 Though most of the Old Faithful complex had been spared, the park service decided that for the first time, the entire park would be closed to non-emergency personnel on September 8.The night of the 9th and the morning of September 10, the North Fork fire jumped a fireline along its northeastern flank and approached Mammoth Hot Springs where a large concentration of historical structures as well as the Park Headquarters is located.Rain and snow arrived in time to slow the fires before they threatened the complex.