This study assesses the entire life cycle of large onshore wind turbines in the US, covering all stages from material acquisition to disposal. Various impacts on the environment, human health, and resource consumption were considered.  The focus is on transparently examining the installation and maintenance phases. This study is unique as it considers factors specific to the US, such as transport distances, truck emission standards, electricity sources, and waste disposal practices. It is also the first to analyze all six phases of the turbine's life cycle separately and evaluate the turbine's lifespan as a sensitivity parameter.  The study focused on 200 Gamesa 2-MW wind turbines near Abilene, Texas, using SimaPro8 software and ISO 14040 standards. Manufacturing had the highest overall impact, followed by installation, transportation, maintenance, and raw material acquisition. End-of-life impacts ranked last, indicating that the disposal method for non-recycled turbine parts has minimal effect on the overall life cycle.