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"Tahoe" redirects here. For the SUV, see Chevrolet Tahoe. Lake Tahoe is a freshwater lake in the Sierra Nevada, located where the borders of the U.S. states of California and Nevada bend, near Carson City. Approximately two-thirds of the shoreline is in California. The area, referred to as Tahoe, is home to a number of ski resorts and summer outdoor recreation. It is the second deepest lake in the United States, the eleventh deepest on Earth, and the fourth deepest in average depth.
Geography
History Tahoe’s history began 2–3 million years ago when the faults that created the Carson Range simultaneously molded the Tahoe Basin. Eruptions from the extinct volcano Mt. Pluto formed a dam on the north side. The Pleistocene (Ice Age) molded the basin to its current form followed by drainage from ice and snow which filled the lake. The area around Lake Tahoe was originally inhabited by the Washoe tribe of Native Americans. Lake Tahoe was the center and heart of Washoe Indian territory, including the upper valleys of the Walker, Carson, and Truckee Rivers. They called this area "Da ow a ga", which means "edge of lake". When early pioneers came they mispronounced this word, saying "Da ow", it later evolved into what we call it today, Lake "Tahoe".. Lt. John C. Frémont and Kit Carson were the first non-indigenous people to see Lake Tahoe. It was Fremont's 2nd exploratory expedition. On February 14, 1844, while searching for the Bonaventura river he first sighted the lake from Red Lake Peak in what is now the Carson Pass. After arriving at Sutter's Fort he designated it Lake Bonpland, in honor of the French explorer and botanist Aimé Jacques Alexandre Bonpland. John Calhoun Johnson, Sierra explorer and founder of "Johnson's Cutoff" (now Hwy 50), was the first white-man to see Meeks Bay and from a peak above the lake he named "Fallen Leaf Lake, California" after his Indian guide. His first employment in the west was in the government service, carrying the mail on snowshoes from Placerville to Nevada City, during which time he gave the name of Lake Bigler to that beautiful body of water now known as Lake Tahoe in honor of California’s governor John Bigler. In 1853 William Eddy, the surveyor general of California, identified Tahoe as Lake Bigler. In 1862 the U.S. Department of the Interior first introduced the name Tahoe which continued a debate about naming the lake, in which both names were used until well into the next decade. It wasn’t until 1945 that it was finally and officially named Lake Tahoe. The compromise to partition Tahoe with 2/3 to California and 1/3 to Nevada was reached when California became a state. Putting the state line right through the middle of the lake and then at 39 degrees north latitude, the stateline obliques southeasterly towards the Colorado River. Upon discovery of gold in the South Fork of the American River in 1848, thousands of west-bound gold seekers passed near the basin on their way to the gold fields. European civilization first made its mark in the Lake Tahoe basin with the 1858 discovery of the Comstock Lode, a silver deposit just 15 miles (24 km) to the east in Virginia City, Nevada. From 1858 until about 1890, logging in the basin supplied large timbers to shore up the underground workings of the Comstock mines. The logging was so extensive that almost all of the native forest was cut. In 1864, Tahoe City was founded as a resort community for Virginia City, the first recognition of the basin’s potential as a destination resort area. Public appreciation of the Tahoe basin grew, and during the 1912, 1913, and 1918 Congressional sessions, unsuccessful efforts were made to designate the basin as a national park. During the first half of the 20th century, development around the lake consisted of a few vacation homes. The post-World War II population and building boom, followed by construction of gambling casinos in the Nevada part of the basin during the mid-1950s, and completion of the interstate highway links for the 1960 Squaw Valley Olympics, resulted in a dramatic increase in development within the basin. From 1960 to 1980, the permanent resident population increased from about 10,000 to greater than 50,000, and the summer population grew from about 10,000 to about 90,000. Since the 1980s, development has slowed somewhat due to land use controls. Limnology and water quality In spite of land-use planning and export of treated sewage effluent from the basin, the lake is becoming increasingly eutrophic (richer in nutrients), with primary productivity increasing by more than 5% annually, and clarity decreasing at an average rate of 0.25 meters per year. Fine sediment, much of it resulting from land disturbance in the basin, accounts for about half of the loss in clarity. Until the early 1980s, nutrient limitation studies showed that primary productivity in the lake was nitrogen-limited. Now, after a half-century of accelerated nitrogen input (much of it from direct atmospheric deposition), the lake is phosphorus-limited. Because the volume of the lake is so large (156 km³) and its hydraulic residence time so long (about 650 years), its eutrophication may be essentially irreversible. Lake Tahoe never freezes. Since 1970, it has mixed to a depth of at least 400 m a total of 6 or 7 times. Dissolved oxygen is relatively high from top to bottom. Analysis of the temperature records in Lake Tahoe has shown that the lake warmed (between 1969 and 2002) at an average rate of 0.015 degrees C per year. The warming is caused primarily by increasing air temperatures, and secondarily by increasing downward long-wave radiation. Both of these factors are associated with global warming. The warming trend is reducing the frequency of deep mixing in the lake, and may have important effects on water clarity and nutrient cycling. Since the 1960s, the Lake’s food web and zooplankton populations have undergone major changes. In 1963-65, opossum shrimp (Mysis relicta) were introduced to enhance the food supply for the introduced kokanee salmon (Onchorhynchus nerka). The shrimp began feeding on the Lake’s cladocerans (Daphnia and Bosmina), and their populations virtually disappeared by 1971. The shrimp provide a food resource for salmon and trout, but also compete with juvenile fish for zooplankton. Since the 1970s, the cladoceran populations have somewhat recovered, but not to former levels. Lake Tahoe is actually a tributary watershed drainage element within the Truckee River Basin, and its sole outlet is the Truckee River, which continues on to discharge to Pyramid Lake. Because of the sensitivity of Truckee River water quality (involving two protected species, the cui-ui sucker fish and the Lahontan cutthroat trout), this drainage basin has been studied extensively. The primary investigations were stimulated by the U.S. Environmental Protection Agency, who funded the development of the DSSAM model to analyze water quality below Lake Tahoe. Environmental protection Lake Tahoe has suffered from much use. Until recently construction on the banks of the Lake had been, more or less, under the control of wealthy real estate developers. Construction activities had been linked to a 'clouding' of the amazingly blue waters of the Lake. Currently, the Tahoe Regional Planning Agency is regulating construction along the shoreline (and has won two Federal Supreme Court battles over recent decisions). Many residents are enraged by the laws that they have passed, especially those in the Tahoe Lakefront Homeowners Association. Since 1980, the Lake Tahoe Interagency Monitoring Program (LTIMP) has been measuring stream discharge and concentrations of nutrients and sediment in up to 10 tributary streams in the Lake Tahoe Basin, California-Nevada. The objectives of the LTIMP are to acquire and disseminate the water quality information necessary to support science-based environmental planning and decision making in the basin. The LTIMP is a cooperative program with support from 12 federal and state agencies with interests in the Tahoe Basin. This data set, together with more recently acquired data on urban runoff water quality, is being used by the Lahontan Regional Water Quality Control Board to develop a program (mandated by the Clean Water Act) to limit the flux of nutrients and fine sediment to the Lake. Tourist activities Much of the area surrounding Lake Tahoe is devoted to the tourism industry and there are many restaurants, ski slopes and casinos catering to visitors. Winter sports
Water sports
Hiking and mountain biking There are hundreds of hiking/mountain biking trails all around the lake. They range in size, length, difficulty, and popularity. One of the most famous of Tahoe's trails is the Tahoe Rim Trail, a 165 mile trail that circumnavigates the lake. Directly to the west of the lake is the Desolation Wilderness which provides great hiking and wilderness camping. One of the most popular trailheads is the Eagle Lake Trailhead. Gambling As gambling is legal in Nevada, the town of Stateline is home to four casino resorts and two smaller casinos. Miscellaneous facts
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