You have found the dock you want, measured the shoreline, and you are ready to order. Then a neighbor mentions that the last person who put in a dock on this cove got a letter from the county, and someone else says you need the Army Corps of Engineers. This page explains, who regulates docks in the United States and how to find out what applies to your spot before you buy. It is not legal advice: the agencies named here have the final word, and your answer depends on your exact water.
In short: a floating dock permit can come from up to three levels. In navigable waters of the United States, the U.S. Army Corps of Engineers requires a Department of the Army permit under Section 10 of the Rivers and Harbors Act for structures, and its regulation names boat docks, piers and permanent mooring structures; many small docks are covered by general permits. Section 404 of the Clean Water Act adds a permit when fill is placed. Your state, and often your county, town, lake authority or utility, adds its own rules, and an HOA or lake association may too. Call your Corps district and your state agency before you install.
Level 1: the Corps of Engineers (Section 10 and Section 404)
Section 10. Under 33 CFR 322.3, Department of the Army permits are required under Section 10 for structures or work in or affecting navigable waters of the United States. The definition of “structure” in 33 CFR 322.2 includes, among others, any pier, boat dock, boat ramp, permanent mooring structure, permanently moored floating vessel and piling. Navigable waters, under 33 CFR 329.4, are waters subject to the ebb and flow of the tide and/or presently used, used in the past, or susceptible to use to transport interstate or foreign commerce. Whether your lake, river or pond meets that test is a determination the Corps district makes.
General permits. The same section says some activities are already authorized by nationwide general permits (33 CFR Part 330) or by regional general permits issued by districts. If your dock fits one, you may only need to follow its conditions or send a notification; if not, an individual permit is needed. For small boats, 33 CFR 322.5(d) says that, absent overriding public interest, the Corps will generally give favorable consideration to riparian owners’ applications for piers, boat docks, moorings and platforms, with attention to keeping navigation and neighbors’ access clear.
Section 404. Section 404 of the Clean Water Act covers the discharge of dredged or fill material into waters of the United States (33 CFR 323.3). Pilings for piers generally do not count as fill, the regulation says, but all pilings in navigable waters still need Section 10 authorization.
Corps lakes. On lakes managed by the Corps where the surrounding land is under complete federal ownership, floating structures are handled through the lake’s Shoreline Management Plan and Shoreline Use Permits under 36 CFR 327.19, issued at the district’s discretion.
Applying. Under 33 CFR 325.1, individual permit applications use form ENG 4345, available from the district office for your waters.
Level 2: your state
The Corps’ own rules say that zoning and land use are primarily for state, local and tribal governments (33 CFR 320.4(j)), and that a Corps permit is processed alongside any state and local approvals, not instead of them. States differ a lot. Two examples, from their own documents:
| State | What its document says |
|---|---|
| Illinois (DNR Office of Water Resources, Statewide Permit No. 5) | Authorizes minor non-commercial recreational boat docks on waters under the Department’s jurisdiction (with listed exceptions) without an individual permit if they meet conditions: no more than 50 ft into the waterway and never more than 1/4 of its width, no wider than 10 ft, at least 10 ft from the projected property line, dock posts marked with reflective devices, securely anchored against high water and wind. It does not authorize shore protection or fill. |
| Minnesota (DNR 2026 Boating Guide) | Docks extending from shore may not interfere with navigation and generally need no permit unless they exceed width or mooring-space limits; local ordinances may apply. Swimming rafts, lifts and buoys that do not extend from shore cannot be in the water between sunset and sunrise without a county sheriff’s permit, must show the permit number, and need a light or reflectors. Work in the bed of public waters needs a DNR permit. Structures on joint federal-state waters may need a Corps permit. |
To find your state’s agency, use the NASBLA directory of state boating contacts (the Coast Guard’s Boater’s Guide links to it), and ask the state natural resources or water resources agency about structures and buoys.
Level 3: county, town, lake authority, utility and HOA
Local rules are where many dock owners get caught. Counties and towns may have shoreline zoning, setbacks and building permits; Minnesota’s guide, for one, notes there may be local ordinances on docks. Some reservoirs run by power utilities have their own shoreline permit programs. Lake associations and homeowners’ associations can have covenants on dock size, color, lighting and season. Questions worth asking before you buy:
- Is my water “navigable” for the Corps, and is there a general permit for small docks here?
- Does the state limit dock length, width or distance from property lines?
- Do structures away from shore (swim rafts, inflatable docks) need a permit, lights or reflectors?
- Does the HOA or lake association need to approve size, color or placement?
- If I add power, which electrical code edition and inspection apply? (See electric shock drowning.)
What about inflatable and seasonal docks?
The rules we read do not exempt seasonal docks in general. The Corps’ structure list includes “permanent mooring structure” and “permanently moored floating vessel”, while a seasonal, anchored inflatable dock is a question for your district; Minnesota’s guide treats swimming rafts and other structures that do not extend from shore as needing a sheriff’s permit for night placement. Ask with the details in hand: size, how and where it is anchored, how long it stays in, and whether it is attached to shore. Our anchoring guide lists makers’ anchor weights.
Before-you-install checklist
- Find your Corps district regulatory office and ask whether your water is navigable and which general permits apply.
- Call your state natural resources or water agency (NASBLA’s directory lists state boating contacts).
- Check county or town shoreline zoning and any building permit for fixed parts or electrical work.
- Read your HOA or lake association covenants; on a utility or Corps lake, call the shoreline office.
Back to the dock and boating safety hub, or read Coast Guard boat requirements for the boat side of the rules. Businesses planning marina, rental or commercial docks can request more information from makers.
Floating dock permit FAQ
Do I need a permit for a floating dock?
It depends on the water and the state. In navigable waters, the Corps lists boat docks among structures needing Section 10 authorization, often through a general permit. States and towns add their own rules. Ask your Corps district and state agency.
Does the Coast Guard issue dock permits?
Not for private docks. Dock structures in navigable waters go through the Corps; the Coast Guard’s role is boats, navigation aids and marine events on certain waters.
How much does a Corps permit cost?
33 CFR 325.1 lists $10 for non-commercial applications for personal benefit and $100 for commercial ones. Work covered by a general permit may not need an individual application at all, only a notification. State and local fees are separate.
Can my HOA stop me from putting in a dock?
That depends on your covenants and state law, which is a legal question. Read the HOA documents and, if in doubt, ask a local attorney.