• Monitoring the Milwaukee Harbor Breakwater: An Engineering With Nature® (EWN®) Demonstration Project

    Abstract: The US Army Corps of Engineers (USACE) maintains breakwaters in Mil-waukee Harbor. USACE’s Engineering With Nature® (EWN®) breakwater demonstration project created rocky aquatic habitat with cobbles (10–20 cm) covering boulders (6–8 metric tons) along a 152 m section. A prolific population of Hemimysis anomala, an introduced Pontocaspian mysid and important food source for local pelagic fishes, was significantly (p < .05) more abundant on cobbles versus boulders. Food-habits data of ale-wife (Alosa pseudoharengus) and rainbow smelt (Osmerus mordax) pro-vided evidence that H. anomala were a common prey item. Night surveys and gill netting confirmed O. mordax preferred foraging on the cobbles (p < .05) and consumed more H. anomala than at the reference site (p < .05). H. anomala comprised a significant portion of the diets of young-of-the-year (YOY) yellow perch (Perca flavescens), YOY largemouth bass (Micropterus salmoides), and juvenile rock bass (Ambloplites rupestris) caught on the breakwater. The natural features’ construction on the break-water increased the available habitat for this benthopelagic macroinverte-brate and created a novel ecosystem benefiting forage fish and a nursery habitat benefiting nearshore game fish juveniles. These data will encour-age the application of EWN concepts during structural repairs at other built navigation infrastructure.
  • Ice Fog Monitoring Near Fairbanks, AK

    ABSTRACT:  Ice fog events, which occur during the Arctic winter, result in greatly decreased visibility and can lead to an increase of ice on roadways, aircraft, and airfields. The Fairbanks area is known for ice fog conditions, and previous studies have shown these events to be associated with moisture released from local power generation. Despite the identified originating mechanism of ice fog, there remains a need to quantify the environmental conditions controlling its origination, intensity, and spatial extent. This investigation focused on developing innovative methods of identifying and characterizing the environmental conditions that lead to ice fog formation near Fort Wainwright, Alaska. Preliminary data collected from December 2019 to March 2020 suggest that ice fog events occurred with temperatures below −34°C, up to 74% of the time ice fog emanated from the power generation facility, and at least 95% of ice particles during ice fog events were solid droxtals with diameters ranging from 7 to 50 µm. This report documents the need for frequent and detailed observations of the meteorological conditions in combination with photographic and ice particle observations. Datasets from these observations capture the environmental complexity and the impacts from energy generation in extremely cold weather conditions.
  • Investigating the USACE Operational Condition Assessment Process Current and Future

    Abstract: The US Army Corps of Engineers operates, maintains, and manages more than $232 billion worth of the Nation’s water resource infrastructure and relies on the Operational Condition Assessment (OCA) process to determine the condition of the assets and their components. The sheer number of components, all of equal OCA scheduling priority, creates challenges in ensuring that assessments are conducted in a timely manner and that data generated are of sufficient quality to inform resource allocation decisions. This research applied methods from systems design to determine the OCA system “as-is” state and create a stakeholder-informed vision of a “to-be” state that addresses current system challenges. To meet its objective of providing current assessments of asset condition, the OCA system must provide four high-level functions: provide access to asset data, conduct assessments, determine asset risk, and prioritize and schedule assessments. The development of capabilities to provide these functions will facilitate the achievement of the OCA system to-be vision: a consistent view of asset condition and risk across the enterprise.
  • West Hill Dam in Uxbridge, Massachusetts, now accepting picnic shelter reservations for summer recreation season

     The U.S. Army Corps of Engineers, New England District announced today that West Hill Dam in
  • Corps repairing toe maintenance roads along LA River near Glendale

    The U.S. Army Corps of Engineers Los Angeles District is working on a toe repair project along the Los Angeles River near Glendale.
  • Alaska District wins Army Environmental Award for Second Consecutive Year

    Climbing up the hillside of a remote Alaskan island, an old tramway rusts into the ground beneath it. With gnarled rails, the 2,400-foot structure is a remanent of an abandoned radar facility that provided early warning of approaching enemy aircraft during World War II. The tramway is part of a formerly used defense site that the U.S. Army Corps of Engineers – Alaska District worked to clean up the past two summers.
  • Corps general tours military, DOD, VA projects during weeklong visit to California

    LOS ANGELES – One of the U.S. Army Corps of Engineers’ top generals for military and international operations made his first visit to Southern California during a weeklong tour of some of the agency’s Los Angeles District projects. Maj. Gen. Jeffrey Milhorn, the Corps’ deputy commanding general for Military and International Operations, toured several project sites across the desert and the coastline – from the National Training Center at Fort Irwin to Vandenburg Air Force Base – during his visit to California.
  • MKARNS Nav Notice SWL 21-16 Lock 9 Reopened

    MKARNS - Arthur V. Ormond Lock (No. 9) NM 176.9 has reopened to navigation traffic.
  • MKARNS Nav Notice SWL 21-15 Lock 8 Reopened

    MKARNS - Toad Suck Ferry Lock (No. 8) NM 155.9 has reopened to navigation traffic.
  • USACE begins a land acquisition study for Beaver Lake

    The U.S. Army Corps of Engineers announces that it is beginning a study to assess the potential impacts of frequent flooding along the public-private shared boundary on Beaver Lake.