OLD FAITHFUL Old Faithful erupts more frequently than any of the other big geysers, although it is not the largest or most regular geyser in the park. Its average interval between eruptions is about 76 minutes, varying from 45 to 110 minutes. An eruption lasts 1 1/2 to 5 minutes, expels 3,700 to 8,400 gallons (14,000 to 32,000 liters) of boiling water, and reaches heights of 106 to 184 feet (30 to 55m). It was named for its consistent performance by members of the Washburn Expedition in 1870. Although its average interval has lengthened through the years (due to earthquakes and vandalism), Old Faithful is still as spectacular and predictable as it was a century ago. In this QTVR, visitors standing between Old Faithful and the Old Faithful Inn watch the geyser erupt. Built during the winter of 1903-04, the Old Faithful Inn was designed by Robert C. Reamer, who wanted the asymmetry of the building to reflect the chaos of nature. The lobby of the hotel features a 65-foot ceiling, a massive rhyolite fireplace, and railings made of contorted lodgepole pine. Wings were added to the hotel in 1915 and 1927, and today there are 327 rooms available to guests in this National Historic Landmark.