determination whether a waterbody is a navigable water of the United States are discussed in detail below. Generally, the following conditions must be satisfied:
(a) Past, present, or potential presence of interstate or foreign commerce;
(b) Physical capabilities for use by commerce as in paragraph (a) of this section; and
(c) Defined geographic limits of the waterbody.