Lock and Dam 25 Expansion — Mississippi River, Winfield

Site work has started on a new 1,200-foot lock at Lock and Dam 25 near Winfield, Missouri, one of the first big builds under the Navigation and Ecosystem Sustainability Program on the Upper Mississippi. The St. Louis Engineer District awarded J.F. Brennan Company a $43.6 million contract on July 10 for site preparation and lock foundation work.

Project Scope
The existing 600-foot chamber dates to the 1930s and forces modern 15-barge tows to break apart and lock through in two cuts, a process that can add hours per transit. The new 1,200-foot lock lets a full tow pass in one lockage. Brennan’s package covers early excavation, cofferdam and foundation work in the river; later packages will build the chamber walls, gates, and mechanical systems. The broader NESP effort pairs navigation upgrades at several Upper Mississippi and Illinois River sites with ecosystem restoration, funded in part through the federal infrastructure law.

Why It Matters
Grain moving down the Mississippi competes on cents per bushel, and a two-cut lockage is a tax on every tow that hits it. Winfield sits on a stretch where delays ripple upriver into the farm belt during harvest. Replacing a 90-year-old chamber won’t grab headlines the way a new bridge does, but it’s the kind of unglamorous civil work that keeps export corn and soybeans price-competitive against South American origins. The first shovels here signal that NESP, authorized decades ago and starved of money for years, is finally turning into concrete.

Project Team & Details