The gist of it is 4lbs 2row, 1lb of Munich, 5lb wheat malt, and a bit too much C40. Bitter with a charge of the Noble of your choice and 2oz of Cascade late, 5min and knockout. Widmer has become a lot clearer and less hoppy over the years, it used to look like the sort of coffee that people that don't like coffee drink and it had a pretty respectable Cascade presence. A tablespoon of flour after knockout will give it the sort of heavy, heavy haze it used to sport.
That'll get you in the ballpark. I think today's Widmer has backed off on the C40. Back then, most NW Ales had two primary flavors C40 and Cascade