paragraph_text: The Town of Cedaredge is a Home Rule Municipality in Delta County, Colorado, United States. The town population was 2253 at the 2010 United States Census. Cedaredge sits in the Surface Creek Valley beneath the southern slopes of the Grand Mesa, the largest mesa in the world. Its elevated vantage point affords southern views of the San Juan Mountains, the Black Canyon of the Gunnison National Park, and the communities of Delta, Olathe, and Montrose. Cedaredge is a small, agricultural community which produces beef cattle, apples, peaches, and wine from the region's few basic vineyards. Tourist attractions include Cedaredge Golf Club, Historic Pioneer Town, and an art gallery and craft store housed in a renovated apple packing shed. Regional sporting activities include camping, trophy hunting, hiking and Gold Medal fishing at more than 250 lakes on the Grand Mesa. During the winter locals partake in snowmobiling and Nordic skiing on the Mesa's trails. Powderhorn Resort is located north of Cedaredge and has ski terrain such as groomers, bumps, glades, and boulder fields, as well as two terrain parks.

paragraph_text: Copper Creek is a ghost town in Pinal County, Arizona, United States. Copper Creek is located in a canyon in the Galiuro Mountains.

paragraph_text: Mount Goddard is a mountain of California's Sierra Nevada, in the north section of Kings Canyon National Park. Goddard forms the southwest boundary of the Evolution Basin.

paragraph_text: The main mountain range in the state is the Sierra Madre Occidental reaching a maximum altitude of 10,826 ft (3,300 m) known as Cerro Mohinora. Mountains account for one third of the state's surface area which include large coniferous forests. The climate in the mountainous regions varies Chihuahua has more forests than any other state in Mexico making the area a bountiful source of wood; the mountainous areas are rich in minerals important to Mexico's mining industry. Precipitation and temperature in the mountainous areas depends on the elevation. Between the months of November and March snow storms are possible in the lower elevations and are frequent in the higher elevations. There are several watersheds located in the Sierra Madre Occidental all of the water that flows through the state; most of the rivers finally empty into the Río Grande. Temperatures in some canyons in the state reach over 100 °F in the summer while the same areas rarely drop below 32 °F in the winter. Microclimates found in the heart of the Sierra Madre Occidental in the state could be considered tropical, and wild tropical plants have been found in some canyons. La Barranca del Cobre, or Copper Canyon, a spectacular canyon system larger and deeper than the Grand Canyon; the canyon also contains Mexico's two tallest waterfalls: Basaseachic Falls and Piedra Volada. There are two national parks found in the mountainous area of the state: Cumbres de Majalca National Park and Basaseachic Falls National Park.

paragraph_text: The Grand Canyon North Rim Headquarters is a historic district on the North Rim of the Grand Canyon in Grand Canyon National Park, Arizona. Established from 1926 through the 1930s, the district includes examples of National Park Service Rustic architecture as applied to employee residences, administrative facilities and service structures.

paragraph_text: The Fish River (Visrivier in Afrikaans, Fischfluss in German) is a river in Namibia.  It is 650 km long, flowing from the Naukluft Mountains 150 km to the Hardap Dam near Mariental. From there the flow is entirely blocked, all further flow downstream coming from tributaries downstream from the dam.  The flow of the river is seasonal; in winter the river can dry up completely.  Despite this, the river is the site of the spectacular Fish River Canyon, a canyon 160 km long, and at points as much as 550 m deep.

paragraph_text: Canyon Creek is a hamlet in northern Alberta, Canada within the Municipal District of Lesser Slave River No. 124. It is located on Highway 2, approximately east of Grande Prairie.

paragraph_text: Grand Canyon National Park, located in northwestern Arizona, is the 15th site in the United States to have been named a national park. The park's central feature is the Grand Canyon, a gorge of the Colorado River, which is often considered one of the Wonders of the World. The park, which covers 1,217,262 acres (1,901.972 sq mi; 4,926.08 km) of unincorporated area in Coconino and Mohave counties, received more than six million recreational visitors in 2017, which is the second highest count of all American national parks after Great Smoky Mountains National Park. The Grand Canyon was designated a World Heritage Site by UNESCO in 1979.

paragraph_text: Nearly two billion years of Earth's geological history have been exposed as the Colorado River and its tributaries cut their channels through layer after layer of rock while the Colorado Plateau was uplifted. While some aspects about the history of incision of the canyon are debated by geologists, several recent studies support the hypothesis that the Colorado River established its course through the area about 5 to 6 million years ago. Since that time, the Colorado River has driven the down - cutting of the tributaries and retreat of the cliffs, simultaneously deepening and widening the canyon.

paragraph_text: SS "Grand Canyon State" (T-ACS-3) is a crane ship in ready reserve for the United States Navy. The ship was named for the state of Arizona, which is also known as the "Grand Canyon State".

paragraph_text: Shadow Mountain Dam is a zoned earth-fill dam on the Colorado River in Grand County, Colorado. Constructed between 1944 and 1946, the Shadow Mountain Dam creates the Shadow Mountain Lake, with a structural height of and a drainage area of . Shadow Mountain Lake is a holding reservoir for water pumped up from Lake Granby just to the south through the Granby Pumping Plant and Canal. Shadow Mountain Lake is connected by a short channel to the natural Grand Lake. The west portal of the Alva B. Adams Tunnel is located on Grand Lake. The Adams Tunnel diverts west slope water to the east slope of the Rocky Mountains for use in agriculture and to serve the populated areas of Colorado, including Denver.

paragraph_text: Candor Chasma is one of the largest canyons in the Valles Marineris canyon system on Mars. The feature is geographically divided into two halves: East and West Candor Chasmas, respectively. It is unclear how the canyon originally formed; one theory is that it was expanded and deepened by tectonic processes similar to a graben, while another suggests that it was formed by subsurface water erosion similar to a karst. MRO discovered sulfates, hydrated sulfates, and iron oxides in Candor Chasma.

paragraph_text: Byers Canyon is a short gorge on the upper Colorado River in Grand County, Colorado in the United States. The canyon is approximately 8 miles (13 km) long and is located in the headwaters region of the Colorado between Hot Sulphur Springs and Kremmling. U.S. Highway 40 passes through the canyon between Hot Sulphur Springs and Kremmling. The Union Pacific Railroad's Moffat Route also travels through the short canyon.

paragraph_text: Hopi House is located on the South Rim of the Grand Canyon, within Grand Canyon National Park in the U.S. state of Arizona. Built in 1904 as concessioner facilities at the South Rim were being developed, it is the first of eight projects at the Grand Canyon that were designed by architect Mary Colter, along with Bright Angel Lodge, Hermit's Rest, Lookout Studio, Phantom Ranch, Desert View Watchtower, Colter Hall and Victor Hall, (the latter two being employee dormitories). Hopi House was built by the Fred Harvey Company as a market for Native American crafts, made by artisans on the site. The Hopi, as the historic inhabitants of the area, were chosen as the featured artisans, and the building was designed to closely resemble a traditional Hopi pueblo. Hopi House opened on January 1, 1905, two weeks before the El Tovar Hotel, located just to the west, was opened.

paragraph_text: Molteno Dam is a small but historic dam, on the lower slopes of Table Mountain in Western Cape, South Africa. Still in service, it was established in 1877 and is now located in the suburb of Oranjezicht, Cape Town.

paragraph_text: Although Chihuahua is primarily identified with the Chihuahuan Desert for namesake, it has more forests than any other state in Mexico, with the exception of Durango. Due to its variant climate, the state has a large variety of fauna and flora. The state is mostly characterized by rugged mountainous terrain and wide river valleys. The Sierra Madre Occidental mountain range, an extension of the Rocky Mountains, dominates the state's terrain and is home to the state's greatest attraction, Las Barrancas del Cobre, or Copper Canyon, a canyon system larger and deeper than the Grand Canyon. On the slope of the Sierra Madre Occidental mountains (around the regions of Casas Grandes, Cuauhtémoc and Parral), there are vast prairies of short yellow grass, the source of the bulk of the state's agricultural production. Most of the inhabitants live along the Rio Grande Valley and the Conchos River Valley.

paragraph_text: The Royal Society Range () is a majestic mountain range in Victoria Land, Antarctica. With its summit at , the massive Mount Lister forms the highest point in this range. Mount Lister is located along the western shore of McMurdo Sound between the Koettlitz, Skelton and Ferrar glaciers. Other notable local terrain features include Allison Glacier, which descends from the west slopes of the Royal Society Range into Skelton Glacier.

paragraph_text: Glacier View Dam was proposed in 1943 on the North Fork of the Flathead River, on the western border of Glacier National Park in Montana. The tall dam, to be designed and constructed by the U.S. Army Corps of Engineers in the canyon between Huckleberry Mountain and Glacier View Mountain, would have flooded in excess of of the park. In the face of determined opposition from the National Park Service and conservation groups, the dam was never built.

paragraph_text: Klinaklini Canyon is a canyon on the Klinaklini River in the Pacific Ranges of the Coast Mountains in British Columbia, Canada, located to the north of the head of Knight Inlet in the river's lowermost reaches, upstream from the confluence of the West Klinaklini River.

paragraph_text: Inniscarra Dam is a buttress dam located on the River Lee in County Cork, Ireland. Construction of the dam started in February 1953. It is owned and operated by the ESB Group. It has a generation capacity of 19 MW.

Question: When did the body of water containing Shadow Mountain Dam start to form the grand canyon?
Answer: about 5 to 6 million years ago