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Dive into the depths of Lake Tahoe knowledge with our comprehensive free 92-question trivia quiz with answers! Whether you're a local, frequent visitor, or simply fascinated by this iconic alpine lake straddling the California-Nevada border, this quiz will test your understanding of Lake Tahoe's geography, ecology, history, and unique characteristics. From its record-breaking depth to its famous attractions and wildlife, see how much you really know about one of America's most stunning natural wonders.
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Q 01The 1913 dam that controls the lake level stands at its only outlet, in which town?
Tahoe City
The dam regulates the flow into the Truckee River, which is the only river that leaves the lake.
Q 02What is the maximum depth of Lake Tahoe?
1,645 feet
Lake Tahoe's maximum depth is 1,645 feet, second in the United States only to Crater Lake at 1,949 feet.
Q 03What geological process, with volcanism and glaciation, formed the Lake Tahoe Basin?
Faulting
Blocks of crust rose to form the mountain ranges and dropped to form the basin between them, a vertical-motion normal fault.
Q 04At approximately what elevation above sea level does Lake Tahoe lie?
6,225 feet
Lake Tahoe's surface lies about 6,225 feet above sea level, roughly 1.2 miles up, straddling the California-Nevada line in the Sierra Nevada.
Q 05Which Native American tribe historically inhabited the Lake Tahoe Basin?
Washoe
Washoe people considered the lake the center of their territory and called it 'Dáʔaw', the root of the modern name 'Tahoe'.
Q 06What is the only river that flows out of Lake Tahoe?
Truckee River
The Truckee River, regulated by Lake Tahoe Dam at the outlet, is the only river that leaves the lake, and Tahoe's water never reaches the ocean.
Q 07Lake Tahoe holds enough water to cover the entire state of California to approximately what depth?
14 inches
Lake Tahoe holds about 39 trillion gallons, enough to cover a flat area the size of California to a depth of about 14 inches.
Q 08Before it was officially named Tahoe, what did the explorer who first sighted it in 1844 call it?
Lake Bonpland
The 1844 expedition named it Lake Bonpland after Aime Bonpland, the French botanist who travelled with Humboldt; the name never caught on, and 'Lake Bigler' displaced it for decades.
Q 09Approximately how old is Lake Tahoe?
2 million years
The basin's outline came from block movement of the crust, but the lake's modern shape was finished by the ice ages.
Q 10Approximately what percentage of Lake Tahoe's shoreline lies within California?
66%
Roughly two-thirds of the lake's perimeter is in California, with the remaining one-third in Nevada.
Q 11In 1955, Fred Rogers became the first person to do what at Lake Tahoe?
Swim its full length
Erline Christopherson became the first woman to match the feat in 1962.
Q 12Which interstate highway passes through Truckee, the usual freeway approach to Tahoe's north shore?
Interstate 80
Interstate 80 crosses the Sierra Nevada at Donner Pass and runs through Truckee, roughly 12 miles north of Lake Tahoe, where State Routes 89 and 267 turn south toward the north shore.
Q 13What is the highest summit in the Lake Tahoe Basin?
Freel Peak
Freel Peak, at 10,886 feet, is the highest summit in the Lake Tahoe Basin and the high point of both the Carson Range and El Dorado County.
Q 21Which resort south of the lake, with only 12% beginner terrain, is known for its advanced skiing?
Kirkwood
Kirkwood, about 35 miles south of South Lake Tahoe on State Route 88, rates only about 12% of its terrain for beginners and is known for steep chutes and expert runs.
Q 22Why does Lake Tahoe's main body never freeze over despite its 6,225-foot elevation?
Its huge thermal mass
Its huge thermal mass means so much water stores so much heat that the main body has never iced over, though sheltered bays such as Emerald Bay occasionally do.
Q 23Approximately how many tributaries feed into Lake Tahoe?
63
Q 14What major environmental impact did the 1859 Comstock Lode discovery have on the Lake Tahoe Basin?
Large-scale deforestation
Timber to shore up the Comstock mines came from the basin from about 1860 to 1890, and the large-scale deforestation took almost all of the native forest.
Q 15Which introduced fish, also known as mackinaw, is the prized big game fish of Tahoe's deep water?
Lake Trout
Lake trout, also called mackinaw, are not native to Tahoe; the species is actually a char rather than a true trout, and the rod-and-reel record for lake trout is 72 pounds.
Q 16Which famous explorer first sighted Lake Tahoe in 1844?
John C. Fremont
John C. Fremont, an American explorer, is credited with being the first non-Native American to see Lake Tahoe in 1844.
Q 17What volcanic feature dammed the northern outlet of the Lake Tahoe Basin, creating the lake?
Mount Pluto
Eruptions from the now-extinct volcano Mount Pluto formed a volcanic dam on the north side, which, along with snowmelt and rain, filled the basin to form Lake Tahoe.
Q 18Emerald Bay lies in which corner of Lake Tahoe?
Southwest
Emerald Bay sits in the southwest corner of Lake Tahoe, reached from State Route 89, and was designated a National Natural Landmark in 1969.
Q 19How many lakes in the United States hold more water than Lake Tahoe?
Five
Only the five Great Lakes hold more water than Lake Tahoe's roughly 36 cubic miles; Crater Lake is deeper but far smaller.
Q 20Diving in Lake Tahoe is rated advanced because its altitude raises the risk of what?
Decompression sickness
At 6,225 feet the lower surface pressure shortens no-decompression limits, so diving Lake Tahoe raises the risk of decompression sickness and requires altitude-adjusted dive tables.
Lake Tahoe is fed by 63 streams, which contribute a significant portion of its water, with the rest coming from direct precipitation.
Q 24Which 1960 event, held at Squaw Valley (now Palisades Tahoe), brought interstate highway links and a building boom to Lake Tahoe?
Winter Olympics
The 1960 Winter Olympics at Squaw Valley brought the interstate links, and with the mid-1950s casinos on the Nevada shore they set off a building boom; Squaw Valley was later renamed Palisades Tahoe.
Q 25What is the approximate surface area of Lake Tahoe in square miles?
191 sq mi
Lake Tahoe has a surface area of about 191 square miles (490 km²), making it one of the largest lakes in the United States by surface area.
Q 26Approximately how long is the Tahoe Rim Trail, which circles the entire lake?
165 miles
The Tahoe Rim Trail runs about 165 miles around the lake; roughly 50 miles above the west shore double as the Pacific Crest Trail, and it tops out at 10,338 feet on Relay Peak.
Q 27Which congressman and singer died after hitting a tree while skiing at Heavenly in January 1998?
Sonny Bono
Sonny Bono, by then a California congressman, struck a tree on a Heavenly run on 5 January 1998; Michael Kennedy had died the same way in Aspen days earlier, which is why the two are often confused.
Q 28What is the name of the lone islet in Emerald Bay, the only one anywhere on Lake Tahoe?
Fannette Island
Fannette Island, Lake Tahoe's only island, rises in Emerald Bay and carries the ruins of a stone teahouse built in the 1920s for the owner of the mansion at the head of the bay.
Q 29Which body of water does the Truckee River eventually flow into after leaving Lake Tahoe?
Pyramid Lake
The Truckee River is Lake Tahoe's only outlet, and it flows into Pyramid Lake in Nevada, which is a terminal lake with no outlet to the ocean.
Q 30Which formation on the southeastern shoreline is a sacred site for the basin's original inhabitants?
Cave Rock
Cave Rock, a prominent rock formation on the southeastern shore, is considered a sacred site by the Washoe people.