Logan Cave National Wildlife Refuge in Benton County

Benton County, Arkansas

Benton County is a county located in the U.S. state of Arkansas. As of the 2000 census, the population was 153,406. The U.S. Census Bureau 2010 population is 221,339. The county seat is Bentonville. Benton County was formed on 30 September 1836 and was named after Thomas Hart Benton, a U.S...

, Arkansas

Arkansas

Arkansas is a state located in the southern region of the United States. Its name is an Algonquian name of the Quapaw Indians. Arkansas shares borders with six states , and its eastern border is largely defined by the Mississippi River...

 became the 455th National Wildlife Refuge on March 14, 1989 under the Endangered Species Act

Endangered Species Act

The Endangered Species Act of 1973 is one of the dozens of United States environmental laws passed in the 1970s. Signed into law by President Richard Nixon on December 28, 1973, it was designed to protect critically imperiled species from extinction as a "consequence of economic growth and...

 of 1973. This 123 acre (0.49776378 km²) Ozark Mountain refuge, which includes a limestone

Limestone

Limestone is a sedimentary rock composed largely of the minerals calcite and aragonite, which are different crystal forms of calcium carbonate . Many limestones are composed from skeletal fragments of marine organisms such as coral or foraminifera....

-solution cave, is located 20 miles (32.2 km) west of Fayetteville, Arkansas

Fayetteville, Arkansas

Fayetteville is the county seat of Washington County, and the third largest city in Arkansas. The city is centrally located within the county and is home to the University of Arkansas. Fayetteville is also deep in the Boston Mountains, a subset of The Ozarks...

 and approximately 2 miles (3.2 km) north of U.S. Highway #412.

The Logan Cave area has a very diverse habitat which includes representatives of several Ozark Mountain types: oak

Oak

An oak is a tree or shrub in the genus Quercus , of which about 600 species exist. "Oak" may also appear in the names of species in related genera, notably Lithocarpus...

-hickory

Hickory

Trees in the genus Carya are commonly known as hickory, derived from the Powhatan language of Virginia. The genus includes 17–19 species of deciduous trees with pinnately compound leaves and big nuts...

 forest, grassland

Grassland

Grasslands are areas where the vegetation is dominated by grasses and other herbaceous plants . However, sedge and rush families can also be found. Grasslands occur naturally on all continents except Antarctica...

, shrubland

Shrubland

Shrubland, scrubland, scrub or brush is a plant community characterized by vegetation dominated by shrubs, often also including grasses, herbs, and geophytes. Shrubland may either occur naturally or be the result of human activity...

, floodplain

Floodplain

A floodplain, or flood plain, is a flat or nearly flat land adjacent a stream or river that stretches from the banks of its channel to the base of the enclosing valley walls and experiences flooding during periods of high discharge...

, marshland, bottomland hardwood

Hardwood

Hardwood is wood from angiosperm trees . It may also be used for those trees themselves: these are usually broad-leaved; in temperate and boreal latitudes they are mostly deciduous, but in tropics and subtropics mostly evergreen.Hardwood contrasts with softwood...

, upland deciduous

Deciduous

Deciduous means "falling off at maturity" or "tending to fall off", and is typically used in reference to trees or shrubs that lose their leaves seasonally, and to the shedding of other plant structures such as petals after flowering or fruit when ripe...

, and a small prairie

Prairie

Prairies are considered part of the temperate grasslands, savannas, and shrublands biome by ecologists, based on similar temperate climates, moderate rainfall, and grasses, herbs, and shrubs, rather than trees, as the dominant vegetation type...

. The ecology of the cave has been described as the highest quality cave habitat in the entire Ozark region. A spring-fed stream, with an average water flow of 5 million gallons/day, extends the entire length of the cave. This stream, fed by small springs that emanate from the cave, once supplied water to the Logan community, a fish hatchery

Hatchery

A hatchery is a facility where eggs are hatched under artificial conditions, especially those of fish or poultry. It may be used for ex-situ conservation purposes, i.e. to breed rare or endangered species under controlled conditions; alternatively, it may be for economic reasons A hatchery is a...

 and 49 fish ponds. Today, the spring forms a small stream which flows into the Osage Creek, a major tributary of the Illinois River

Illinois River

The Illinois River is a principal tributary of the Mississippi River, approximately long, in the State of Illinois. The river drains a large section of central Illinois, with a drainage basin of . This river was important among Native Americans and early French traders as the principal water route...

. Geological features of the cave distinctly exhibit how Ozark limestone-solution caves are formed. Many fossil

Fossil

Fossils are the preserved remains or traces of animals , plants, and other organisms from the remote past...

 marine species are present in the cave, evidence that the region was once covered by an ocean. Extensive deposits of fine alluvial clay

Clay

Clay is a general term including many combinations of one or more clay minerals with traces of metal oxides and organic matter. Geologic clay deposits are mostly composed of phyllosilicate minerals containing variable amounts of water trapped in the mineral structure.- Formation :Clay minerals...

s of homogenous texture border the stream in some areas.

The primary objectives of Logan Cave NWR are to properly administer, preserve, and develop the tract for protection of a unique cave ecosystem that provides essential habitat for the endangered gray bat

Gray Bat

Myotis grisescens once flourished in caves all over the southeastern United States, but due to human disturbance, Gray Bat populations declined severely during the early and mid portion of the 20th century. At one cave alone, the Georgetown Cave in Northwestern Alabama, populations declined from...

, endangered Ozark cave crayfish, the threatened Ozark cavefish

Ozark Cavefish

The Ozark cavefish, Amblyopsis rosae, is a small subterranean freshwater fish native to the United States. It has been listed as a threatened species in the United States since 1984, the IUCN lists the species as vulnerable. While the Ozark cavefish is listed as threatened by the U.S...

, and other significant cavedwelling wildlife species. Gray bats use the cave in the spring and summer as a maternity site and the Ozark cave crayfish is known only to exist in Logan Cave and one other site.