Onda, Arkansas

SEFOR (Southwest Experimental Fast Oxide Reactor) was an experimental fast breeder reactor located in Cove Creek Township, Washington County, near Strickler, in northwest Arkansas (20 miles southwest of Fayetteville, Arkansas). The site consisted of a 20-Megawatt (thermal), Sodium-Cooled Test Reactor, a Shop Building, an Operations Building, a Maintenance Shed, and an Electrical Transformer yard. It operated from 1969 to 1972 when the program ended. It was then acquired by the University of Arkansas, in hopes that it could be used as a research facility in 1975, but it never happened. The University maintained the decommissioned site until finally receiving federal funds to dismantle the facility in 2016, which completed in 2019. It used MOX fuel and liquid sodium cooling, and generated 20MW of heat but no electricity. It was constructed particularly to test the suggested inherent safety features of the oxide fuel/sodium cooling configuration, and in particular the effect on the core of thermal expansion, including in an accident situation. The belief that this would stabilize the core was confirmed. The design concept of using thermal expansion to stabilize a reactor core has since been featured in other reactor designs, notably in the pebble bed reactor, which is however neither a fast neutron reactor nor a breeder reactor, and in subsequent Fast breeder reactors. SEFOR operated from 1969 to 1972, when the original program was completed as planned. It was privately operated by General Electric and funded by the United States government through the Southwest Atomic Energy Associates, a nonprofit consortium formed by 17 power companies of the Southwest Power Pool and European nuclear agencies. A proposal for funding to extend its operation to 1977 was rejected prior to the closure in 1972. The fuel and irradiated sodium coolant were removed and taken offsite later in 1972, and the facility was placed in safe storage. The reactor was acquired by the University of Arkansas in 1975, and was used to calibrate equipment and as a research tool for graduate students. SEFOR was designated a Nuclear Historic Landmark site in October 1986, and that same year the university stopped using the facility but continued to maintain surveillance through maintenance activities and periodic visits to the reactor. A caretaker also lived on site in the former Visitors’ Center.

Hubbard (formerly Hubard) is an unincorporated community in Valley Township, Washington County, Arkansas, United States. It is located near the intersection of Washington County Road 21 and Hubbard Road.A post office called Hubard was established in 1888, and remained in operation until 1907.

Hogeye is an unincorporated community in Valley Township, Washington County, Arkansas, United States. It is located on Arkansas Highway 265 and Arkansas Highway 156.Hogeye was said to be "no bigger than a hog's eye", hence the name.The Hogeye Marathon initially ran from Fayetteville to Hogeye, but the marathon now runs in Springdale.

Lee's Creek Township is one of thirty-seven townships in Washington County, Arkansas, USA. As of the 2000 census, its total population was 640. Lee's Creek Township was established in 1880.

Hickory Creek is a tributary of the Illinois River in Washington County, Arkansas, in the United States. Its GNIS I.D. number is 50050.

Earle House is a house in Canehill, Arkansas on Highway 45 built in 1859 to house Dr. Fountain R. Earle, the president of Cane Hill College. The property was added to the National Register of Historic Places along with many other Canehill properties in November 1982. The house, set well back from the highway, is a single-story wood-frame structure, with a side gable roof and a projecting gable-roof section on the front (western) facade. This projection has box columns supporting a delicate frieze and box cornice, with a raking cornice joining it to form a pediment. Chimneys are located at the gable ends.

The Southern Mercantile Building is a historic commercial building at 107 East Buchanan in Prairie Grove, Arkansas. It is a single-story brick and masonry structure, with a stuccoed parapet. It consists of two separate buildings, one dating to 1883, that were combined under the unifying parapet about 1920. The building is the largest and best-preserved example of that period's commercial architecture in the city. It served for many years as Prairie Grove's largest and most important general store, finally closing its doors in 1987.The buildings was listed on the National Register of Historic Places in 1990.

The Prairie Grove Commercial Historic District encompasses part of the historic commercial downtown area of Prairie Grove, Arkansas. It extends for about 1-1/2 blocks on the south side of East Buchanan Street, from Mock Street to an alley east of Neal Street. The buildings on this side of the street more mostly built in the late 19th and early 20th centuries, and are good examples of brick and stone commercial architecture of the period. The district also includes a small portion of Mock Park, and two buildings constructed in the 1960s.The district was listed on the National Register of Historic Places in 2018.

The William Welch House is a historic house on Main Street in Canehill, Arkansas. It is a 1+1⁄2-story wood-frame structure, with a side-gable roof, chimneys at the sides, and additions to the rear giving it a rough T shape. A gable-roofed portico shelters the entrance, which is centered in the main three-bay facade. The portico's gable, along with the house's gable ends and roofline, have been decorated with scalloped woodwork, probably added in the 1870s. The house itself was probably built in the 1850s, and is one of Canehill's few antebellum houses, offering a distinctive combination of vernacular Greek Revival and later Victorian stylistic touches.The house was listed on the National Register of Historic Places in 1982.

The Zeb Edmiston House is a historic house in Cane Hill, Arkansas. It is a single-story wood-frame structure, with a side gable roof, weatherboard siding, and a stone foundation. An ell extends to the rear from the center, and a gable-roofed portico extends over the front entry, supported by decorative classically inspired posts mounted on paneled pedestals. The house, built in 1872, harkened back to the Greek Revival which was popular before the American Civil War. It was built by a local businessman from the prominent Edmiston family.The house was listed on the National Register of Historic Places in 1982. It was purchased by Historic Cane Hill, Inc., a non-profit seeking to restore historic and cultural sites in Cane Hill, in July 2015. The property has since been restored. It has historically been subject to inundation by Jordan Creek, which crosses the back of the property, during major rain events. The entire property is located within the 100-year floodplain, according to the Federal Emergency Management Agency.

The North Mock Street Historic District encompasses a pair of commercial industrial buildings at 112 and 116 North Mock Street in Prairie Grove, Arkansas. The B.F. Carl Building, at 116 North Mock, was built in 1904, and originally served as a furniture and casket maker's store. The B.H. Harrison Masonic Temple, at 112 North Mock, was built in 1903, and has served as the home to the local Masonic lodge since. The two buildings are well-preserved examples of early 20th-century commercial architecture, featuring pressed metal storefronts with Classical features.The district was listed on the National Register of Historic Places in 2018.

The Methodist Manse is a historic house at Spring and Main Streets in Canehill, Arkansas. Built in 1834, this single-story brick structure served as the town's first Methodist church building, and was converted to its minister's house when the new wood-frame church was built in the 1850s. It is one of the community's most significant pre-Civil War buildings.The house was listed on the National Register of Historic Places in 1982.