No prob fighting kings with 15 lb. line in reasonbly clean areas. But those that have fought huge fresh kings right in from the nearby ocean in the lower ends of the narrow, strong current, and very branch snagy Tillamook area rivers know that it's about the biggest salmonid fighting challenge there is (and I've fought a heck of a lot of them up in AK/BC). You can always get lucky, but with less than 20 lb. line in those conditions most of them will spank your ass baboon red! The few fish that don't run for the tree branches along both sides of the river down there, and stay out in the middle, would still take you a very long time to land with 15 lb. Maxima line - some might even go find a honey and spawn while you goof around with that light stuff near T-town.