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The Big Thompson River

The headwaters of the Big Thompson River are in Rocky Mountain National Park.

The Big Thompson River is a tributary of the South Platte, approximately 78 miles (123 km) long, in the U.S. state of Colorado. Big Thompson River © 2004 Matthew Trump File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Big Thompson River © 2004 Matthew Trump File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Description: Moraine Park and the headwaters of the Big Thompson River in Rocky Mountain National Park. ... Description: Moraine Park and the headwaters of the Big Thompson River in Rocky Mountain National Park. ... This article belongs in one or more categories. ... The South Platte River in Denver, Colorado The South Platte River is one of the two principal tributaries of the Platte River and itself a major river of the American West, located in the U.S. states of Colorado and Nebraska. ... Federal courts Supreme Court Chief Justice Associate Justices Elections Presidential elections Midterm elections Political Parties Democratic Republican Minor parties State & Local government Governors Legislatures State Courts Counties, Cities, and Towns Other countries â€¢ Politics Portal • • A state of the United States is any one of the fifty subnational entities referred to... Official language(s) English Capital Denver Largest city Denver Area  Ranked 8th  - Total 104,185 sq mi (269,837 km²)  - Width 280 miles (451 km)  - Length 380 miles (612 km)  - % water 0. ...

It rises in the Front Range of the Rocky Mountains, in Larimer County, Colorado, in Rocky Mountain National Park on the eastern slope of Longs Peak, near the town of Estes Park. It descends 1/2 mile (800 m) in elevation through the mountains in the spectacular 25 mi. (40 km) Big Thompson Canyon, emerging from the foothills west of Loveland. The Front Range is shown highlighted on a map of the western United States The Front Range is a mountain range in the United States on the eastern edge of the Rocky Mountains, and on the western edge of the Great Plains. ... Moraine Lake, and the Valley of the Ten Peaks, Banff National Park, British Columbia, Canada The Rocky Mountains, often called the Rockies, are a broad mountain range in western North America. ... Larimer County is a county located in the U.S. state of Colorado. ... Rocky Mountain National Park is located in the north central region of the U.S. state of Colorado. ... Longs Peak (or Longs Peak, see below) is one of the 54 fourteeners in the Rocky Mountains of Colorado. ... Estes Park is a town located in Larimer County, Colorado on the Big Thompson River. ... Loveland is a city in Larimer County, Colorado (USA). ...

It flows eastward south of Loveland across the plains into Weld County and joins the South Platte approximately 5 mi (8 km) south of Greeley. It receives the Little Thompson River approximately 4 mi (6 km) upstream from its mouth. The Great Plains is the broad expanse of prairie which lies east of the Rocky Mountains in the United States and Canada. ... Weld County is a county located in the U.S. state of Colorado. ... Greeley is a city in Weld County, Colorado, United States. ...

Water resources in the Big Thompson River are managed by the Northern Colorado Water Conservancy District as part of the Colorado-Big Thompson Project. The Colorado Big Thompson Project is a very large water diversion project in Colorado designed to collect Western Slope mountain water, principally from the Colorado River, and divert approximately 260,000 acre-feet to the Front Range, via the Alva B. Adams tunnel beneath the Continental Divide. ...

Big Thompson Canyon Flooding of 1976

On July 31, 1976, during the celebration of Colorado's centennial, the Big Thompson Canyon was the site of devastating flash floods that swept down the steep and narrow canyon, claiming the lives of 145 people, 6 of whom were never found. This flood was triggered by a nearly stationary thunderstorm near the upper section of the canyon that dumped 30 centimeters (12 inches) of rain in less than 4 hours (more than 3/4 of the annual rainfall for the area). Little rain fell over the lower section of the canyon, where many of the victims were. Around 9PM a wall of water more than 6 meters (20 ft) deep raced down the canyon at about 6 m/s (14 mph), destroying 400 cars, 418 houses and 52 businesses and washing out most of U.S. Route 34. July 31 is the 212th day (213th in leap years) of the year in the Gregorian Calendar, with 153 days remaining. ... 1976 (MCMLXXVI) was a leap year starting on Thursday. ... Lower Antelope Canyon was carved out of sandstone over millions of years by flash floods A flash flood is a rapid flooding of low-lying areas, rivers and streams, that is caused by the intense rainfall associated with a thunderstorm, or multiple training thunderstorms. ... A shelf cloud associated with a heavy or severe thunderstorm over Enschede, The Netherlands. ... This U.S. Highway article needs to be cleaned up to conform to both a higher standard of article quality and accepted design standards outlined in the WikiProject U.S. Highways. ...

This flood was more than 4 times as strong as any in the 112-year record available in 1976, with a discharge of 1,000 cubic meters per second (30,000 ft³/s). However, paleoflood data obtained from radiocarbon dating of sediments indicates that such flooding occurs in the area every few thousand years. Radiocarbon dating is a radiometric dating method that uses the naturally occurring isotope carbon-14 to determine the age of carbonaceous materials up to ca 60,000 years. ...

Sources

D. Hyndman and D. Hyndman, Natural Hazards and Disasters (Thomson Brooks/Cole, 2006), 270-271.

See also

• List of Colorado rivers

This is a partial list of rivers in the state of Colorado in the United States. ...

External links

• I Dream of Genealogy Memorial for Big Thompson Canyon Flood Victims of 1976
• NOAA Site on the Big Thompson Canyon Floods
• Univ. of Colorado-Colorado Springs: The Big Thompson Canyon Floods: 20 Years Later
• Colorado State University: Big Thompson Watershed
• Northern Colorado Water Conservancy District
• Larimer County website: History of the flood

Colorado Big Thompson Project The Colorado Big Thompson Project is a very large water diversion project in Colorado to collect Western Slope mountain water (principally the Big Thompson River) and divert approximately 250,000 acre-feet, via an underground tunnel beneath the Continental Divide, over to the Front Range counties of Boulder, Larimer and...