Instruct: Given a question, retrieve relevant documents that answer the question.
Query: What is the tallest waterfall in Yellowstone National Park?
Yellowstone National Park contains at least 45 named waterfalls and cascades, and hundreds more unnamed, even undiscovered waterfalls over 15 feet (4.6m) high. The highest plunge type waterfall in the park is the lower Falls of Yellowstone Falls at 308 feet (94m). The highest horsetail type is Silver Cord Cascade at 1,200 feet (370m).
Yellowstone was part of a federally governed territory. With no state government that could assume stewardship of the land, the federal government took on direct responsibility for the park, the official first national park of the United States. The combined effort and interest of conservationists, politicians and the Northern Pacific Railroad ensured the passage of enabling legislation by the United States Congress to create Yellowstone National Park. Theodore Roosevelt and his group of conservationists, the Boone and Crockett Club, were already an active campaigners, and so influential, as good stump speakers were highly necessary in the pre-telecommunications era, was highly influential in convincing fellow Republicans and big business to back the bill. Yellowstone National Park soon played a pivotal role in the conservation of these national treasures, as it was suffering at the hands of poachers and others who stood at the ready to pillage what they could from the area. Theodore Roosevelt and his newly formed Boone and Crockett Club successfully took the lead in protecting Yellowstone National Park from this plight, resulting in laws designed to conserve the natural resources in Yellowstone and other parks under the Government's purview.
The fish of Yellowstone National Park, in Idaho, Montana and Wyoming (U.S.), include 13 native fish species and six introduced or non-native species. Angling for trout has been a pastime in the park since its creation and trout species dominate the fish inhabiting the park. When Yellowstone National Park was created in 1872, 40% of the park's waters were barren of fish, including most alpine lakes and rivers above major waterfalls. Only 17 of 150 lakes held fish.
The Mottled sculpin "(Cottus bairdi)" is widely distributed in Yellowstone streams and rivers below the major falls. It occurs in the Fall River, Snake River, Shoshone River, Yellowstone River and Gallatin River drainages. With one exception, it occurs only below the major waterfall barriers on the Firehole (Firehole Falls), Yellowstone (Knowles Falls) and Fall river drainages. When the park waters were first surveyed in the 1880s–90s by biologists, they discovered a population of Mottled scuplin in the Gibbon River above Gibbon Falls, a water otherwise barren of fish. No scientific explanation for this has yet been developed.
Khun Nan National Park is part of the Luang Prabang montane rain forests ecoregion. Sapan Waterfall, located near the Lao border, is the most important waterfall in the park; Huai Ha waterfall has water throughout the year. Other waterfalls within the perimeter of the park are Huai Ti and Ban Den. 1,745 m high Doi Phi Pan Nam is the tallest peak within the park. The Wa River has its sources in the mountains of the park and flows through it.
The original expeditions that explored the regions that ultimately became Yellowstone National Park in 1872 caught fish in many of its waters to supply themselves with fresh provisions. It wasn't long after the creation of the park, that park officials understood the importance of angling to visitors and the importance of creating a ready resource to supply hotels and camps within the park with fresh fish. This resulted in the first government stocking of native and non-native species in 1889 and continued with a variety of successful and unsuccessful stocking efforts until 1955 when all stocking programs in the park were discontinued. Today's park trout are completely wild populations. Many of the park's waters held no fish prior to government stocking operations which introduced mainly non-native species to the rivers and lakes and redistributed native species. In fact, with the exception of the upper Yellowstone River drainage, all the lakes and streams above major waterfalls were devoid of game fish prior to government stocking operations.
Bechler Falls ht. is a waterfall on the Bechler River in Yellowstone National Park. Bechler Falls is the last waterfall on the Bechler River and is approximately from the confluence with the Fall River. It can be reached via the Bechler River trail approximately from the Cave Falls trailhead at the south boundary of the park. The falls were named in 1921 by explorers E. C. Gregg and C.H. Birdseye.
The Heritage and Research Center is located at Gardiner, Montana, near the north entrance to the park. The center is home to the Yellowstone National Park's museum collection, archives, research library, historian, archeology lab, and herbarium. The Yellowstone National Park Archives maintain collections of historical records of Yellowstone and the National Park Service. The collection includes the administrative records of Yellowstone, as well as resource management records, records from major projects, and donated manuscripts and personal papers. The archives are affiliated with the National Archives and Records Administration.
In the U.S., the most well-known place for travertine formation is Yellowstone National Park, where the geothermal areas are rich in travertine deposits. Wyoming also has travertines in Hot Springs State Park in Thermopolis. Oklahoma has two parks dedicated to this natural wonder. Turner Falls, the tallest waterfall in Oklahoma, is a cascade of spring water flowing over a travertine cave. Honey Creek feeds this waterfall and creates miles of travertine shelves both up and downstream. Many small waterfalls upstream in the dense woods repeat the travertine-formation effect. The city of Davis now owns thousands of acres of this land and has made it a tourist attraction. Another travertine resource is in Sulphur, Oklahoma, east of Turner Falls. Travertine Creek flows through a spring-water nature preserve within the boundaries of the Chickasaw National Recreation Area.
The natural areas include forests, rolling hills, narrow ravines, wetlands, rivers, and waterfalls. About 100 waterfalls are located in the Cuyahoga Valley, with the most popular being the tall Brandywine Falls—the tallest waterfall in the park and the tallest in Northeast Ohio. The Ledges are a rock outcropping that provides a westward view across the valley's wooded areas. Talus caves are located among the boulders in the forest around the Ledges.
In 1848, during the American occupation of Mexico after the Mexican–American War, Raynolds and other U.S. Army personnel were the first confirmed to have reached the summit Pico de Orizaba, the tallest mountain in Mexico, and inadvertently set what may have been a 50-year American alpine altitude record. In 1859, Raynolds was placed in charge of the first government-sponsored expedition to venture into the upper Yellowstone region that was later to become Yellowstone National Park. Heavy winter snowpack in the Absaroka Range of Wyoming prevented the expedition from reaching the Yellowstone Plateau, forcing them to divert to the south and cross Union Pass at the northern end of the Wind River Range. After negotiating the pass the expedition entered Jackson Hole and surveyed the Teton Range, now within Grand Teton National Park.
Tugela Falls is a complex of seasonal waterfalls located in the Drakensberg ("Dragon's Mountains") of Royal Natal National Park in KwaZulu-Natal Province, Republic of South Africa. It is generally accepted as the world's second-tallest waterfall but there is an argument that it is actually the tallest waterfall in the world, rather than Venezuela's Angel Falls.
In 1936 and 1937, a British businessman and fly fisherman who emigrated to New York in 1930 by the name of Howard Back visited the park and compiled the first real assessment of the various waters and what the fly fisherman could expect from them. In his "The Waters of the Yellowstone with Rod and Fly (1938)", Back described his fishing experiences on what he called the Four Rivers which include the Madison, Firehole and Gibbon rivers, as well as the Yellowstone River. Prior to Back's work, the only available serious reference for anglers was a 1921 Bureau of Fisheries publication entitled "The Fishes of the Yellowstone National Park—With Description of Park Waters and Notes on Fishing", a publication that Back encouraged all prospective anglers visiting Yellowstone to read,
In 1938, at the same time Back was publishing his work, Dan Bailey, another eastern angler was opening Dan Bailey's fly shop in Livingston, Montana north of the Gardiner park entrance. Although Dan Bailey guided and serviced fly fisherman throughout South Central Montana, much of his business was guiding and outfitting fishermen in Yellowstone National Park. Dan Bailey's Fly Shop is still in business today servicing anglers visiting Yellowstone.
Yellowstone National Park has one of the world's largest petrified forests, trees which were long ago buried by ash and soil and transformed from wood to mineral materials. This ash and other volcanic debris are believed to have come from the park area itself as the central part of Yellowstone is the massive caldera of a supervolcano. The park contains 290 waterfalls of at least , the highest being the Lower Falls of the Yellowstone River at .
Yellowstone Falls consist of two major waterfalls on the Yellowstone River, within Yellowstone National Park, Wyoming, United States. As the Yellowstone river flows north from Yellowstone Lake, it leaves the Hayden Valley and plunges first over Upper Yellowstone Falls and then a quarter mile (400 m) downstream over Lower Yellowstone Falls, at which point it then enters the Grand Canyon of the Yellowstone, which is up to 1,000 feet (304 m) deep.
The Mountain sucker "(Catostomus platyrhynchus)" is widely distributed in rivers and streams of Yellowstone's major drainages below the major waterfalls.
Union Falls ht. is a waterfall on Mountain Ash Creek, a tributary of the Fall River in the "Cascade Corner" (southwest) of Yellowstone National Park. It is the second highest waterfall in Yellowstone exceeded in height only by the lower Yellowstone Falls. The falls got its name from members of the Arnold Hague Geological Surveys sometime between 1884-86. Geologist J.P. Iddings claims the name derives from the fact that a tributary of Mountain Ash Creek joins at the very brink of the falls, thus "Union Falls". Access to the falls is via the Mountain Ash Creek trail and the Grassy Lake Road.
Moose Falls (height ) is a plunge type waterfall on Crawfish Creek in Yellowstone National Park. The waterfall was named in 1885 by members of the Arnold Hague Geologic Survey for the plentiful moose found in the southern sections of the park. The falls are just west of south entrance road via an easy trail that begins north of the south entrance station.
Starting in the 1940s, park managers, biologists, conservationists and environmentalists began what would ultimately turn into a campaign to reintroduce the gray wolf into Yellowstone National Park. When the Endangered Species Act of 1973 was passed, the road to legal reintroduction was clear. In 1995, gray wolves were first reintroduced into Yellowstone in the Lamar Valley. The history of wolves in Yellowstone chronicles the extirpation, absence and reintroduction of gray wolves to Yellowstone, and how the reintroduction was not without controversy or surprises for scientists, governments or park managers.
Silver Cord Cascade is a horsetail type waterfall on Surface Creek, a tributary of the Yellowstone River in Yellowstone National Park. Surface Creek flows out of Ribbon Lake off the South rim of the Grand Canyon of the Yellowstone and plunges to the Yellowstone River. It is considered the tallest waterfall in Yellowstone.
Terraced Falls ht. is a waterfall on Fall River in Yellowstone National Park. 
The highest waterfall on Fall River, Terraced Falls was probably named by the Hague Geological Survey in 1885-1886. An attempt was made to rename it "Totem Falls" in the 1920s, but the USBGN kept the original name. Terraced Falls is easily accessed via a short trail from the Ashton-Flagg Ranch Road along Yellowstone National Park's south border.
Crecelius Cascade, 75 feet (23m), Eleanor Lake
While working as a bell hop at the Old Faithful Inn during the summer of 1949, Princeton Seminary student, Warren W. Ost, was asked by the Superintendent's Church Committee of Yellowstone to contribute his insight on how a student ministry could be further developed in Yellowstone National Park. As a result, Ost returned to Yellowstone in 1950 with fellow seminarian, Donald Bower, to lead interdenominational Sunday worship services in several areas of the park, thus expanding the idea of student-led national park ministry and laying the foundation for what would soon become "A Protestant Ministry in the National Parks."
Phu Fa is a waterfall in the deep jungle of the Luang Prabang Range near the Laos border. It is located in the protected area of Doi Phu Kha National Park, Mae Charim District. Phu Fa waterfall is the biggest and the tallest waterfall in Nan Province. 
Njupeskär is a waterfall in the river Njupån in Fulufjället National Park, Sweden. With a total height of about 93 meters, it is officially the highest waterfall in Sweden. Newer sources provide that the total height of waterfall is 125 m and the tallest plunge is 95 m high. 
Njupeskär falls over the rim of eroded sandstone plateau of Fulufjället, waterfall has formed an impressive canyon. A few days per year, in early morning around midsummer, the sun shines on the waterfall .