David McNew/Getty ImagesThe Forest Service oversees thousands of buildings that are unused, many that are falling apart, full of mold, and pose safety hazards, according to a new audit. The inspector general for the US Department of Agriculture found that the Forest Service has compiled over $5 billion worth of repairs to buildings, roads, dams, and trails it operates. Officials admit they are becoming a "national junkyard" by overseeing thousands of decrepit buildings the government does not need. "During our fieldwork, we observed [Forest Service] buildings that were not inspected as well as buildings that forest officials stated had structural issues, mold growth, wide-spread rodent droppings, and other health and safety concerns including 20 buildings with concerns so severe that officials referred to them as ‘red tagged,'" the inspector general reported. "Red tag" refers to buildings and structures that are so unsafe they are closed. Some buildings had asbestos, and one residential building observed by auditors had a 15-foot hole in the roof, as well as mold and fire damage. "As a result, unsafe structures can pose health and safety risks, such as hantavirus or other concerns, to [Forest Service] employees and the public," the inspector general said. The Forest Service manages almost 40,000 administrative, recreation, and research buildings.