Crater Lake — volcanic crater lake
m01229 from USA · CC BY-SA 2.0

Crater Lake

  • Elevation1,883 m
  • 2 min read
  • 42.944° N 122.107° W

Interesting facts

  • At 594 m Crater Lake is the deepest lake in the United States, and by average depth it is the deepest lake in the Western Hemisphere.
  • Rain and snow replace the lake's entire volume roughly every 150 years, balancing what evaporates and seeps away.
  • After the caldera formed, it took an estimated 720 years of rain and snowmelt to fill the lake to its present depth.
  • The Old Man of the Lake, a whole tree trunk, has floated upright in the water for more than a century, preserved by the cold.
  • The lake held no fish until 1888, when William Gladstone Steel began stocking it; of six species introduced, only kokanee salmon and rainbow trout survive.
  • Archaeologists have found sandals and other objects buried under Mazama's ash, proof that people lived here before the eruption.
  • Gold prospectors who saw it in 1853 named it Deep Blue Lake; it was later called Blue Lake and Lake Majesty before Crater Lake stuck.
  • The surface rarely freezes because the deep water stores summer heat, but in the bitter winter of 1949 the lake froze over completely for three months.
  • The eruption that formed the caldera threw out about 50 cubic kilometres of rhyodacite rock.
  • A submersible sent down in 1987 found beds of moss growing as deep as about 180 m below the surface.

Why it is worth it

Roughly 7,700 years ago, the volcano Mount Mazama did not just erupt — it collapsed. A catastrophic eruption blew out enough magma to empty the mountain's internal plumbing, and the whole summit caved in on itself, leaving the basin that filled to become Crater Lake. Ash from that eruption has been found as far away as Canada, making it one of the largest eruptions on Earth in the last 10,000 years. The Klamath people, whose ancestors witnessed it, preserved the event for millennia in an oral tradition describing a battle between the Chief of the Below World and the Chief of the Above World — very likely the oldest continuously told account of a specific natural disaster anywhere in North America.

What makes the lake itself remarkable is what it lacks: no river flows in, and none flows out. Every drop is rain or snowmelt, which means there's no sediment, no runoff, nothing to cloud the water — this is why Crater Lake holds the record as the clearest large body of water ever measured, with visibility once recorded to a depth of 44 meters. The deep blue color isn't paint or reflection; it's physics. Water absorbs red, orange and yellow wavelengths quickly, but blue light penetrates deep and scatters back up — and the deeper and purer the water, the more pronounced that effect becomes.

Wizard Island, the cone poking up from the lake's surface, is proof the story isn't over. It's a cinder cone that grew after the caldera had already filled, meaning volcanic activity continued even once the lake existed. The lake's water level has stayed remarkably stable for centuries, balanced almost exactly between precipitation coming in and evaporation plus underground seepage going out — a natural equilibrium that took millennia to settle into.

Best time to visit

The area is among the snowiest inhabited parts of the US, with roughly 13 meters of annual snowfall — the full Rim Drive around the caldera is usually open only from mid-June to October, and winter access is limited to snowshoe or ski routes.

Getting there

84 km from Klamath Falls. Rogue Valley International-Medford Airport (MFR) is about 89 km away.

On these lists

The Most Beautiful Places in Oregon 8The Most Beautiful Places in the United States 228The Most Beautiful Crater Lakes 20The Most Beautiful Water Wonders in the United States 30The Most Beautiful Water Wonders 429

From the encyclopaedia

Crater Lake is a volcanic crater lake in south-central Oregon in the Western United States. It is the main feature of Crater Lake National Park and is a tourist attraction known for its deep blue color and water clarity. The lake partly fills a 2,148-foot-deep (655 m) caldera that was formed around 7,700 years ago by the collapse of the volcano Mount Mazama. No rivers flow into or out of the lake; the evaporation is compensated for by rain and snowfall at a rate such that the total amount of water is replaced every 150 years. With a depth of 1,949 feet (594 m), the lake is the deepest in the United States. In the world, it ranks tenth for maximum depth, as well as fifth for mean depth.

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42.94361, -122.10667per Wikidata