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  • Pittsburgh District and city of Paden City partner for $2 million project

    The U.S. Army Corps of Engineers Pittsburgh District entered a partnership agreement with the city of Paden City, West Virginia, to upgrade sanitary sewer collection and treatment facilities as part of a $2 million Section 219 Environmental Infrastructure project, Thursday, Jan. 6.

  • Artificial Ground Freezing Using Solar-Powered Thermosyphons

    Abstract: Thermosyphons are an artificial ground-freezing technique that has been used to stabilize permafrost since the 1960s. The largest engineered structure that uses thermosyphons to maintain frozen ground is the Trans Alaska Pipeline, and it has over 124,000 thermosyphons along its approximately 1300 km route. In passive mode, thermosyphons extract heat from the soil and transfer it to the environment when the air temperature is colder than the ground temperature. This passive technology can promote ground cooling during cold winter months. To address the growing need for maintaining frozen ground as air temperatures increase, we investigated a solar-powered refrigeration unit that could operate a thermosyphon (nonpassive) during temperatures above freezing. Our tests showed that energy generated from the solar array can operate the refrigeration unit and activate the hybrid thermosyphon to artificially cool the soil when air temperatures are above freezing. This technology can be used to expand the application of thermosyphon technology to freeze ground or maintain permafrost, particularly in locations with limited access to line power.

  • Corps of Engineers set to perform maintenance at several locks this winter

    ST. PAUL, Minn. – The U.S. Army Corps of Engineers, St. Paul District, is preparing for major repairs at six of its Mississippi River locks this winter to ensure they continue working as designed.

  • Corps of Engineers hosts open house at Lock and Dam 10

    ST. PAUL, Minn. – The U.S. Army Corps of Engineers, St. Paul District, is hosting an open house at Lock and Dam 10, in Guttenberg, Iowa, Saturday, Sept. 25, in conjunction with GermanFest.

  • Corps announces additional temporary closures at Hastings lock and dam to replace nearly 80-year-old gates

    ST. PAUL, Minn. – The U.S. Army Corps of Engineers, St. Paul District, will have additional temporary closures at Lock and Dam 2 in Hastings, Minnesota, August 3 and 5 to properly align and seal the lock chamber’s new miter gates. The lock will be closed from 7 a.m. to 7 p.m.

  • Corps announces temporary closure at Hastings lock and dam to replace nearly 80-year-old gates

    ST. PAUL, Minn. – The U.S. Army Corps of Engineers, St. Paul District, will have four temporary closure periods at Lock and Dam 2 in Hastings, Minnesota, from July 20-29, to replace the lock chamber’s miter gates.

  • Corps of Engineers to host Lock and Dam 4 open house

    ST. PAUL, Minn. – The U.S. Army Corps of Engineers, St. Paul District, is hosting an open house at Lock and Dam 4, in Alma, Wisconsin, Saturday, July 31, to coincide with the city’s Swiss Heritage Days.

  • The Corps of Engineers hosts open house at Lock and Dam 6

    ST. PAUL, Minn. – The U.S. Army Corps of Engineers, St. Paul District, is hosting an open house at Lock and Dam 6, near Trempealeau, Wisconsin, Saturday, July 10, in conjunction with Catfish Days.

  • Pittsburgh District Awards First Contract for the Upper Ohio Navigation Project

    The U.S. Army Corps of Engineers Pittsburgh District announces the award of the first construction contract for the $1.8 billion Upper Ohio Navigation project.

  • Construction begins on the Vermilion Harbor east pier

    The U.S. Army Corps of Engineers, Buffalo District, and its contractor, Kovilic Construction Company Inc., began repairs of the Vermilion Harbor east pier, located in Vermilion, Ohio, on 11 June 2021. The current $1.825 million contract was awarded on September 30, 2020. The Corps of Engineers is using available funds to repair 216 feet of the most degraded section of the Vermilion Harbor east pier. Repair of the remaining degraded reach of the east pier is dependent upon receiving additional funding.