A Coast Guard Sector Columbia River, Ore., MH-60 Jayhawk helicopter crew lowers a 14-foot navigation tower to Aids to Navigation Team Astoria, Ore., for placement on a large rock at the entrance to Cathlamet South Channel, just yards from Tongue Point in Astoria, on the Columbia River. The tower is a major component of the aid to navigation that now marks the channel and steers mariners clear of the rock. (U.S. Coast Guard photo by Petty Officer 3rd Class Nate Littlejohn)