animas river type of water body
in the northwestern part of the Silverton caldera, the Eureka district in the Eureka graben (Boulder: University Press of Colorado, 2013). The Animas is a freestone fishery well populated with rainbow, brown, Colorado River cutthroat, and brook trout. Following the signing of a treaty with the Ute Aquatic wildlife has been and will continue to be tested for quite some time to assess the safety of eating fish from the river’s contaminated reaches. discovered in 1881. The and mineralized by Miocene hydrothermal activity. 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. closed. Elevations range from The Animas River within and immediately below Durango is well known as a trout fishery. Rob Blair and George Bracksieck, eds., The Eastern San Juan Mountains: Their Geology, Ecology, and Human History (Boulder: University Press of Colorado, 2011). in the basin is the city of Durango, Colo. Miners disposed of the mine tailings, a fine gray mineral powder suspended in water, by discharging the refuse into the nearest stream. (Boulder: University Press of Colorado, 2011). within the Silverton caldera, and the South Silverton district along the southern margin of the also several porphyry molybdenum deposits discovered by drilling in the Mineral Creek area A Colorado State Historical Fund grant to San Juan County, in cooperation with the Bureau of Land Management, provided for stabilization of the remaining structures in 1997 and 1998. Rob Blair (Boulder: University Press of Colorado, 1996) and Tom Cech, “The Animas River Tragedy” (Boulder: University Press of Colorado, 2015). In figure 2, plots of the geochemical From the river’s origin to Baker’s Bridge, north of Durango, the gradient of the Animas varies from steep to moderate. Thompson, Jonathan. These reactions start in the ore deposits and continue within the streams that drain them. In the upper Animas watershed, acidic runoff containing toxic levels of heavy metals comes from several sources. Despite poor water quality in its upper reaches, throughout much of its length the Animas River is a beautiful and ecologically productive stream. the occurrence of placer gold upstream. Thus, the Animas River is a precious resource worthy of protection and improvement through conservation and pollution control. In the Silverton area and northward extensive amounts of pulverized mine tailings and exposed ore deposits leach sulfides of iron, copper, antimony, arsenic, and zinc into the groundwater and the greater Animas watershed. The mineral-rich geology of the San Juan Mountains profoundly shaped the natural and human histories of the Animas watershed. 1976). The Animas River immediately turned orange as the contaminated water devastated one of this region’s most important watersheds. On August 5, 2015, the toxic legacy of mining in the San Juans revisited the Animas River when the US Environmental Protection Agency (EPA) inadvertently released more than 3 million gallons of water that had been trapped in an abandoned mine. Carl Abbott, Stephen J. Leonard, and Thomas J. Noel, Colorado: A History of the Centennial State, 5th ed. Encyclopedia Staff, adapted from Preston Somers and Lisa Floyd-Hanna, “Wetlands, Riparian Habitats, and Rivers,” in The Western San Juan Mountains: Their Geology, Ecology, and Human History, ed. The Animas bears the San Juan’s legacy of mining to this day. The water flow for the Animas River to be considered in a flood stage is about 10,500 cfs, Knowlton said. The Durango Pumping Plant, completed in 2011, as part of the Animas-La Plata Water Project, draws an average annual of 57,100 acre-feet from the river, for storage in Lake Nighthorse. The town of Silverton,at an elevation of 9,318 feet along the Animas River, is the county seat and only incorporated town in San Juan County. Mining activities exposed large amounts of ore deposits in several ways. Water quality deteriorates markedly below Silverton because two tributaries, Mineral Creek and Cement Creek, enter the Animas in this area. The 2015 Gold King Mine waste water spill was an environmental disaster that began at the Gold King Mine near Silverton, Colorado, when Environmental Protection Agency (EPA) personnel, along with workers for Environmental Restoration LLC (a Missouri company under EPA contract to mitigate pollutants from the closed mine), caused the release of toxic waste water into the Animas River … Location of the mouth of the Animas River in New Mexico, Durango and Silverton Narrow gauge railroad, List of tributaries of the Colorado River, "Durango's Animas River is not one of lost souls", "Geologist: Coal outcrops cause methane hot spot", "Animas La Plata Project Implementation of the Colorado Ute Settlement Act Amendments of 2000", "The toxic Colorado river spill and the menace of old hard-rock mines", "Regional EPA director calls wastewater spill in Animas River 'tragic, "Pollution flowing faster than facts in EPA spill", http://www.denverpost.com/news/ci_29481905/epa-mine-spill-dumped-880-000-pounds-metals?source=pkg, "Commercial River Use in the State of Colorado 1988-2011", Denver-Aurora-Lakewood, CO Metropolitan Statistical Area, http://www.hcn.org/articles/when-our-river-turned-orange-animas-river-spill, https://en.wikipedia.org/w/index.php?title=Animas_River&oldid=978129989, Tributaries of the Colorado River in Colorado, Tributaries of the Colorado River in New Mexico, Creative Commons Attribution-ShareAlike License, Confluence of North Fork Animas River and West Fork Animas River.
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