This building was constructed in 1918 by Albert Majors and Benjamin Mueller to house

 the Casper Auto Company, an auto showroom and garage run by B. B. Lummis. The building represents elements of the Mission/Spanish Colonial Revival architectural style. The Natrona/Casper Motor Company building represents one of the earliest and largest car dealerships in Casper and Wyoming. It operated continuously as a car dealership and garage from 1918 to 1970, serving the Casper community and the surrounding region. It is important for its contribution to the commerce of the city and the region. The building is also important for its architecture which reflects the economic optimism and affluence brought about by the regional oil boom of the late 1910s and 1920s. The building facade still retains elements of the Mission/Spanish Colonial Revival architectural style that was in vogue throughout America during this time period. It was also among the first buildings in Casper to be constructed using poured concrete walls.

The North Casper Clubhouse was constructed in 1938-1939 by the North Casper Improvement Association, a local organization composed of interested neighborhood citizens. The clubhouse was built by utilizing labor provided by the National Youth Administration, an agency of the Works Progress Administration, which was a major component of the Roosevelt Administration's New Deal program. The building was designed by the prominent Casper architectural firm of Goodrich and Krusmark. It is a one-story rammed earth building that represents the Pueblo Revival style. Rammed earth construction is an old European building practice utilized by German-Russians on the high plains of North Dakota in the 1880s, and advocated by many federal government agencies as a low cost and durable building technique during the Depression era. It is one of only a few examples of rammed earth construction identified in Wyoming. The building has been used continuously as an important community center where meals are served to senior citizens, church services are held, and wedding receptions are held. The North Casper Clubhouse represents an example of community organization and cooperation in the face of the Great Depression.

The Odd Fellows Building in Casper was completed in 1952 and is an important component of the post-World War II building boom in downtown Casper. At that time the city was developing into a major commercial center in the area. Designed by prominent local firm Goodrich & Wilking, the building is representative of the restrained version of the Modern style of architecture that was becoming increasingly common in Casper in the 1950s. Construction of the building also signaled a renewed interest in fraternal lodges. During the 1950s numerous fraternal organizations built new or expanded their existing lodges. The building was used by the Odd Fellows for over fifty years until 2007 when the lodge disbanded.

The Ohio Oil Company Building, constructed in two stages in 1948-1949 and 1955-1956, displays several basic elements of the Art Deco style of architecture. The building was designed by the architectural firm of Wilbur Watson Associates of Cleveland, Ohio and was constructed to house the division headquarters of the Ohio Oil Company, which became known as the Marathon Oil Company in 1962.

The Pathfinder Dam, is a masonry arch dam which completely blocks, from bedrock to canyon rim, the course of the North Platte River. Construction of the dam was completed in 1909. Fashioned from huge blocks of granite, quarried nearby from the same formation into which the river had trenched its canyon course, the dam stands 214 feet high, has a crest length which reaches to 432 feet, and tapers from a base 97 feet wide to a top which is no more than 11 feet in width. The building of Pathfinder Dam was a successful testing of the late nineteenth century concept of arid lands reclamation in the western United States. The reservoir basin had a shore line greater than 75 miles in extent and afforded opportunity for storage of more than one million acre feet of irrigation and industrial water to previously arid lands.

The Pathfinder Dam Historic District consists of various features associated with the construction and ongoing operation of the dam, including the spillway, emergency gatehouse, cableway powerhouse, dike, dam tender’s house and barn, and a quarry. In 1904 the location of the Pathfinder Dam was selected as part of the North Platte Project to allow the irrigation development of eastern Wyoming and western Nebraska. Today the North Platte Project provides full service irrigation for about 226,000 acres and supplemental irrigation service for an additional 109,000 acres. Pathfinder Dam is also notable as it served as a field laboratory to test a new dam design methodology called the Trial Load Method of analysis developed by the Reclamation Service and engineer George Wisner.

The Powder River Train Station was constructed in 1910 by employees of the Chicago and Northwestern (C&NW) Railroad in the small rural community of Powder River. The Station is representative of the primary influence of the C&NW in the settlement of central Wyoming. It was the first railroad in the area and provided accessible shipping points for a new and growing sheep industry, induced homesteaders to settle along its line, brought new towns to central Wyoming, and carried goods to the growing settlements at its stations. The Powder River Station was the focal point of commerce in Powder River and served as the post office and telegraph office as well as the passenger and freight depot.

The Rialto Theater is a prominent commercial brick structure located in downtown Casper. The building, originally constructed as the New Lyric Theater in 1921, illustrates the amount of capital that could be invested in a recreational structure in a thriving Wyoming city. The design of the Rialto is typical of a 1920s commercial-style motion picture theater located in a small but prosperous city. In 1921 an entrepreneur by the name of Henry Brennan constructed the movie house based on his successful vaudeville theater located in the west-center of town. Brennan's new theater, named the New Lyric, was unsuccessful reputedly because the new location failed to attract Brennan's old clientele, patrons of the local saloons. The theater was sold to new owners and remodeled in 1922. When the Rialto Theater opened its doors in 1922 to show silent movies, it had lots of competition from the six other theaters that also served the City of Casper. The Rialto soon became the premier movie house in Casper with an elaborate exterior and first-run movies accompanied by a women's orchestra. The Rialto is significant because of the important role the theater played in the city's recreation and entertainment industry. Its association with the growth and development of Casper, through the city's boom and bust history, illustrates the role recreation and culture played in Casper.

Roosevelt School, originally named North Casper School, was designed by the state-renowned firm of Garbutt, Weidner and Sweeney of Casper in 1921. The school building brings together elements of state-of-the-art architecture and social change to form a unique time piece in Casper's history. Smaller and stylistically overshadowed by the daunting Natrona County High School, which was designed by the same firm and constructed within a few years of Roosevelt School, this building was produced by the same forces of economic growth and community service. The school was built in 1922 and added to in 1924. It had its origins in the dramatic expansion of the population of Casper during the petroleum boom of the immediate post-World War I period in which the student population increased by 700%. In particular, it served as the neighborhood center of a part of town that suffered neglect and privation, and that was characterized by constant turnover and a transient population. It is significant because of its direct association with the growth of education in Casper.

The site complex at South Cedar Gap is a multi-component prehistoric archaeological site group composed of at least six discrete clusters of stone circles (tipi rings), several cairn and cobble alignments, including a linear ''trail'', and a buried level of burned and fragmentary bone, lithics and carbonized organic debris. A Late Plains Archaic projectile point and a Late Prehistoric projectile point have been recovered from the surface. No other components have been verified. The location of the site is in the eastern structural fringe of the Wind River Basin, along a seasonal tributary of Alkali Creek, an upper tributary of the Wind River in the southern foothills of the Bighorn Mountains. The South Cedar Gap site complex is an extremely rich site containing important archaeological data on aboriginal settlement and subsistence in the upper Wind River Basin and the Middle Rocky Mountains in general.

National Register form available upon request.

The South Wolcott Street Historic District is among Casper's oldest neighborhoods and was the preferred area to live for the city's early prominent citizens. It is located immediately to the south of the downtown toward the base of Casper Mountain. The earliest houses in the district date to 1905 while the majority were built between 1910 and 1924 in association with Casper's first energy boom. The district is a visually cohesive neighborhood exhibiting a high degree of architectural integrity. It is made up almost entirely of single family homes with uniform setbacks displaying the design and workmanship of the era. Other features such as the wide tree lined streets and an occasional hitching post ring at the curb also contribute to the historical fabric of the district. Houses in the district include excellent examples of Colonial Revival and Tudor Revival, both of which were popular during the early years of the twentieth century. The district also has representatives of the Bungalow/Craftsman, and American Foursquare styles, as well as a few examples of Prairie style. The South Wolcott Street Historic District is significant for its associations with the development of Casper, both initially as a regional stock raising center, and later as the center of oil exploitation activities in the state. It is also significant because it represents several of Wyoming's political and civic leaders. These include Governor Bryant B. Brooks, and United States Senator Patrick Sullivan, both of whom were long time residents in the district. In addition, the district was platted by Governor Joseph M. Carey, who had earlier served as Wyoming's first United States Senator.

The historic significance of the geologic developments leading to the formation of the Sweetwater River Valley is that they produced a break in the Rocky Mountain chain. That break became an important part of a major central east-west overland route that extended from the Missouri River to and through the Rocky Mountains. Along that route--the Oregon Trail--fur trappers, goldseekers, homeseekers, merchants and troopers rode horseback or in wagons, walked, or pulled and pushed handcarts during the century that lasted from 1812 to 1912. The former date is the year the Astorians under Robert Stuart followed the trail from west to east on their journey from the mouth of the Columbia River. The latter year is said to be the one in which the last wagon train passed over the trail. There were at least three prominent landmarks along the trail. At the eastern end of the Sweetwater Valley was Independence Rock, a large protruding granite mass. The rock was a midway point in the journeys of those bound for the West Coast. Five miles west of Independence Rock is a second Sweetwater landmark, Devils Gate. Fifteen miles upriver from Devils Gate is Split Rock, the last of the three granite landmarks along the Sweetwater. To some, such as pioneer photographer W. H. Jackson, its summit was not a split rock but was seen as ''Twin Peaks''. For a day or two following their passing of Split Rock, emigrants could look backward at the V-shaped notch as they moved up the Sweetwater Valley toward South Pass. At the base of the pass the Sweetwater country was left behind and the emigrants crossed the Continental Divide, moving into the Pacific watershed and entering the long-anticipated Oregon Country.

Located on the plains west of Casper, the Stone Ranch Stage Station was constructed sometime around 1890. The stage station is a representative structure from a short era in Wyoming's transportation history when stage, freight and mail lines carried supplies and passengers from the terminus of a railway line to communities not yet serviced by a railroad. By the late 1880s the Wyoming Central Railroad had laid rails from Nebraska into Wyoming reaching Lusk, Douglas, Glenrock, and Casper. The movement of freight, supplies and passengers from the Casper terminus to Lander, however, depended upon privately owned and operated stage routes. The first stop on the route was at Stone Ranch. The station operated from 1897 to 1902 under the guidance of John (Jack) Clark as one of several stops operated by the Clark family. In 1902 the Utah-Nevada Express Company signed a four year contract to operate the stage line from Casper to Lander and Fort Washakie. Within six months this company failed and the U.S. Fidelity and Guaranty Company of Baltimore, bondsmen, took over the operation of the stage line. Steward and Joe Nails were sent to take charge and continued in that task until the railroad reached Lander in October 1906. The completion of the railway brought many new settlers to central Wyoming. Stock raising ventures prospered with the arrival of a reliable method of transporting sheep and cattle to markets. However, stage freight lines could not compete with railroads and routes adjacent to the railway line ceased to be corridors of commerce. Most of the stage stations closed including the station at Stone Ranch. The structure became part of the building complex at the ranch and served in many adaptive use capacities.

Teapot Dome is an historic site of national significance over which developed a scandal of national proportions, involving California as well as Wyoming oil fields and involving high officials of the United States government and private enterprise. However, the dome itself is less visible than the rock for which it was named. Therefore, the nomination to the National Register of Historic Places pertains to the rock which is a visible symbol or reminder of that famous American scandal. Teapot Rock is an eroded sandstone formation located about 25 miles north of the city of Casper in the southwestern Powder River Basin. The formation which once looked like a teapot has given its name to a number of natural and man-made features of the surrounding landscape including a creek, townsite, oil development company, and one of the most famous oil fields in American history. About six miles east of the rock is the southern boundary of the Teapot Dome Naval Oil Reserve; 9,481 acres of land set aside in 1915 by presidential executive order as United States Naval Oil Reserve Number Three.

The Tom Sun Ranch, established in the early 1870s in the Sweetwater Valley of central Wyoming, dates to the period of the range cattle industry on the Plains. The Cheyenne Daily Leader remarked in 1882 that ''the eastern person of inquiring turn of mind who writes to his friends out west to ask what a ranch is like would find his answer in a description of Tom Sun's.'' Tom Sun was a frontiersman who became a pioneer cattleman. A French Canadian, who had been a mountain man and knew the Wyoming country thoroughly from his trapping days, Sun was higly respected in Wyoming. He was known for his integrity as well as for his ability to use a gun. The site of the ranch is both historic and scenic, for Sun chose his range on the Oregon Trail, along the Sweetwater River near Devils Gate and Independence Rock, notable landmarks on the famous overland trail.

The Townsend Hotel is a five story structure at the core of the Casper business district important both for its historic association with the oil industry and for its unique architectural character. Since its construction in 1923, the Townsend has been a focal point in the business district and a hub of social and political life in Casper. The concrete structure, along with brick and cast stone facade, and marble, ornate brass and plaster moldings is a rare example of the technology, craftsmanship and architectural expression of the period. In 1923 Charles H. Townsend, an original Casper pioneer, banker and businessman, contracted Barbutt, Weidner and Sweeney architects to design the hotel with the finest dining, meeting and dancing facilities in the area. Its construction was directly related to energy exploitation, which has long been a significant contributor to the broad patterns of Wyoming and United States economic and political history. The Townsend was Casper's favorite place for concerts by popular local artists, gala dances, fine dining, service club meetings, and political rallies. It was also a base operation for visiting journalists and dignitaries, and was used by the commissioned officers and USO during World War II.

The Tribune Building was constructed in 1920 by J. E. Hanway for the Casper Tribune. The three-story brick building represents the Italian Renaissance Revival style of architecture. It is one of the most important buildings in the central business district of Casper because of the role it played in communications and commerce as a continuously operating newspaper facility for over forty years. The Tribune Building housed Casper's major newspaper from 1920 to 1963. The newspaper served as the major source of daily local, regional, and national news for the community until the gradual dominance of television in the 1950s and 1960s. It was also an important source of advertising and promotion of local and regional business and industry.

The Turner-Cottman Building is an important retail and office building that represents the physical and commercial growth of downtown Casper. The building was designed by famed Wyoming architect Leon Goodrich in 1924 for Fred Cottman and Adah Turner-Cottman during a time of growth and expansion of Casper. The Cottmans achieved status in the area for developing a large sheep raising operation in the county. At the time of the building’s construction, Casper was rapidly growing due to expansion of the sheep industry and the rapid exploration and development of nearby oil fields. Casper became a center for shipping and oil field activities.