# 33 CFR § 2.34: Waters subject to tidal influence; waters subject to the ebb and flow of the tide; mean high water

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/ecfr-33-2.34

## Section

- **Citation:** 33 CFR § 2.34
- **Heading:** Waters subject to tidal influence; waters subject to the ebb and flow of the tide; mean high water
- **Jurisdiction:** Federal
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** September 22, 2026
- **Source:** Publisher's official text
- **Location:** Title 33—Navigation and Navigable Waters > CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY > SUBCHAPTER A—GENERAL > PART 2—JURISDICTION > Subpart B—Jurisdictional Terms

## Text

(a) Waters subject to tidal influence and waters subject to the ebb and flow of the tide are waters below mean high water. These terms do not include waters above mean high water caused by flood flows, storms, high winds, seismic waves, or other non-lunar phenomena.
(b) Mean high water is the average of the height of the diurnal high water at a particular location measured over a lunar cycle of 19 years.

## Nearby sections

- [33 CFR § 2.1 § 2.1 Purpose.](https://www.frixlaw.com/law-library/statutes/ecfr-33-2.1.md)
- [33 CFR § 2.5 § 2.5 Specific definitions control.](https://www.frixlaw.com/law-library/statutes/ecfr-33-2.5.md)
- [33 CFR § 2.20 § 2.20 Territorial sea baseline.](https://www.frixlaw.com/law-library/statutes/ecfr-33-2.20.md)
- [33 CFR § 2.22 § 2.22 Territorial sea.](https://www.frixlaw.com/law-library/statutes/ecfr-33-2.22.md)
- [33 CFR § 2.24 § 2.24 Internal waters.](https://www.frixlaw.com/law-library/statutes/ecfr-33-2.24.md)
- [33 CFR § 2.26 § 2.26 Inland waters.](https://www.frixlaw.com/law-library/statutes/ecfr-33-2.26.md)
- [33 CFR § 2.28 § 2.28 Contiguous zone.](https://www.frixlaw.com/law-library/statutes/ecfr-33-2.28.md)
- [33 CFR § 2.30 § 2.30 Exclusive Economic Zone.](https://www.frixlaw.com/law-library/statutes/ecfr-33-2.30.md)
- [33 CFR § 2.32 § 2.32 High seas.](https://www.frixlaw.com/law-library/statutes/ecfr-33-2.32.md)
- [33 CFR § 2.34 § 2.34 Waters subject to tidal influence; waters subject to the ebb and flow of the tide; mean high water.](https://www.frixlaw.com/law-library/statutes/ecfr-33-2.34.md)
- [33 CFR § 2.36 § 2.36 Navigable waters of the United States, navigable waters, and territorial waters.](https://www.frixlaw.com/law-library/statutes/ecfr-33-2.36.md)
- [33 CFR § 2.38 § 2.38 Waters subject to the jurisdiction of the United States; waters over which the United States has jurisdiction.](https://www.frixlaw.com/law-library/statutes/ecfr-33-2.38.md)
- [33 CFR § 2.40 § 2.40 Maintenance of decisions.](https://www.frixlaw.com/law-library/statutes/ecfr-33-2.40.md)
- [33 CFR § 2.45 § 2.45 Decisions subject to change or modification and availability of lists and charts.](https://www.frixlaw.com/law-library/statutes/ecfr-33-2.45.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/ecfr-33-2.34. Check the current official text before relying on it. Not legal advice.