If you are placing material below the ordinary high water mark of a water of the United States, you need authorisation. That is true for a homeowner, a contractor, a utility, and a state DOT alike, and it is true whether the material is stone, concrete, bags, or a mat.
This is an orientation to the approvals that recur, not legal advice. Requirements vary by Corps district, by state, and by waterbody, and the only authoritative answer comes from the agencies with jurisdiction over your site.
The federal layer
Two statutes do most of the work.
Section 404 of the Clean Water Act regulates the discharge of dredged or fill material into waters of the United States, including many wetlands. Armor placed on a bed or bank is fill. The US Army Corps of Engineers administers it. See Section 404 of the Clean Water Act.
Section 10 of the Rivers and Harbors Act of 1899 regulates work and structures in navigable waters of the United States. Where a waterbody is navigable in the legal sense, Section 10 applies in addition to Section 404. See Section 10 of the Rivers and Harbors Act.
Both are administered by the Corps, and on a navigable water a single application generally covers both.
Authorisation under either comes in two broad forms:
- General permits, including nationwide permits — pre-authorised categories of low-impact activity with conditions attached. Bank stabilization has its own, covered in Nationwide Permit 13. Faster, when your project fits.
- Individual permits — a project-specific review, with public notice. Slower, and the route when the work exceeds what a general permit allows.
The state layer
Federal authorisation is rarely the whole picture.
Section 401 water quality certification. A federal permit affecting a water of the US requires certification from the state (or tribe) that the work will comply with state water quality standards. In practice the state can attach its own conditions, and it is a common source of requirements that surprise applicants who were only tracking the Corps.
State in-water or streambed permits. Many states regulate work in beds and banks under their own statutes, with their own applications and their own timelines. These are separate from the federal process and frequently drive the schedule.
Coastal zone approvals where applicable. See state coastal zone approvals.
Floodplain authorisation where the work is in a mapped floodplain or floodway, usually administered locally. See floodplain permitting and no-rise.
The consultations that ride along
These are not permits, but a permit cannot issue until they are resolved.
Endangered Species Act consultation, where a listed species or designated critical habitat may be affected. See Endangered Species Act consultation.
Section 106 cultural resources review, where the work may affect historic properties. Riverbanks and shorelines are archaeologically sensitive more often than people expect.
Essential fish habitat consultation, in coastal and marine settings.
Tribal consultation, where applicable.
Any of these can extend a timeline substantially, and they are the most common reason a “simple” permit takes a year.
Construction-phase approvals
Separate from the authorisation to build the thing, you generally need authorisation for the disturbance of building it: construction stormwater permitting, covered in construction stormwater permitting, plus any dewatering or diversion authorisation if the method requires a dry working area.
That last point is worth flagging early, because it is a system-selection issue as much as a permitting one. A method requiring a coffer dam brings its own approvals and its own schedule; a method placed in flowing water does not.
The constraint that usually decides the date
Not the permit. The in-water work window.
Most jurisdictions restrict in-water construction to a defined season, set by the life cycle of fish or other aquatic species. Outside that window, work in the water is not allowed regardless of what permits you hold.
The practical consequences:
- Missing a window can mean waiting a year
- The window may be short, so the work has to be achievable inside it
- Placement rate becomes a selection criterion, not a nice-to-have
- Emergency work may be handled differently, but that is a specific determination and not an assumption
In-water work windows covers this.
A workable sequence
- Establish jurisdiction early. Which waters, which agencies, which district. A pre-application meeting with the Corps district is usually free and frequently saves months.
- Find the work window before you plan anything else.
- Determine whether a general permit fits. If it does, the path is much shorter.
- Start the consultations early. They are usually the long pole.
- Line up the state approvals in parallel, not after the federal.
- Design with the permitting in mind. Methods that avoid dewatering, minimise footprint, and avoid new hard structure in the channel tend to permit more easily.
- Assemble the package properly. See assembling the submittal package.
When the repair cannot wait
Emergency provisions exist. They are real, they are used, and they are not a way around the process — they are a different, faster path with its own requirements and usually a follow-up obligation. Knowing which applies to you and who to call is something to establish before an event, not during one. Emergency permitting covers it.
Where to go next
- Section 404 and Section 10
- Nationwide Permit 13 for the bank stabilization general permit
- What an agency reviewer wants to see
- Getting a non-standard product approved for DOT and agency work
- The permitting hub for the rest
We are a supplier, not the engineer of record and not your permitting consultant. What we can do is provide the product documentation a submittal needs. Send the scope through the quote form.