• USACE performs routine high pool inspection of Terminus Dam

    The U.S. Army Corps of Engineers Sacramento District conducted a routine high pool inspection of
  • CERP Science Driven Restoration

    JACKSONVILLE, Fla. May 31, 2024 --- U.S. Army Corps of Engineers Jacksonville District reflects on the hard work and dedicated efforts of their state partners as well as the scientist and engineers within USACE and their unwavering commitment to Everglades restoration. USACE, and its state partners are making strategic efforts to restore, rehabilitate and reverse the damage inflicted in the past. This mission is no small task, the Comprehensive Everglades Restoration Plan (CERP) is an intensive project with far-reaching impacts on both the Everglades and its diverse wildlife, as well as the entire population of Florida.
  • CERP Science Driven Restoration

    JACKSONVILLE, Fla. May 31, 2024 --- U.S. Army Corps of Engineers Jacksonville District reflects on the hard work and dedicated efforts of their state partners as well as the scientist and engineers within USACE and their unwavering commitment to Everglades restoration. USACE, and its state partners are making strategic efforts to restore, rehabilitate and reverse the damage inflicted in the past. This mission is no small task, the Comprehensive Everglades Restoration Plan (CERP) is an intensive project with far-reaching impacts on both the Everglades and its diverse wildlife, as well as the entire population of Florida.
  • Corps, city celebrates San Clemente beach expansion

    The City of San Clemente hosted a ribbon-cutting ceremony to celebrate the reopening of part of its expanded beach May 31 in San Clemente. The event occurred following the completion of Phase One of the San Clemente Beach Nourishment project, which aims to reduce coastal storm damage along the city’s shoreline.
  • MKARNS Nav Notice No. SWL 24-47 Lock 5 Reopened

    The Tainter valve equipment at Colonel Charles D. Maynard Lock (No. 5) NM 86.3 was repaired and the Lock is currently open to traffic.
  • Port of Umatilla provides tree maintenance, gravel, playgrounds for real estate contract transaction

    WALLA WALLA, Wash. – The Port of Umatilla paid $460,000 of in-kind services to the U.S. Army Corps of Engineers Walla Walla District for a real estate contract transaction. This is one of the largest in-kind consideration agreements the district has ever worked.
  • Single lane closure scheduled for Highway 25 across Greers Ferry Dam

    The U.S. Army Corps of Engineers is scheduling a single lane closure of the Highway 25 bridge across Greers Ferry Dam from 8 a.m. until 4 p.m. June 13, 2024, for routine maintenance.
  • USACE cautions lake users of potential storm debris hazards on Beaver Lake

    The U.S. Army Corps of Engineers is cautioning lake users about potential storm debris hazards on Beaver Lake following the May 2024 storms.
  • MKARNS Nav Notice No. SWL 24-46 Lock 5 Unscheduled Lock Closure

    Due to issues with the Tainter valve equipment, Colonel Charles D. Maynard Lock (No. 5) NM 86.3 is currently closed to traffic.
  • pH Pivoting for Algae Coagulation: Bench-Scale Experimentation

    Abstract: Harmful algal blooms (HABs) threaten recreational waters and public supplies across the US, causing detrimental economic and environmental effects to communities. HABs can be mitigated with dissolved air flotation (DAF) treatment, which requires addition of pH-sensitive charged chemicals to neutralize algae, allowing them to attach to microbubbles and float to the surface. During HAB events and photosynthesis, algae raise the pH to levels that are not ideal for DAF. Traditionally, pH is reduced with a strong acid; however, this adds operational cost and permanently adjusts the water’s pH. This study assessed an approach that might allow for infusing CO₂ from diesel-powered electricity generators into the water prior to DAF treatment. It was hypothesized that formation of carbonic acid could temporarily reduce the pH. Results showed that 2.5%–5.0% CO₂ mixed within compressed air can achieve pH levels between 6–7 in algal water with an initial pH of 9–11 and alkalinity of 150 mg/L as CaCO₃. Further, dosing CO₂ before chemical addition yielded a 31% improvement in water clarification. Returning the pH back to natural levels was not achieved using ambient air microbubbles; however, coarse bubble air spargers should be tested to provide more volumetric capacity for CO₂ absorption.