The patchwork of US anchoring law is confusing because it operates on multiple levels simultaneously. Federal law — primarily the Rivers and Harbors Act and the federal navigational servitude — establishes a broad right to anchor in navigable waters of the United States. No single federal statute prohibits anchoring as a general matter. But that federal right exists alongside — and is frequently narrowed by — state law, county ordinances, municipal regulations, and federal marine sanctuary rules. The result is that "can I anchor here?" is a question that may have a different answer in different waters of the same harbor.
The Federal Navigational Servitude
The federal navigational servitude is the legal doctrine by which the US government retains paramount authority over navigable waterways for the purpose of commerce and navigation. Under this doctrine, the right to navigate — which includes the right to anchor temporarily in the course of navigation — is a federal interest that states cannot extinguish entirely. Courts have repeatedly held that states cannot prohibit anchoring in navigable waters as a blanket matter, because that would interfere with the federal interest in navigation.
What states and localities can do is regulate anchoring in specific ways for specific purposes — to protect environmental resources, to manage traffic in congested harbors, to address public safety, or to address the problem of derelict vessels that have been de facto abandoned at anchor. The distinction between regulation and prohibition is where the legal battles get fought. In Florida, some of these battles have been quite public.
Federal regulation does prohibit certain types of anchoring regardless of state law. Under Coast Guard regulations, anchoring in a fairway — the designated navigable portion of a waterway — is generally prohibited without a permit. Anchoring in a designated anchorage area is always permitted. Anchoring outside both (in water that is navigable but not a charted fairway and not a designated anchorage) is where state and local rules apply.
The 72-Hour Rule and Time Limits
Many states and localities limit the duration of anchoring in specified areas. The most common limit is 72 hours — after which a vessel must move a minimum distance (often a mile or more) or leave the area before returning. Florida has implemented 72-hour limits in several counties, particularly in areas with concentrations of live-aboard vessels and derelict boats.
Time limits on anchoring are generally upheld by courts as a valid form of regulation that does not amount to prohibition. A mariner who anchors for a few nights while cruising is well within any 72-hour limit. A vessel that has been anchored in the same spot for three months is a different matter — and the regulations are primarily aimed at that situation, even if they technically apply to everyone.
The relevant time limit for a given anchorage is typically posted in the cruising guide, in Active Captain comments, and sometimes on physical signs at the harbor entrance or on a floating regulatory marker (a white buoy with orange markings). When in doubt, call the local harbormaster or marine patrol and ask.
Florida: The Most Regulated Anchoring State
Florida has the most complex and litigated anchoring rules in the United States, driven by the large year-round population of live-aboard sailors and the political dynamics of waterfront property owners in communities like Key West, Fort Lauderdale, and the Tampa Bay area.
Florida statute 327.60 governs local regulation of anchoring and generally preempts local ordinances — counties and cities cannot adopt anchoring rules that are more restrictive than state law except in certain circumstances and designated areas. However, the statute also authorizes the creation of mooring fields — designated areas where vessels must use provided moorings and anchoring is prohibited. In Florida mooring fields, anchoring is explicitly not permitted. Vessels must take a mooring ball and pay the applicable fee.
Key West has been the epicenter of Florida's anchoring controversy for decades. The conflict is between the live-aboard and cruising community (which views free anchoring as a right and a tradition) and property owners and local officials who view concentrations of anchored vessels as an environmental and aesthetic problem. The result has been a series of designated anchorage zones, mooring field requirements, and time limits in Monroe County. The rules have changed multiple times and will likely continue to change — check the current Florida Fish and Wildlife Conservation Commission guidance before anchoring in the Keys.
Outside of designated mooring fields, Florida generally permits anchoring in navigable waters within the restrictions set by statute. The main operational rules: anchoring within a mooring field is prohibited, anchoring in marked channels is prohibited, and in areas with 72-hour limits, you must comply with the time restriction.
California: Port Authority Regulation and Permit Areas
California anchoring rules are administered primarily at the harbor and port authority level rather than statewide. Major ports like San Diego, Los Angeles/Long Beach, and San Francisco Bay fall under Port Authority jurisdiction, which includes designating anchorage areas and requiring permits for extended anchoring.
In San Diego Bay, anchoring is permitted in designated anchorage areas and prohibited in navigation channels and restricted zones. The San Diego Unified Port District enforces a 72-hour limit in some areas and requires annual permits for vessels that wish to anchor regularly in certain zones. The anchorage at La Playa Cove and the area near Shelter Island have specific rules — check current Port District regulations before anchoring for more than a day or two.
In San Francisco Bay, the Army Corps of Engineers administers certain anchorage areas and has specific rules for each. The Bay has well-designated anchorages — in Richardson Bay (regulated by the Richardson Bay Regional Agency), off Sausalito, and in various portions of the bay — and anchoring outside designated areas is subject to challenge. Richardson Bay has been another flashpoint for live-aboard vessel regulation, with the regional agency having a specific permit system for long-term anchoring.
Channel and Fairway Restrictions: Universal
Regardless of state or local rules, federal regulation prohibits anchoring in a manner that obstructs navigation in any navigable waterway. Practically, this means: do not anchor in a channel, do not anchor where you would block traffic, and do not anchor where your swing circle (the radius your boat sweeps through as wind and current shift) would put you in a channel or navigation lane.
The 5-and-10 rule referenced in many state boating regulations — do not anchor within 5 feet of a channel edge, do not anchor within a certain distance of a swimming beach — is a local implementation of the general federal principle, specific numbers varying by jurisdiction. Some states specify 150 feet from a swimming beach; others set different numbers. In practice, anchoring well clear of channels and beaches avoids most regulatory complications.
Marine Protected Areas: Anchor in Sand Only
The United States designates National Marine Sanctuaries (NMS), National Estuarine Research Reserves, and other marine protected areas with specific anchoring restrictions to prevent anchor and chain damage to sensitive habitat. The rules vary by sanctuary and by zone within a sanctuary, but the general principle is consistent: in areas with coral reef, seagrass, or other sensitive bottom, anchoring is prohibited or restricted to designated sand areas.
The Florida Keys National Marine Sanctuary prohibits anchoring on or near living coral. Anchoring in sand is permitted, but chain dragging across reef is a federal violation with significant fines. The sanctuary boundary is large and the coral is not always visible from the surface — particularly in turbid water. Use the sanctuary's online resources and Active Captain to identify no-anchor zones before dropping the hook in the Keys.
The Channel Islands National Marine Sanctuary off southern California and Gray's Reef NMS off Georgia both have anchoring restrictions in sensitive habitat areas. Consult the sanctuary management plan and the NOAA Office of National Marine Sanctuaries for current zone restrictions before anchoring in any NMS.
In practice, the sand-only rule can be followed by visual assessment of bottom type through clear water, by using an anchor selection that is appropriate for sand (a Danforth or plow works well in sand; a CQR dragging through coral is an environmental problem), and by reading the chart for bottom type notations — "S" for sand, "Co" for coral, "Rk" for rock.
International Anchoring: Different Rules by Country
Every country regulates anchoring in its territorial waters differently, and international cruising requires research in advance. A few representative examples:
Turkey — Turkish territorial waters require foreign vessels to hold a transit log (transit geçiş belgesi), issued by the Turkish authorities at entry. Anchoring in restricted areas (military zones, some protected bays) without authorization is a serious violation. Most popular cruising anchorages are well-established and legal; anchor in a designated or obviously popular spot rather than pioneering new territory near military or restricted zones.
France — Many French marinas and anchorages along the Mediterranean coast are mooring-only in high season, with free anchoring in designated zones only. The French bureaucracy around nautical permits and mooring allocation can be complex. The popular Calanques near Marseille have strict anchoring and mooring regulations to protect the marine park habitat — permits and reservations are required for anchoring overnight in most of the calanques in peak season.
Caribbean islands — Anchoring rules vary dramatically by island. Some islands charge per-night anchoring fees collected by official or semi-official agents (this is common in parts of the Grenadines and Tobago Cays). Some islands have designated National Park zones where anchoring is prohibited and mooring balls are provided. Others have essentially no regulation. The cruising guide for each island group (the Doyle guides for the Eastern Caribbean are the standard reference) will detail the current rules and any fees.
Before entering any foreign anchorage, clear customs and immigration at the designated port of entry, follow that country's check-in procedures, and consult the current cruising guide for anchoring-specific rules. The rules change — check the most recent edition of any guide and supplement with cruiser forum reports.