07/08/14 TN NWR - Duck River Unit Pool 3 and 4 Humphreys County Observed a single solitary sandpiper in Pool 4 right along the auto tour loop and heard a lesser yellowlegs in Pool 3. *The Duck River Unit will be closed to all access Wednesday and possibly Thursday of this week for aerial treatment of non-native invasive wetland plants that are covering waterfowl and shorebird habitat.* Clayton Ferrell