A family enjoys Crater Lake, after climbing down the only trail that leads 1,000 feet down to the edge of the water. The water's temperature is typically about 68 degrees in summer, but can heat up to 74 degrees on hot days. It's as cool as 38 degrees near the bottom of the lake, but pockets of water at 68 degrees suggest hydrothermal activity, meaning the volcano is still active.
The last time the lake froze over was in 1949.
About a half a million tourists visit Crater Lake every year and the most common question among them is, "Are there fish in the lake?" Yes, according to park rangers.
William Gladstone Steel, an explorer who helped establish the lake as a national park, carried buckets of minnows into the lake after his first visit in 1885.
Only two species of fish--kokanee salmon and rainbow trout--out of more than 40 introduced to the lake have survived, however, and the populations are sparse. The public is allowed to fish in the lake without a license.
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