17 Sep 2025

Spring House, 666 Front Street, Lahaina, Hawaiʻi: Historic American Buildings Surveys HI-676

Abstract: The US Congress codified the National Historic Preservation Act of 1966 (NHPA), the nation’s most effective cultural resources legislation to date, mostly through establishing the National Register of Historic Places (NRHP). The NHPA requires federal agencies to address their cultural resources, which are defined as any prehistoric or historic district, site, building, structure, or object. Section 110 of the NHPA requires federal agencies to inventory and evaluate their cultural resources, and Section 106 requires them to determine the effect of federal undertakings on those potentially eligible for the NRHP. Lahaina is located in the western part of Maui County, in Hawaiʻi. The Spring House, erected circa 1823, is currently scheduled for demolition due to its major fire damages. This report documents the building to the standards of the Historic American Buildings Survey and includes a historic context, architectural descriptions, photographs, and measured drawings. This report satisfies Sections 106 and 110 of the National Historic Preservation Act of 1966 as amended and will be used by FEMA to document the building before its demolition.

17 Sep 2025

Vehicle Barrier Application for Soft Asset Protection at US Army Corps of Engineers (USACE) Dam Facilities

Abstract: The US Army Corps of Engineers (USACE) operates recreational areas at more than 400 lakes and river projects in 43 states. The rise of vehicular ramming attacks, in addition to attacks from vehicle-borne improvised explosive devices (VBIEDs), necessitates physical security measures to protect soft assets at these facilities. Therefore, a comprehensive vehicle-control plan, which includes the appropriate placement of effective vehicle barriers, is important for dam owners and operators to maintain safety at their facilities. This guide consolidates requirements, standards, and the design basis for barriers from multiple sources to provide dam owners with a resource to better protect against vehicular threats.

16 Sep 2025

Quality Control for Waterway Networks: Processing Algorithm and GIS Toolbox

Purpose: This Coastal and Hydraulics Engineering technical note (CHETN) documents the development of a US centered Geographic Information System (GIS) representation of navigable waterways for research purposes, including connections with the US Army Corps of Engineers (USACE) National Channel Framework (NCF) reaches, depths, and international connections, and the “Quality Control for Waterway Networks” processing algorithm. The algorithm is an automated method to update a waterway network created by the Coastal and Hydraulics Laboratory (CHL). After a user introduces desired changes to an input line layer representing waterways, the algorithm outputs links and nodes’ shapefiles containing a fully connected network, with geometries and depths aligned with the NCF, and controls for topology and attributes quality. In addition, spatial joins assign attributes to network nodes from other various sources of data. The product of this work is a GIS waterway network, along with a Quality Assurance and Quality Control (QAQC) script incorporated via toolbox within an open-source GIS software to maintain the waterway network updated. The algorithm has the capacity to be adapted to other transportation network needs or GIS software packages.

16 Sep 2025

Review of Threatened and Endangered Plant Species Potentially Impacting US Army Corps of Engineers Mission Areas

Abstract: This special report summarizes federally threatened and endangered plant species that have most affected recent or ongoing US Army Corps of Engineers (USACE) projects in terms of dollars spent on research, management, and mitigation. We also assess which of these highest cost-associated species are most likely to benefit from further research and conservation efforts, with the goals of species recovery and delisting.

16 Sep 2025

Standard Operating Procedures for the Design, Maintenance, and Operation of Arctic and Subarctic Winter Roads

Abstract: Operations in cold regions require vehicular maneuvering across snowpacks or frozen surfaces. Winter roads and their route determination, construction, and monitoring are widely studied. This report analyzes historical and current literature on winter road construction and operations, reviews risk assessment techniques, examines the impact of uncertain weather on road reliability, and provides a standard operating procedure for design, maintenance, and use. Winter roads, snow roads, ice roads, and ice bridges enable seasonal access in Arctic and Subarctic regions. They allow cross-country maneuverability over terrain like wetlands and bogs, which are impassable in summer. These roads are critical for training, logistics, and construction in areas without all-season access. When combined with ice bridges they can provide near-unlimited travel. Effectiveness depends on proper planning, construction, and monitoring. Snow roads require controlled compaction for strength, while ice roads require sufficient ice thickness to support loads. Both rely on tools like visual inspections, ground-penetrating radar, and unmanned aerial systems to ensure safety. With extreme seasonal variability, adaptive strategies are essential. Shortened seasons and unpredictable freeze–thaw cycles demand modern technologies, predictive weather modeling, and improved reinforcement. This report integrates historical knowledge with engineering advancements to improve winter road durability, reduce risks, and support cold-region operations.

15 Sep 2025

Foliar Fungal Assemblages Associated with Diploid and Triploid Butomus umbellatus Populations in the United States

Purpose: Novel associations between plant invaders and fungi may moderate invader impacts if fungi are pathogenic or contribute to variation in invader response to management. Identifying and quantifying species associations with plant invaders can have management consequences. However, whether novel fungal associations and resulting assemblages are shaped by invader genetics is largely unknown. The goal of this research was to identify community patterns of foliar fungi associated with diseased and healthy diploid and triploid Butomus umbellatus (flowering rush) cytotypes in the United States. A total of 12 diploid and 9 triploid Butomus umbellatus L. populations in 10 states across the northern United States were surveyed, foliar fungi were isolated from healthy and diseased leaves, and a fungal assemblage structure analysis was conducted to determine whether assemblages were unique to B. umbellatus cytotypes. Differences in flowering rush–associated fungal assemblages and complex interaction between fungal taxa may promote uneven invasion between cytotypes in the United States and guide future management efforts to reduce the negative impacts caused by B. umbellatus invasions.

15 Sep 2025

Standard Operating Procedures for the Design, Construction, and Maintenance of Linear Infrastructure in Fens in Cold Regions

Abstract: In Alaska and across the Arctic and Subarctic, winter conditions can enable the expansion of linear infrastructure across the frozen landscape of fen wetlands. This expands military training opportunities into lowland wet, boggy, mostly impassable terrain. However, there are personnel, civilian, and environmental risks from using fens as travel corridors and drop zones. The effective design, construction, operation, and maintenance of such infrastructure on fens supports the dual mandate of troop training to fulfill the mission and protect the environment. This Technical Report (TR) addresses the risks of the establishment and use of linear infrastructure on the DoD lands in Alaska and in other austere cold environments where the DoD operates. This TR is founded on a review of methods used by US Army Installations, focusing primarily on Fort Wainwright in Interior Alaska. It establishes basic standard operating procedures (SOPs) by drawing on federal agency and international best practices and emerging research in circumpolar regions and beyond. This TR serves as a reference document for military land and infrastructure planners and unit leadership to create and maintain linear infrastructure on fens as environmental challenges evolve and opportunities develop to further the Army mission in high latitude environments.

15 Sep 2025

Standard Operating Procedures for the Design, Maintenance, and Operation of Freshwater Ice Bridges

Abstract: Operations in cold regions inevitably require maneuvering across, through, or atop frozen surfaces. Ice bridges are special components of winter linear infrastructure that can have significant impacts on mission targets. Proper siting, design, monitoring, and operation of ice bridges reduces potential environmental impacts and decreases risks to personnel and equipment. The US Army operates multiple ice bridge crossings on training lands in Alaska and collaborates with other countries in training events that use them. They are a likely means of travel for potential operations in cold regions. However, the US Army lacks up to date guidance on the design, maintenance, and operation of ice bridges. This report addresses this need by providing a set of standard operating procedures that have been developed from a broad synthesis of ice bridge usage in northern regions. In addition, it reviews all relevant historic and current literature regarding ice bridges, describes risk assessment and mitigation techniques for ice bridge operations, discusses specific considerations for US Army training areas in Alaska, and briefly describes important ramifications of changing weather conditions and increasing uncertainty as they relate to ice bridge life span.

15 Sep 2025

Fiber-Reinforced-Polymer (FRP) Composite Sandwich Panel Barge Impact Modeling and Repair Testing: Dynamic and Static Finite Element Analysis (FEA) Predictions for Impact and Flexural Testing Validated with Experiments

Abstract: The US Army Engineer Research and Development Center has studied the functionality, durability, and structural integrity of fiber-reinforced-polymer (FRP) composite materials in civil works infrastructure. Compared to traditional materials like steel, composites offer a high strength-to-density ratio and excellent resistance to environmental degradation. The purpose of this study is to evaluate the dynamic response of FRP composite sandwich panels subjected to a barge impact with typical masses and velocities. A finite element model was created for FRP composite sandwich panels by incorporating cohesive interaction properties to evaluate the damage between three-dimensional (3D) layers. To validate the model, several FRP composite sandwich panels were experimentally subjected to low-velocity impacts and compared to the models. Moreover, flexural experiments were performed to determine the reduction of structural performance after impact and the efficacy of two different repair methods. Numerical predictions were developed to explore the damage caused by the interfaces of FRP composite layers. Load, deflection, and velocities were obtained experimentally and with finite element models.

12 Sep 2025

Veterans Administration Fourth Generation Historic Context

Abstract: The period of significance for fourth generation of Veterans Administration (VA) medical centers ranges from 1955 to 1977. This period encapsulates a surge of VA medical center construction with congressional funding, dating from the release of the 1955 congressional report Nonbed Betterments in Veterans Administration Hospitals—Need for Renovation and Construction to the adoption of the Veterans Administration Medical Facilities Acquisition Act of 1977. New medical centers constructed by the VA during this time may be eligible under Criterion A for their association with health care and medicine, specifically the development of education and research relationships with medical schools. These partnerships advanced therapies, technology, and hospital operation in support of the VA’s mission to provide quality medical care for veterans. To support these partnerships, VA medical centers were commonly built adjacent to or within medical school complexes. Additionally, fourth generation VA medical centers may be eligible under Criterion C for embodying distinctive architecture or landscape architecture characteristics of mid-century modern hospitals or representing an important contribution in a significant architect’s career. This report provides a comprehensive historic context for the design, construction, and operation of new fourth generation VA medical centers in support of Section 110 of the National Historic Preservation Act of 1966 (NHPA). It does not include other VA medical facilities constructed during this period, such as psychiatric and rehabilitation centers, nursing homes, domiciliaries, and research and education buildings.