Bear Spring is an unincorporated community in Stewart County, Tennessee, in the United States. In 1830, the Bear Spring Iron Furnace was constructed, serving as the first charcoal cold-blast furnace in the area. At its peak work rate in 1850, the furnace could produce over 2000 tons of metal. The furnace closed down in 1854 and was destroyed b…Bear Spring is an unincorporated community in Stewart County, Tennessee, in the United States. In 1830, the Bear Spring Iron Furnace was constructed, serving as the first charcoal cold-blast furnace in the area. At its peak work rate in 1850, the furnace could produce over 2000 tons of metal. The furnace closed down in 1854 and was destroyed by Union Troops in 1864. It was reconstructed at its current location in 1873, where it has remained ever since.