In a large pot add water, potatoes, onion, carrots and celery. Bring to boil, turn down heat to a simmer, cover and cook for 12-15 minutes. Do not drain. In another pan melt the butter, stir in the flour, salt and pepper until smooth. add the milk gradually, stirring and cooking for a 2 minute boil until thickened. Add to the veggies and water. Stir in creamed corn, cheese and salmon. Heat for another 10 minutes or so until heated through.