43 CFR § 2094.0-5
Definitions
June 11, 2020
The term navigable waters is defined in section 2 of the Act of May 14, 1898 (30 Stat. 409; 48 U.S.C. 411), to include all tidal waters up to the line of ordinary high tide and all nontidal waters navigable in fact up to the line of ordinary highwater mark.