JUNEAU, Alaska -- The Coast Guard's Civil Engineering Unit from Juneau and Controlled Demolition, Inc., brought down Alaska's tallest structure at 1:30 p.m. Wednesday in Port Clarence using controlled explosives. The Long Range Aids to Navigation tower at the Coast Guard LORAN Station was the tallest of its kind in the country but the condition of the tower was deteriorating and with no funding for repairs the tower was at ever-increasing risk of an uncontrolled collapse. Alaska Public TeleCommunications tower in Knik 30 miles north of Anchorage will become the states tallest structure at 808 feet. U.S. Coast Guard video.