A U.S. Army Corps of Engineers district is a geographic unit. It runs civil works (channels, levees, navigation, flood-risk projects) and the regulatory program (Section 404, Section 10, and related permissions) inside a defined boundary. Your permit and your approved jurisdictional determination go to the district that has the aquatic resource — not to a national inbox and not to whichever office is closest to your headquarters.
On the northern Gulf, Cypress’s working set is Mobile, Vicksburg, New Orleans, and Jacksonville Districts. That is where our field and permit work usually lands. It is not a phone directory, and it is not a claim that every project in four states is ours.
Districts are geography, not brands
The Corps divides the country into divisions and districts. Divisions are broad geographies: South Atlantic, Mississippi (River) Valley, Southwest, North Atlantic etc. Districts are based on watershed boundaries and typically cover 1-5 US states.
Districts hold the day-to-day regulatory authority for waters of the United States in their area. They also plan and operate civil works projects in the same general footprint — which is why Section 408 (permission to alter a Corps project) often shows up in the same conversation as 404 on a Gulf levee or channel.
When people say “we filed with the Corps,” they mean a specific district office and a specific project manager. Mobile District does not review a Vicksburg wetland by default. Crossing a district boundary mid-property is workable, but does require extra coordination.
The four districts we work
Mobile District. Much of coastal Alabama and Mississippi, and inland reaches that drain to Mobile Bay, the Pascagoula River, and small independent coastal streams, sit here for regulatory work. Biloxi, Pascagoula, Mobile, and Eastern Shore waterway and wetland permit application files land in Mobile.
Vicksburg District. The Mississippi River, Red River, Pearl River and adjacent systems in its boundary — including parts of Mississippi and Louisiana that are not New Orleans District’s coastal/regulatory slice. Riverine and deltaic work often points here.
New Orleans District. Coastal Louisiana and lower Mississippi River civil works and regulatory geography. When the project site is in New Orleans District, that is where the JD or permit goes for review.
Jacksonville District. Florida’s regulatory and civil-works footprint for Corps purposes in much of the peninsula and associated waters. Pensacola-area and Florida panhandle projects commonly interface with Jacksonville when the water is federal.
Boundaries follow watersheds and assigned civil-works limits more than state lines. A site can be in Mississippi and still need a careful look at which district owns the feature. Do not guess from the mailing address of the developer.
What goes to the district
- Approved or preliminary JDs. The finding of whether a water or wetland is a water of the United States. See What is a jurisdictional determination?.
- Section 404 / Section 10 permits. Nationwide, regional general, or individual — reviewed under that district’s regional conditions and the current WOTUS reading after Sackett.
- Mitigation bank instruments and many IRT processes. The Corps district chairs or co-chairs the Interagency Review Team for banks in its area. See What is an IRT? and mitigation banking.
- Section 408 permissions. When your work would alter or occupy a Corps civil works project. Separate statute from 404. See What is a Section 408 permission?.
State 401 water quality certification and coastal consistency still run through the state. The district does not replace Mississippi, Alabama, Louisiana, or Florida programs.
What a district is not
- Providers of delineation or permitting support. USACE evaluates submittals, but relies on independent consulting firms to produce information for them to evaluate. Field flags and a delineation report still come first. Cypress’s service page for that work is wetland delineation.
- Not one phone number for the whole Corps. Each district has its own regulatory branch, project managers, and public notices.
- Not “the EPA.” EPA has its own Clean Water Act roles; the day-to-day JD and 404 decision on most sites is the district.
- Not organizationally or culturally homogeneous. There are widely varying interpretations of regulations among Corps Districts. Jurisdictional calls, permitting, mitigation requirements and so on. They are closer to behaving like independent states than branch offices.
How we use it
We identify which district has the resource, put the delineation and JD or permit package in that lane, and say when New Orleans, Mobile, Vicksburg, or Jacksonville is the wrong door. Cypress Environment & Infrastructure works from Biloxi, Mobile, and Pensacola, in the Mobile, Vicksburg, New Orleans, and Jacksonville Districts. Office hours are Monday–Friday, 9 a.m.–5 p.m.
See 401 vs 404 and projects. This page does not represent an official Corps position or opinion.