TULSA, Oklahoma, Dec. 31 -- The U.S. Army Corps of Engineers-Tulsa District issued the following news: * * * From riverbed to supply chain: how accurate surveys benefit commerce and consumers Navigation is a key mission for the U.S. Army Corps of Engineers, Tulsa District. Below the surface of the McClellan-Kerr Arkansas River Navigation System, conditions constantly change. As water levels rise and fall, sediment shifts, and unseen hazards can quickly turn a safe passage down the river into   more