The U.S. Army Corps of Engineers is organized in three tiers: a headquarters in Washington, D.C., nine regional divisions whose boundaries follow watersheds rather than state lines, and forty-four districts that carry out the actual engineering, construction, and permitting work.1EveryCRSReport.com. U.S. Army Corps of Engineers Civil Works – FAQs on Organization and Efficiency Reviews It is both a federal agency and a major command within the Department of the Army, with roughly 36,000 civilian employees and 800 military personnel handling a portfolio of about $68 billion across more than 110 countries.2U.S. Army Corps of Engineers. Lieutenant General William H. “Butch” Graham, Jr. Civilian engineers, scientists, and project managers do most of the technical work; military officers provide command at every level.
Headquarters and the Chief of Engineers
At the top sits the Chief of Engineers, a three-star Lieutenant General who also serves as Commanding General of the Corps and as the principal engineering advisor to the Secretary of the Army. The current officer in the role is Lieutenant General William H. Graham Jr., the 56th to hold the position.3U.S. Army Corps of Engineers. Leadership The position’s legal authorities come from Title 10 of the U.S. Code, which defines Army commands.
Headquarters translates broad congressional mandates and appropriations into plans the regional offices can execute. It handles budgets, strategic planning, and coordination with Congress and the Office of Management and Budget. Internal organization follows Engineer Regulation 10-1-1, a directive that lays out how programs and administrative functions are structured. Specialized staff offices at headquarters cover legal affairs, financial management, and procurement oversight so that projects across the country meet federal contracting and environmental standards.
The Nine Regional Divisions
Below headquarters, the Corps splits the country and its overseas work into nine divisions: Great Lakes and Ohio River, Mississippi Valley, North Atlantic, Northwestern, Pacific Ocean, South Atlantic, South Pacific, Southwestern, and Transatlantic.4U.S. Army Corps of Engineers. Locations Eight of these divisions cover domestic territory; the Transatlantic Division handles work outside the United States.
The domestic boundaries follow watersheds and natural landscape features rather than state lines. That is a deliberate design choice. The primary civil works job is managing how water moves through the environment, so a river basin is a more useful management unit than a political border. A single flood-control system, navigation channel, or reservoir project often crosses several states but belongs to one hydrologic region.
A division does not typically execute projects itself. It supervises the districts under it, reviews their decisions, and serves as the appeal authority when a permit applicant challenges a district-level determination. The division engineer, generally a Brigadier General, is the operational link between headquarters policy and district-level work.
The Forty-Four Districts
Districts are where the engineering actually happens.1EveryCRSReport.com. U.S. Army Corps of Engineers Civil Works – FAQs on Organization and Efficiency Reviews Each district manages projects within its geographic area: dredging commercial ports, building and maintaining levees, operating locks and dams, issuing regulatory permits, and running feasibility studies for new construction. The district office is what most contractors, local governments, and permit applicants deal with directly.
A district is usually commanded by a Colonel, though some are led by a Lieutenant Colonel.5Defense Technical Information Center. USACE District Commanders The commander is not expected to be a trained engineer. Technical work is done by a large civilian workforce of licensed professionals, and the military commander provides leadership, accountability, and continuity with the Army chain of command. Command tours are typically short, so the civilian staff carries most of the institutional knowledge on any given project.
Funding at the district level is mostly project-specific. Congress appropriates money for particular construction or maintenance tasks rather than handing districts a lump sum to spend as they see fit. Local governments and other partners often share costs through legally binding agreements that spell out each party’s financial obligations. The district office also runs the competitive bidding process for construction contracts and enforces federal quality and safety standards on every job. A project manager inside the district shepherds a task from initial feasibility study through final construction, coordinating with environmental scientists, regulators, and the public along the way.
How the Structure Splits Civil Works and Military Programs
The same district-and-division map serves two very different missions. The Civil Works Directorate handles public water infrastructure: navigation, flood risk reduction, ecosystem restoration, thousands of miles of inland waterways, and 75 hydropower plants with a combined installed capacity of nearly 22,000 megawatts.6U.S. Army Corps of Engineers – Institute for Water Resources. Hydropower It also administers the Section 404 permit program for discharges into wetlands and other waters of the United States, working alongside the EPA.7U.S. Environmental Protection Agency. Permit Program Under CWA Section 404
The Military Programs Directorate uses the same regional structure to provide design and construction for the armed forces and other federal agencies: barracks, training facilities, and medical centers, plus environmental cleanup at current and former military sites. Roughly 5,400 formerly used defense sites have been identified for investigation and cleanup, and about 1,600 still require active remediation.8U.S. Army Corps of Engineers. Formerly Used Defense Sites Program These projects are authorized through annual defense appropriations rather than civil works appropriations, but they are executed by the same district offices that manage locks and levees.
The practical effect is that a single district can be running a civilian flood-control levee, an EPA Superfund cleanup contract, and a military installation construction project at the same time, with different funding streams and different legal authorities behind each one.
Specialized Commands Outside the District Map
Not every part of the Corps fits inside the division-district geography. The Engineer Research and Development Center, headquartered in Vicksburg, Mississippi, is the agency’s research arm and reports up independently of the regional structure. ERDC runs seven laboratories covering coastal and hydraulic engineering, cold regions research, construction engineering, environmental science, geospatial research, geotechnical and structural engineering, and information technology.9U.S. Army Engineer Research and Development Center. Engineer Research and Development Center Its output, from flood modeling software to construction materials for extreme environments, feeds back into how the districts design and build in the field.
Similar specialized centers exist for areas like water resources analysis and marine transportation, sitting alongside the geographic chain of command rather than inside it. The division-and-district map is the backbone of the organization, but the full command diagram is a backbone with several specialized branches attached at the top.