General definition.
33 C.F.R. § 329.4
in effectEffective: 2024-07-01Navigable waters of the United States are 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.
Source: eCFRURL: https://www.ecfr.gov/api/versioner/v1/full/2024-07-01/title-33.xmlFetched: 7/26/2026
