Though for a time it proved an economic boon, logging was easily the most destructive form of land use the region was ever subjected to. The removal of forest cover and the skidding of logs down steep mountainsides caused widespread erosion. This weakened the foundation for regrowth and clogged streams with sediment, thereby reducing their quality for sustaining aquatic life. In the wake of logging came forest fires, probably the worst these mountains have seen. Heaps of dried branches trimmed from logs made perfect tinder for fires started by engine sparks, careless matches, or lightning strikes. In the 1920s disastrous fires roared up the East Prong of Little River, up Forney Creek to Clingmans Dome, and over the slopes around Charlies Bunion. Scars from some of these fires have still not healed today. What was the net biological effect of the presence of people in the mountains in 1926, the year Congress authorized Great Smoky Mountains National Park? Broadly speaking, the forest and its animals had been diminished but the plants and animals of grassland and brush had increased. The gray wolf was gone but the meadowlark had arrived. In 1930 the American people inherited lands that were still about 40 percent virgin forest, the largest such chunk of forest left in the East. The rest of the park was a patchwork of uncut forest, young second growth, and openings dotted with houses and barns and fringed with stone walls and fences. The park therefore preserved much of the primeval splendor of the Smokies, but the activities of people would long remain visible in it, and some of these would deliberately be maintained as part of the region’s historical heritage.