Crater Lake National Park
Crater Lake National Park is a United States National Park located in southern Oregon, whose primary feature is Crater Lake. This National Park was established on May 22, 1902, and it is the sixth oldest National Park in the U.S. This park encompasses the Crater Lake caldera, which rests in the remains of a destroyed volcano (eventually named Mount Mazama) and the surrounding forestland and hills. This is the only National Park in Oregon.

The lake is 1,949 feet deep at its deepest point[3], which makes it the deepest lake in the United States, the second deepest in North America and the ninth deepest in the world. However, when comparing its average depth of 1,148 feet (350 m) to the average depth of other deep lakes, Crater Lake becomes the deepest in the Western Hemisphere and the third deepest in the world. The impressive average depth of this volcanic lake is due to the nearly symmetrical 4,000-foot (1,200 m) deep caldera formed 7,700 years ago during the violent climactic eruptions and subsequent collapse of Mt. Mazama and the relatively moist climate that is typical of the crest of the Cascade Mountains.

The caldera rim ranges in elevation from 7,000 to 8,000 feet. The United States Geological Survey benchmarked elevation of the lake surface itself is 6,178 feet. This National Park covers 286 square miles. Crater Lake has no streams flowing into or out of it. All water that enters the lake is eventually lost from evaporation or subsurface seepage. The lake's water commonly has a striking blue hue, and the lake is re-filled entirely from direct precipitation in the form of snow and rain.

Crater Lake Activies
There are many hiking trails inside the park, and several campgrounds. Unlicensed fishing is allowed without any limitation of size, species, or number. The lake is believed to have no indigenous fish, but several species of fish were introduced beginning in 1888 until all fish stocking ended in 1941. Kokanee Salmon and Rainbow Trou now thrive and reproduce here naturally. Swimming is allowed in the lake, and the boat tours, which stop at Wizard Island a cinder cone inside the lake, operate daily during the summer. All lake access for people is from Cleetwood Trail, a steep walking trail, and there are no roads for cars, trucks, or wagons that lead to the waterfront. All of the boats in the lake were delivered by helicopter.
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Numerous observation points along the caldera rim for the lake are readily accessible by automobile via the "Rim Drive", which is 33 miles long and has an elevation gain of 3,800 feet.

The highest point in Crater Lake National Park is Mt. Scott at 8,929 feet. Getting there requires a fairly steep 2.5-mile hike from the Rim Drive trailhead. On a clear day visibility from the summit exceeds 100 miles, and one can, in a single view, take in the entire caldera. Also visible from this point are the white-peaked Cascade Range volcanoes to the north, the Columbia River Plateau to the east, and also the Western Cascades and the more-distant Klamath Mountains to the west.

The scenery of Crater Lake is fully accessible during the summer months. Heavy snowfalls in this park during the fall, winter, and spring months force many road and trail closures, including the popular "Rim Drive", which is generally completely open from July to October, and partially open in some other months, such as May, June, and November.