So different is this spectacle from anything else upon the continent that the first question asked usually is how it came to be. The answer discloses one of the most dramatic incidents in the history of the earth.
In the evolution of the Cascades, many have been the misadventures of volcanoes. Some have been buried alive in ash and lava, and merged into conquering rivals. Some have been buried in ice which now, organized as glaciers, is wearing down their sides. Some have died of starvation and passed into the hills. Some have been blown to atoms. Only one in America, so far as known, has returned into the seething gulf which gave it birth. That was Mount Mazama.
The processes of creation are too deliberate for human comprehension. The Mississippi takes five thousand years to lower one inch its valley's surface. The making of Glacier National Park required many—perhaps hundreds—of millions of years. It seems probable that the cataclysm in which Mount Mazama disappeared was exceptional; death may have come suddenly, even as expressed in human terms.
What happened seems to have been this. Some foundation underpinning gave way in the molten gulf below, and the vast mountain sank and disappeared within itself. Imagine the spectacle who can! Mount Mazama left a clean-cut rim surrounding the hole through which it slipped and vanished. But there was a surging back. The eruptive forces, rebounding, pushed the shapeless mass again up the vast chimney. They found it too heavy a load. Deep within the ash-choked vent burst three small craters, and that was all. Two of these probably were short-lived, the third lasted a little longer. And, centuries later, spring water seeped through, creating Crater Lake.
Crater Lake is set in the summit of the Cascade Range, about sixty-five miles north of the California boundary. The road from the railway-station at Medford leads eighty miles eastward up the picturesque volcanic valley of the Rogue River. The country is magnificently forested. The mountains at this point are broad, gently rolling plateaus from which suddenly rise many volcanic cones, which, seen from elevated opens, are picturesque in the extreme. Each of these cones is the top of a volcano from whose summit has streamed the prehistoric floods of lava which have filled the intervening valleys, raising and levelling the country.
CROSS-SECTION OF CRATER LAKE SHOWING PROBABLE OUTLINE OF MOUNT MAZAMA