Rob Biller birding Musick's Campground, South Holston Lake, Sulivan County, TN 28 September 2014 Great Egret (2) Northern Rough-winged Swallow (Stelgidopteryx serripennis) (1) Tree Swallow (500) "Estimate - large migration flock over water and covering the small island and the 4?trees /bushes. Stayed for about 30 minutes and entire flock left." Cliff Swallow (1) Palm Warbler (7)