What are navigable waters? Here are some definitions.
Noun
Used other than with a figurative or idiomatic meaning: see navigable, waters.
(law, US) Those waters that are subject to the ebb and flow of the tide and/or are presently used, or have been used in the past, or may be susceptible for use to transport interstate or foreign commerce. A determination of navigability, once made, applies laterally over the entire surface of the waterbody, and is not extinguished by later actions or events which impede or destroy navigable capacity.
