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Animas River
Animas River DSRR.jpg
Animas River at Durango and Silverton railroad crossing just north of confluence with Lime Creek
Animas River is located in New Mexico
Animas River
Location of the mouth of the Animas River in New Mexico
Country United States
State Colorado, New Mexico
Physical characteristics
Main source Confluence of North Fork Animas River and West Fork Animas River
37°55′53″N 107°34′10″W / 37.93139°N 107.56944°W / 37.93139; -107.56944
San Juan County, CO
37°55′53″N 107°34′10″W / 37.93139°N 107.56944°W / 37.93139; -107.56944
River mouth Confluence with San Juan
San Juan County, NM
5,239 ft (1,597 m)
36°42′50″N 108°13′18″W / 36.71389°N 108.22167°W / 36.71389; -108.22167
Length 126 mi (203 km)
Basin features
  • Left:
    Cunningham Creek, Elk Creek, Needle Creek, Canyon Creek, Florida River
  • Right:
    Mineral Creek, Mineral Creek, Lime Creek, Hermosa Creek, Junction Creek, Lightner Creek

Animas River (On-e-mas) (Río de las Ánimas, in Spanish) is a 126-mile-long (203 km) river in the western United States, a tributary of the San Juan River, part of the Colorado River System.

The Animas-La Plata Water Project was completed in 2015. The project pumps water over a low pass to fill a reservoir, Lake Nighthorse, in Ridges Basin to satisfy Southern Ute tribal water rights claims associated with the Colorado Ute Settlement Act amendments of 2000.


Animas River just north of downtown Durango, CO
The river just north of downtown Durango

Spanish explorer Juan Maria de Rivera of Santa Fe recorded the name "Rio de las Animas" (in English, River of Souls) in 1765. One theory is that the full name of the river was once "Rio de las Animas Perdidas" (River of Lost Souls), although this idea may indicate confusion with the Purgatoire River of southeastern Colorado.


Animas River Bridge
The Animas River from a foot bridge in Farmington

The Animas River rises high in San Juan Mountains of Colorado at the confluence of the West and North forks at the ghost town of Animas Forks and flows south past the ghost towns of Eureka and Howardsville. At Silverton, the river flows into the Animas Canyon. The Durango and Silverton Narrow gauge railroad follows the river through the canyon to Durango. From Durango the river flows south into New Mexico through the town of Aztec to its confluence with the San Juan River at Farmington. The only major tributary of the Animas River is the Florida River which confluences just north of the Colorado–New Mexico border.

A methane seep was reported on the river in Durango, Colorado in 2016.

Indigenous peoples

The ancestral Puebloan site of Aztec Ruins National Monument is situated along the river in the present day town of Aztec and for much of its course the river flows through native Ute and Navajo lands.

Wildlife and plants

The Animas serves as habitat to resident and migratory bald eagles which arrive in the winter months to take advantage of the ice-free river.

2015 contaminants spill

Animas River spill 2015-08-06
The Animas River between Silverton and Durango within 24 hours of the spill.

In August 2015, the La Plata County Sheriff's Office closed the river to the public after a crew working for the EPA released approximately 3 million gallons of mine waste into Cement Creek, a tributary of the Animas. The plug was accidentally removed while investigating a leak at the abandoned Gold King Mine. The mine was last active in the 1920s, but it had been leaking toxic water at a rate of 50 to 250 gallons a minute for years. The spill contained the toxic metals arsenic, cadmium, and lead, as well as the metals aluminum and copper. There may be other toxic heavy metals in the plume.

The spill changed the color of the river to orange, and the spill was described as "devastating" by Kim Stevens, the director of Environment Colorado, who said that businesses who rely on the river for profit might have to close down. The river's fish population might also be at risk due to the toxic waste that now runs through the river.

In February 2016, the Associated Press reported that the spill "dumped 880,000 pounds of metals" into the Animas River, and that "most of the metals settled into the riverbed." The metals considered are "cadmium, copper, lead, mercury, nickel, zinc, and possibly others."


Animas River coming out of Durango
Aerial view of the Animas River coming out of Durango
Animas River between Cedar Hill NM and CO border
The Animas River between Cedar Hill, New Mexico, and the Colorado border

The Animas river is a major white water rafting attraction accounting for 8.9% of Colorado's commercial rafting market while annually generating 45,411 commercial user days and direct expenditures of $5,207,033 (2011 est).

The Animas is a freestone fishery well populated with rainbow, brown, Colorado River cutthroat, and brook trout. It is considered a gold medal fishery above Rivera Bridge Crossing in Colorado. Recreational fishing with artificial lures and flies on the Animas is available year-round due to moderate winter weather. Insect hatches of aquatic diptera and mayflies occur in the winter and spring months. In late spring, summer and through fall the Animas sees caddisfly and mayfly hatches as well as terrestrials such as grasshoppers. Animas trout average 12 to 16 inches (30 to 41 cm). Larger trout in the 17 to 22 inches (43 to 56 cm) are occasionally caught by anglers. Brown trout as large as 36 inches (91 cm) have been caught in the Animas.

See also

Kids robot.svg In Spanish: Río de las Ánimas para niños

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