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  • Lewis and Clark Visitor Center end of season, fall operating hours

    Lewis and Clark Visitor Center hours of operation will change beginning Saturday, Sept. 17.

  • U.S. Army Corps of Engineers invites volunteers to plant trees at W.P. Franklin Recreation Area on National Public Lands Day, Sept. 24

    ALVA, Fla. – The U.S. Army Corps of Engineers Jacksonville District invites the public to participate in a day of service at the W.P. Franklin Lock and Dam Recreation Area near Alva on National Public Lands Day, Saturday, September 24, from 7:30 a.m. through 4 p.m. Activities include planting close to 3,000 native trees to reforest open land, provide habitat restoration and educational opportunities for the local community. “We welcome volunteers of all ages to help us plant trees in an effort to reforest roughly 8.5 acres of land to create a natural Hardwood Hammock habitat at the W.P. Franklin Recreation Area as part of our Engineering with Nature Program,” said Col. James Booth, Jacksonville District Commander. This is the first of several opportunities that will be available to members of the local community who would like to volunteer to plant and restore native canopy and understory plants and grasses in an open area at the W.P. Franklin Recreation Area.”

  • Big Island Seepage Remediation Project substantially complete

    Congratulations to the Memphis District for completing a seepage remediation construction project on July 16, 2022. This much-needed project reduced seepage along the St. Francis River levee. Seepage remediation berms help prevent water from passing under levees, which can later lead to sand boils and threaten the overall integrity of the flood protection system.

  • MEDIA ADVISORY: Port Arthur Media Roundtable

    The Port Arthur Project, a component of the Sabine Pass to Galveston Bay Program (S2G Program), will host a media roundtable September 19, 2022, to provide an opportunity for media to ask the project delivery team questions about project progress.

  • Is Mean Discharge Meaningless for Environmental Flow Management?

    PURPOSE: River ecosystems are highly dependent on and responsive to hydrologic variability over multiple time scales (e.g., hours, months, years). Fluctuating river flows present a key challenge to river managers, who must weigh competing demands for freshwater. Environmental flow recommendations and regulations seek to provide management targets balancing socio-economic outcomes with maintenance of ecological integrity. Often, flow management targets are based on average river conditions over temporal windows such as days, months, or years. Here, three case studies of hydrologic variability are presented at each time scale, which demonstrate the potential pitfalls of mean-based environmental flow criteria. Each case study shows that the intent of the environmental flow target is not met when hydrologic variability is considered. While mean discharge is inadequate as a single-minded flow management target, the consequences of mean flow prescriptions can be avoided in environmental flow recommendations. Based on these case studies, a temporal hierarchy of environmental flow thresholds is proposed (e.g., an instantaneous flow target coupled with daily and monthly averages), which would improve the efficacy of these regulations.

  • Ecological Model Development: Evaluation of System Quality

    PURPOSE: Ecological models are used throughout the US Army Corps of Engineers (USACE) to inform decisions related to ecosystem restoration, water operations, environmental impact assessment, environmental mitigation, and other topics. Ecological models are typically developed in phases of conceptualization, quantification, evaluation, application, and communication. Evaluation is a process for assessing the technical quality, reliability, and ecological basis of a model and includes techniques such as calibration, verification, validation, and review. In this technical note (TN), we describe an approach for evaluating system quality, which generally includes the computational integrity, numerical accuracy, and programming of a model or modeling system. Methods are presented for avoiding computational errors during development, detecting errors through model testing, and updating models based on review and use. A formal structure is proposed for model test plans and subsequently demonstrated for a hypothetical habitat suitability model. Overall, this TN provides ecological modeling practitioners with a rapid guide for evaluating system quality.

  • Army Corps updates water release schedule for Francis E. Walter Dam

    The U.S. Army Corps Engineers’ Philadelphia District updated the 2022 Francis E. Walter Dam recreation plan. The Army Corps updated the plan, which states whitewater and fisheries releases will be scheduled if enough water storage is accumulated in the reservoir. Currently, there is enough water storage to schedule fisheries enhancement releases through Sept. 30.

  • MKARNS Nav Notice SWL 22-49 Sailing Instruction NM 179

    MKARNS - Mariners are advised that until further notice, both upbound and downbound tows should run the green line in the NM 179 vicinity.

  • Gate openings, guidelines announced for 2022, 2023 Raystown Hunting Seasons

    The U.S. Army Corps of Engineers (USACE) at Raystown Lake announces the opening of the following access roads to accommodate upcoming hunting seasons.

  • A Day at Sepulveda Dam

    ENCINO, California --U.S. Army Corps of Engineers Los Angeles District Park Rangers patrol Sepulveda Dam Aug. 19 in Encino, California.