The Edinburg Screwworm Plant Poured Its Last Floor Slab and Is Three-Quarters Through Steel

Two slabs, poured two days apart, are the most specific public measure yet of how far the federal screwworm plant in Edinburg has actually got.

The Army Corps of Engineers' Fort Worth District reported this week that the final slab-on-grade for the Initial Operating Capability building at Moore Air Base in Edinburg was finished on Oct. 8, followed by the Central Utilities Plant slab on Oct. 10. Photographs of the work were posted to the Defense Department's imagery service on Oct. 20, credited to USACE photographer Thomas Byrd. Steel erection is roughly 75 percent complete, with about 750 tons in place and another 500 tons going into the utilities plant, the dispersal facility and the EDS building.

The project, built by Mortenson for USDA, is now described in Corps language as a $610 million facility. It broke ground in April. According to the update, it remains "on schedule to support the accelerated timeline to reach initial operating capability in April 2027."

That phrase is doing a lot of work. Initial operating capability is not full production. What the Corps says the slabs establish is the foundation for vertical construction and for installing the systems that will eventually run the fly line — the irradiation, rearing, holding and release logistics that turn pupae into a weekly aerial release over Texas and northern Mexico. The current target at that milestone is 100 million sterile flies per week, ramping afterward to 300 million.

Because female screwworm flies mate only once, a flood of irradiated males leaves the wild population laying eggs that never hatch. It is the same technique that cleared the United States in 1966 and Central America north of Panama by 2006, and it is the reason the plant's schedule is treated as a national security date rather than a construction milestone. Right now the sterile flies come from a converted fruit-fly facility in Metapa, Chiapas, and from the binational commission's plant in Panama. Metapa drew protests over its odor this month from residents who want it moved, which is an argument for having a second source on U.S. soil that has nothing to do with entomology.

The outbreak the plant is meant to answer has produced more than 50 confirmed U.S. cases since June, the great majority in Texas, and it has already changed the rules on livestock movement: Canada requires 21-day-old paperwork, Colorado adopted an emergency rule this month, and USDA has been reopening southern cattle ports one at a time, with Columbus, New Mexico set to resume Oct. 26. None of that is waiting for Edinburg.

For a build on an "aggressive timeline," the public record is thin. USACE's own newsroom returns an access error to outside requests, and the update itself came through a construction-industry trade outlet rather than a USDA release. What the Corps has confirmed is the sequence: slabs done, steel three-quarters up, vertical construction next, systems after that. What it has not published is a commissioning schedule, an irradiation source plan or a date for the first sterile fly that actually leaves the building.

The plant's job is to make the releases independent of a facility 1,500 miles south. April 2027 is the date on the wall.