Question: How long is the river that contains Colter Falls?

full_context: Document 1: Yellowstone River: The Yellowstone River is a tributary of the Missouri River, approximately 692 mi long, in the western United States. Considered the principal tributary of the upper Missouri, the river and its tributaries drain a wide area stretching from the Rocky Mountains in the vicinity of the Yellowstone National Park across the mountains and high plains of southern Montana and northern Wyoming.
Document 2: Missouri River Valley: The Missouri River Valley outlines the journey of the Missouri River from its headwaters where the Madison, Jefferson and Gallatin Rivers flow together in Montana to its confluence with the Mississippi River in the State of Missouri. At 2300 mi long the valley drains one-sixth of the United States, and is the longest river valley on the North American continent. The valley in the Missouri River basin includes river bottoms and floodplains.
Document 3: Fish Creek Falls: Fish Creek Falls is a waterfall located about 5 miles to the east of Steamboat Springs, Colorado in Routt National Forest. Fish Creek runs from several small lakes in the Rabbit Ears Range of Colorado. In the summertime, the road to Fish Creek Falls becomes often clogged in mid-afternoon with tourists wanting to see the 283 ft waterfall. It is possible to hike all the way to the terminus of the waterfall through giant boulders and rushing water. There are two hiking trails from the parking lot at the end of Fish Creek Fall Road. One is 1/4 of a mile (1/4 mi ) and goes through several Aspen groves with the occasional Subalpine Fir. It ends at a viewing station where the entirety of the falls can be seen. The other trail goes straight down into the U-Shaped valley formed by glaciers. As it nears the bottom of the valley, one can hear the rushing sound of water over the fall and see beautiful Fish Creek. The trail continues on to Upper Fish Creek Falls and then on to the Wyoming Trail, a long trail running the northwestern mountains of Colorado to Wyoming. The falls provide a great place for ice climbing in the winter when 300+ inches of snow (300 in ) fall on the mountains east of Steamboat Springs.
Document 4: Missouri River: The Missouri River is the longest river in North America. Rising in the Rocky Mountains of western Montana, the Missouri flows east and south for 2341 mi before entering the Mississippi River north of St. Louis, Missouri. The river takes drainage from a sparsely populated, semi-arid watershed of more than half a million square miles (1,300,000 km), which includes parts of ten U.S. states and two Canadian provinces. When combined with the lower Mississippi River, it forms the world's fourth longest river system.
Document 5: Black Eagle Dam: Black Eagle Dam is a hydroelectric gravity weir dam located on the Missouri River in the city of Great Falls, Montana. The first dam on the site, built and opened in 1890, was a timber-and-rock crib dam. This structure was the first hydroelectric dam built in Montana and the first built on the Missouri River. The dam helped give the city of Great Falls the nickname "The Electric City." A second dam, built of concrete in 1926 and opened in 1927, replaced the first dam, which was not removed and lies submerged in the reservoir. Almost unchanged since 1926, the dam is 782 ft long and 34.5 ft high, and its powerhouse contains three turbines capable of generating seven megawatts (MW) of power each. The maximum power output of the dam is 18 MW. Montana Power Company built the second dam, PPL Corporation purchased it in 1997 and sold it to NorthWestern Corporation in 2014. The reservoir behind the dam has no official name, but was called the Long Pool for many years. The reservoir is about 2 mi long, and has a storage capacity of 1,710 acre.ft to 1,820 acre.ft of water.
Document 6: Great Falls (Catawba River): The Great Falls of the Catawba River mark the point at which the river encounters a series of rapids while coursing across the Piedmont Plateau on the border of Lancaster County, South Carolina, and Chester County, South Carolina, near the town of Great Falls. Prior to the creation of the Fishing Creek Reservoir and other artificial lakes by Duke Power, the falls were a major landmark on the river. The rapids could be heard from long distances away, while a major pre-Columbian trading path ran near the left bank. Historically the Great Falls of the Catawba were approximately 4 miles long, with a total elevation drop of 121 feet. (The word "falls" was an 18th-century appellation, when any river rapids and vertical waterfalls alike were both referred to as falls.) The creation of the dams at Great Falls, South Carolina has resulted in the top 2 miles of it being completely dry (dewatered) except during times of very high flow. The bottom portion of historical Great Falls is drowned by Cedar Creek dam, another hydroelectric project. As of 2006, interest groups have formed in the Carolinas to restore the Great Falls by altering the dam and restoring flow to the dewatered stretch of Great Falls as part of a major restoration project of the Catawba River. As of 2007, a new licensing arrangement has been agreed to by Duke Energy and several interested parties.
Document 7: Colter Falls: Colter Falls, also Coulter Falls, (4.3m) waterfall, nearly 0.5 mi in width, part of the Great Falls of the Missouri, on the Missouri River in north-central Montana. Downstream of Colter Falls lies Rainbow Falls, and upstream is Black Eagle Falls. The Lewis and Clark Expedition was known to discover Westslope cutthroat trout at the base of the falls. The falls is now flooded in the impoundment behind Rainbow Dam. As Rainbow Dam's reservoir is a run-of-the-river reservoir, it rarely is emptied, so the falls is rarely seen even in extreme drought. The falls was named by Paris Gibson, founder of the city of Great Falls, Montana, while they were not named by Lewis and Clark, who measured it at "6 feet 7 inches".
Document 8: Red Rock River (Montana): The Red Rock River is a roughly 70 mi river in southwestern Montana in the United States. Its drainage basin covers over 1548 mi2 . Its furthest tributary, Hell Roaring Creek, originates in the Beaverhead National Forest within a few hundred meters of the North American Continental Divide and Montana-Idaho border near Brower's Spring, at an elevation of about 9100 ft . Brower's Spring is near the furthest headwaters of the Missouri River, one of the major watercourses of the central United States. The drainage flows north and west with its name changing to "Red Rock Creek" into the Red Rock Lakes in the middle of a wide grassy valley; the Red Rock River issues from the west side of Lower Red Rock Lake. It flows west, receiving many tributaries such as Peet Creek and Long Creek, widening into the Lima Reservoir and then passing through a canyon, which ends near Lima, Montana. From there, it flows northwest through a valley, passing Kidd and Red Rock, and into Clark Canyon Reservoir. Under the waters of the lake was once the confluence of the Red Rock and Horse Prairie Creek, forming the Beaverhead River, a tributary of the Jefferson River, in turn a headwater of the Missouri River.
Document 9: Thompson Falls State Park: Thompson Falls State Park is a Montana state park located near Thompson Falls, Montana. Located on the banks of the Clark Fork River in western Montana, the park is 36 acres in size, and includes a campground, two boat launches, a kids' fishing pond, and riverside trail. The park is fully open April 1 to November 30; walk-in day use is permitted the rest of the year.
Document 10: Kautz Creek Falls: Kautz Creek Falls is a waterfall on Kautz Creek in the Mount Rainier National Park in the state of Washington. It was formed when the Kautz Glacier retreated in the last 50 years, creating a series of long and slender cascades totaling about 400 ft in height down a tall glacial cliff, with a highest drop of 150 ft . The falls consist of two parts, each with two distinct tiers. One of these parts flows from the upper lobe of the Kautz Glacier and disappears under the lower lobe. The water flowing over this stage is generally clear. As the water passes underneath the lower lobe, however; it has a muddy appearance caused by glacial moraine, which explains the muddy appearance of Kautz Creek.
Document 11: Mackenzie River: The Mackenzie River (Slavey language: Deh-Cho [tèh tʃʰò], "big river" or Inuvialuktun: Kuukpak [kuːkpɑk], "great river") is the largest and longest river system in Canada, and is exceeded only by the Mississippi River system in North America. It flows through a vast, isolated region of forest and tundra entirely within the country's Northwest Territories, although its many tributaries reach into four other Canadian provinces and territories. The river's mainstem runs 1738 km in a northerly direction to the Arctic Ocean, draining a vast area nearly the size of Indonesia. It is the largest river flowing into the Arctic from North America, and with its tributaries is one of the longest rivers in the world.
Document 12: Three Forks, Montana: Three Forks is a city in Gallatin County, Montana, United States and is located within the watershed valley system of both the Missouri and Mississippi rivers drainage basins — and is historically considered the birthplace or start of the Missouri River. The population was 1,869 at the 2010 census. The city of Three Forks is named so because it lies geographically near the point, in nearby Missouri Headwaters State Park, where the Jefferson, Madison, and Gallatin Rivers converge to form the Missouri River — the longest single river in North America, as well as the major portion of the Missouri-Mississippi River System from the headwaters near Three Forks to its discharge into the Gulf of Mexico. Three Forks is part of the Bozeman, MT Micropolitan Statistical Area of approximately 100,000 people and the greater Bozeman demographic area of approximately 125,000 people.
Document 13: Mississippi River: The Mississippi River is the chief river of the second-largest drainage system on the North American continent, second only to the Hudson Bay drainage system. Flowing entirely in the United States (although its drainage basin reaches into Canada), it rises in northern Minnesota and meanders slowly southwards for 2320 mi to the Mississippi River Delta at the Gulf of Mexico. With its many tributaries, the Mississippi's watershed drains all or parts of 31 U.S. states and 2 Canadian provinces between the Rocky and Appalachian Mountains. The Mississippi ranks as the fourth-longest and fifteenth-largest river in the world by discharge. The river either borders or passes through the states of Minnesota, Wisconsin, Iowa, Illinois, Missouri, Kentucky, Tennessee, Arkansas, Mississippi, and Louisiana.
Document 14: Rainbow Dam: Rainbow Dam is a hydroelectric dam on the Missouri River, 29 ft high and 1055 ft long, located six miles northeast of Great Falls in the U.S. state of Montana. The dam is named for the downstream Rainbow Falls, a 45 ft waterfall that is the third of the five Great Falls of the Missouri. Built in 1910, the dam furnishes water to an eight-unit hydroelectric plant with a capacity of 36 megawatts. As the dam's power plant is located over a half-mile downstream, the flow of water over Rainbow Falls and downstream Crooked Falls is significantly reduced during the dry season. The water from the penstocks re-enters the river a few hundred yards east of Crooked Falls. Montana Power Company acquired the dam when it was founded in 1912, PPL Corporation purchased it in 1997 and sold it to NorthWestern Corporation in 2014.
Document 15: Rainbow Falls (Missouri River): Rainbow Falls (originally "Handsome Falls") is a waterfall on the Missouri River in Great Falls, Montana, just upstream from Crooked Falls and downstream from Colter Falls and Rainbow Dam. It is 47 feet (14m) high and 1,320 feet (402.3m) wide. The waterfall is part of the five Great Falls of the Missouri. The river spills over a sheer ledge of sandstone in the Kootenai Formation, forming the falls. The falls used to flow with a great deal of force year-round. In 1914 the river shortly upstream was dammed for hydroelectric power by the Rainbow Dam, which forms a run-of-the-river reservoir. As a result, the falls can almost totally dry up in the summer with only a few narrow strips of water trickling down its face. A railroad bridge crosses the river directly above the falls.
ground_truth: 2341 mi