Actually they are indications of pure air but also lichen on a tree indicates that the tree may be in declining health. Lichen is a combination of algae and fungus and grows very very slowly. Moss is an indication that there needs to be some better air circulation on that tree. Consider a good pruning in early spring.aving lichens and moss on your tree is an indication that the air around your tree is healthy and clean. They do not harm the tree. They have synergistic relationships with the biosphere of the tree that are more interesting if you leave them there.
Officials said Nevadaâs Lake Mead, the 79-year-old reservoir created by the massive Hoover Dam, registered 1,074.98 feet (327.7 meters) above sea level late on Tuesday, but was able to rise above a critical mark by early on Wednesday morning.
Canyon Lake. Canyon Dam and Reservoir, located on the Guadalupe River, Comal County, is a joint project between the U.S. Army Corps of Engineers and the Guadalupe-Blanco River Authority (GBRA) . The dam was built for two reasons: 1) to control flood events that originated in the watershed of the Guadalupe River in the Texas Hill Country. 2) for GBRA to have a stored supply of water available for citizens in the Guadalupe River Basin during times of drought. Built in the early 1960's, the dam is constructed of rolled, compacted earth.