Mac and Cecile McDiarmid built one of their Clearwater River fishing camps at the foot of the White Horse Bluff in the late 1940s. It was nicknamed The Longhouse because it was long and wide. Only the ruins are left today. Eventually, the McDiarmids operated four cabins or fishing camps along the river and their home base on the Clearwater Valley Road was called Trophies Lodge. Hundreds of guests enjoyed wilderness vacations and the Clearwater's fabulous fishing over a 25-year period starting in 1945. About 1950, a guest at The Longhouse detected a cold draft blowing outward from some cracks near the base of the White Horse Bluff. The McDiarmids excavated a cavity about a meter deep and almost high enough for a standing person. This natural refrigerator kept ice solid even on the hottest of summer days and was a luxury in this remote place. It is still there today and, in September 2014, the temperature at the entrance was measured at 5 degrees Celsius.