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The South Platte River is one of the two principal tributaries of the Platte River. Flowing through the U.S. states of Colorado and Nebraska, it is itself a major river of the American Midwest and the American Southwest/Mountain West. Its drainage basin includes much of the eastern flank of the Rocky Mountains in Colorado, much of the populated region known as the Colorado Front Range and Eastern Plains, and a portion of southeastern Wyoming in the vicinity of the city of Cheyenne. It joins the North Platte River in western Nebraska to form the Platte, which then flows across Nebraska to the Missouri. The river serves as the principal source of water for eastern Colorado. In its valley along the foothills in Colorado, it has permitted agriculture in an area of the Colorado Piedmont and Great Plains that is otherwise arid.

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South Platte River[1]
South Platte River in Douglas County, Colorado,
Native name	Wašíŋ Wakpá  (Lakota)
Physical characteristics
Source
• location	Confluence of South Fork and Middle Fork
• coordinates	39°00′40″N 105°44′25″W
Mouth
• location	Confluence with North Platte River
• coordinates	41°06′50″N 100°40′33″W
• elevation	2,762 ft (842 m)
Length	439 mi (707 km)[2]
Discharge
• average	174 cu ft/s (4.9 m3/s)
Basin features
Progression	Platte—Missouri—Mississippi
Discharge range	0 to 4,640 cu ft/s (0 to 131 m3/s)[3]

Description

The river is formed in Park County, Colorado, southwest of Denver in the South Park grassland basin by the confluence of the South Fork and Middle Fork, about 15 mi (24 km) southeast of Fairplay. Both forks rise along the eastern flank of the Mosquito Range, on the western side of South Park, which is drained by the tributaries at the headwaters of the river. From South Park, it passes through 50 mi (80 km) of the Platte Canyon and its lower section, Waterton Canyon. Here, it is joined by the North Fork before emerging from the foothills southwest of the Denver suburb of Littleton. At Littleton, the river is impounded to form Chatfield Reservoir, a flood-control basin for the Denver metropolitan area.

The river flows north through central Denver, which was founded along its banks at its confluence with Cherry Creek. The valley through Denver is highly industrialized, serving generally as the route for both the railroad lines, as well as Interstate 25. On the north side of Denver, it is joined somewhat inconspicuously by Clear Creek, which descends from the mountains to the west in a canyon that was the cradle of the Pike's Peak Gold Rush. North of Denver, it flows through the agricultural heartland of the Piedmont (a shale region that was formed through erosion by the ancestor of the river following the creation of the Rockies). It flows directly past the communities of Brighton and Fort Lupton, and is joined in succession by Saint Vrain Creek, the Little Thompson River, the Big Thompson River, and the Cache la Poudre River, which it receives just east of Greeley.

East of Greeley, it turns eastward, flowing across the Colorado Eastern Plains, past Fort Morgan and Brush, where it turns northeastward. It continues past Sterling, and runs into Nebraska between Julesburg, Colorado, and Big Springs, Nebraska. In Nebraska, it passes south of Ogallala and joins the North Platte River near the city of North Platte.

The South Platte River through Denver is on the U.S. Environmental Protection Agency's (US EPA) list of impaired waterbodies for pathogen impairment, with E. coli as the representative pathogen species. Other water issues involve the appearance of the New Zealand mud snail and zebra mussel.

History

The South Platte was originally called Niinéniiniicíihéhe by the native Arapaho people who lived on its banks. The early Spanish explorers called it the Rio Chato (calm river). In 1702, it was named the Rio Jesus Maria by Captain Jose Lopez, the Tewa Irish scout and captain of war of the New Mexico Indian Auxiliaries, who was ordered by the viceroy of New Spain to search the Tierra Incognita for a French incursion into New Mexico.[4] The South Platte also served as a vital water source in Colorado. Long before the city of Denver was created, many travelers came to the South Platte River to escape the arid Great Plains. These people could survive the heat, but not without the vital water source that the South Platte gave them. Buckets and wells sufficed as a water system for a while, but eventually, the Denver Water System was created.[5]

Dams

In an arid region of the United States, the South Platte is marked with several dams. The first notable water impoundment on the South Platte is Antero Reservoir. "Antero" is derived from the Spanish word "delantero", which means "foremost" or "head", as the reservoir was the first dam on the South Platte River near the river's origin.

The next dam is Spinney Mountain Reservoir. At capacity, Spinney Mountain covers 2,500 acres (10 km²). A bottom-release dam, Spinney releases to the east of the inlet.

Two miles below Spinney Mountain Reservoir, the river enters Eleven Mile Reservoir, with a capacity of 97,000 acre-feet (120,000,000 m³). The Eleven Mile Reservoir Dam drains into Eleven Mile Canyon, which runs through Forest Service land. Three former Colorado towns, Howbert, Idlewild, and Freshwater Station, were submerged under the reservoir when it was built.[6]

From Eleven Mile Canyon, the South Platte runs northeast to Cheesman Reservoir, named for Denver water pioneer Walter S. Cheesman. At its completion in 1905, the dam was the world's tallest, at 221 ft (67 m) above the streambed. The reservoir and related facilities were purchased in November 1918 by the Denver Water Board. Cheesman was the first reservoir of Denver's mountain storage facilities,, and has been designated a National Historic Civil Engineering Landmark. Cheesman Reservoir feeds Cheesman Canyon. Six miles below Cheesman Reservoir is the town of Deckers; there, the river bends north for about 17 mi (27 km) to the confluence with the North Fork of the South Platte.

In the late 1980s, a proposal was put forth for the Two Forks Dam, which would have created a reservoir flooding the entire section from the North Fork confluence to the town of Deckers. In 1990, the US EPA vetoed the permit, calling the project an "environmental catastrophe."

From the confluence, the river flows towards Denver and enters Strontia Springs Reservoir.

Below Strontia Springs, the South Platte runs through Waterton Canyon before entering Chatfield Reservoir. Chatfield marks the seventh and final dam on the South Platte until it merges with the North Platte.

Fly fishing overview

The South Platte River is a gold medal western trout river on the eastern slope of Colorado. The river is well known for its wild trophy population of brown and rainbow trout. As a result of its close proximity to Denver, the river has thousands of fly fishing enthusiasts visit each year. With seven dams on the river, the South Platte is considered a tailwater fishery. Most of these dams are bottom released, which allows for both stable water temperatures and year-round fly fishing. Popular fly-fishing stretches of the river include Waterton Canyon, Deckers, Cheesman Canyon and the Dream Stream.

See also

• List of rivers of Colorado
• List of rivers of Nebraska
• South Platte River Trail Scenic and Historic Byway, a 19-mile byway in Sedgwick County, Colorado
• South Platte Trail, the historic trail along the South Platte River, from northwestern Colorado to the Denver area

References

External links

• Antero Reservoir
• Chatfield Reservoir
• Cheesman Reservoir
• USGS: South Platte River Basin
• University of Colorado: GIS Hydro Data for the South Platte
• City of Denver: South Platte Initiative
• Eleven Mile Reservoir
• The Greenway Foundation
• Spinney Mountain Reservoir
• Strontia Springs Reservoir and Waterton Canyon

На других языках

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[de] South Platte River

Der South Platte River (auch South Platte) ist neben dem North Platte River einer der Quellflüsse des Platte River in den USA.

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- [en] South Platte River

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[es] Río Platte Sur

El río Platte Sur o río de Jesús María[2][3] (en inglés, South Platte River,[4] que significa 'río plano del Sur' (o meridional), según la palabra francesa «platte») es un río del Medio Oeste de los Estados Unidos, una de las dos fuentes del río Platte (a su vez afluente del río Misuri) que discurre por la vertiente oriental de las Montañas Rocosas y la parte central de las Grandes Llanuras. Tiene aproximadamente 707 km de longitud,[1] que lo sitúan entre los 60 ríos más largos de los Estados Unidos. Drena una cuenca de 62.738 km² (algo más pequeña que países como Lituania, Letonia o Sri Lanka), que corresponden a la mayor parte de la vertiente oriental de las Montañas Rocosas en Colorado y a una amplia región de la zona central de las Grandes Llanuras, en especial, de los Llanos Orientales de Colorado y del Sur de Nebraska. Con 48.948 km² de cuenca en Colorado, el río Platte Sur es el tercer colector de Colorado y es la principal fuente de abastecimiento de agua de la parte oriental del estado y para la agricultura en la árida región del Piedmont. Su cuenca también comprende una pequeña parte del estado de Wyoming, el extremo suroriental, la región de los alrededores de la ciudad de Cheyenne.

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[it] South Platte

Il South Platte è un fiume degli Stati Uniti dalla cui confluenza con il fiume North Platte ha origine il fiume Platte, affluente occidentale del Missouri. Nasce sulle Montagne Rocciose e scorre attraverso lo Stato del Colorado per una lunghezza di 628 km, prima di incontrare il North Platte poco oltre il confine con il territorio del Nebraska, nella città di North Platte.

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[ru] Саут-Платт (река)

Саут-Платт (англ. South Platte River) — река в штатах Колорадо и Небраска, США. Наряду с рекой Норт-Платт является одной из двух составляющих реки Платт, которая несёт свои воды в реку Миссури. Длина — 707 км[1].

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